subject:(Hydrogen as fuel)

Nelson Mandela Metropolitan University

1. [No author]. Scoping of a commercial micro reformer for the production of hydrogen.

Degree: Faculty of Science, 2016, Nelson Mandela Metropolitan University

► Hydrogen has gained interest as fuel recently as the harmful effects of fossil fuels on the environment can no longer be ignored. Hydrogen, which produces… (more)

▼ Hydrogen has gained interest as fuel recently as the harmful effects of fossil fuels on the environment can no longer be ignored. Hydrogen, which produces no pollutants, forms the feed for cleaner fuel cells systems currently in use. Fuel cells, although not as economically viable as fossil fuels, have found a foothold in the energy market in various markets like power backup and use in remote locations. Production of hydrogen is still largely done via fossil fuel reforming and this technology has received renewed interest for use with fuel cells in the form of micro- reformers or fuel processors. This study entailed the performance benchmarking of a so called Best-in-Class commercial micro reformer (as available in 2010), the 1 kW WS FLOX Reformer, and was undertaken under the auspices of the national HySA programme. The study’s focus was primarily on reformate output quality (carbon monoxide concentration), and start up time, thermal efficiency and hydrogen output (15 SCLM). The reformer consisted of a combustion section encased in an outer reforming section consisting of three reactors in series, steam reforming, water gas shift and selective methanation. As-provided temperature control is simplified though the use of only one temperature setpoint in the combustion chamber and temperature control in the CO clean up stages obtained through means of heat transfer with incoming water being evaporated. Combustion takes place through flame combustion or by means of the supplier’s patented FLOX (flameless oxidation) combustion. The purchased FLOX Reformer assembly was integrated into a fully automated unit with all balance of plant components as well as microGC and flue gas analysis for measurement of outlet conditions. The FLOX Reformer was tested at multiple combustion temperatures, combustion flowrates, reforming loads and steam-to-carbon ratios to obtain a wide set of benchmark data. From the testing it was found that the reformer was able to produce the necessary 15 SCLM hydrogen with a carbon monoxide purity of less than 10 ppm as required in fuel cells for all testing if the reaction temperatures were within the recommended limits. Intermediary water gas shift analysis showed methane and carbon monoxide conversion in the reforming and water gas shift stages to be identical to thermodynamic equilibrium conversion – 95% and higher for all temperatures. iii Selective methanation conversion obtained was 99%, but not always at equilibrium conversion due to increased selective methanation temperatures, where carbon dioxide methanation was also observed at the higher temperatures. Temperature control through heat exchange with incoming water in the CO removal stages was found to be less than ideal as the temperature inside these stages fluctuated dramatically due to inaccuracies in the water pump and a lagged response to flowrate changes. Startup times of less than an hour was observed for multiple combustion flowrates and the reformer boasts a standby function to reduce this to less than half an hour. The thermal…

Subjects/Keywords: Hydrogen as fuel; Fuel processors

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

author], [. (2016). Scoping of a commercial micro reformer for the production of hydrogen. (Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/8175

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

author], [No. “Scoping of a commercial micro reformer for the production of hydrogen.” 2016. Thesis, Nelson Mandela Metropolitan University. Accessed April 14, 2021. http://hdl.handle.net/10948/8175.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

author], [No. “Scoping of a commercial micro reformer for the production of hydrogen.” 2016. Web. 14 Apr 2021.

Vancouver:

author] [. Scoping of a commercial micro reformer for the production of hydrogen. [Internet] [Thesis]. Nelson Mandela Metropolitan University; 2016. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10948/8175.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. Scoping of a commercial micro reformer for the production of hydrogen. [Thesis]. Nelson Mandela Metropolitan University; 2016. Available from: http://hdl.handle.net/10948/8175

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Hong Kong University of Science and Technology

2. Lam, Kwun Yu MAE. Perovskite oxides as oxygen catalysts.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-93020 ; https://doi.org/10.14711/thesis-991012565053103412 ; http://repository.ust.hk/ir/bitstream/1783.1-93020/1/th_redirect.html

► Renewable energy resources will play a big role in the future of humanity because of global warming and environmental pollution. However, renewable energy needs to… (more)

Subjects/Keywords: Hydrogen as fuel ; Electrocatalysis ; Electrochemistry

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lam, K. Y. M. (2017). Perovskite oxides as oxygen catalysts. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-93020 ; https://doi.org/10.14711/thesis-991012565053103412 ; http://repository.ust.hk/ir/bitstream/1783.1-93020/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lam, Kwun Yu MAE. “Perovskite oxides as oxygen catalysts.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed April 14, 2021. http://repository.ust.hk/ir/Record/1783.1-93020 ; https://doi.org/10.14711/thesis-991012565053103412 ; http://repository.ust.hk/ir/bitstream/1783.1-93020/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lam, Kwun Yu MAE. “Perovskite oxides as oxygen catalysts.” 2017. Web. 14 Apr 2021.

Vancouver:

Lam KYM. Perovskite oxides as oxygen catalysts. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2021 Apr 14]. Available from: http://repository.ust.hk/ir/Record/1783.1-93020 ; https://doi.org/10.14711/thesis-991012565053103412 ; http://repository.ust.hk/ir/bitstream/1783.1-93020/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lam KYM. Perovskite oxides as oxygen catalysts. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-93020 ; https://doi.org/10.14711/thesis-991012565053103412 ; http://repository.ust.hk/ir/bitstream/1783.1-93020/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Rutgers University

3. Rehn, Steven. Flammability of hydrogen at sub-atmospheric pressures and reduced oxygen concentrations.

Degree: MS, Mechanical and Aerospace Engineering, 2014, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/45418/

► Prototypes aircraft are currently being built and tested that rely on hydrogen fuel cells to provide power for their electrical demands, and some even use… (more)

Subjects/Keywords: Hydrogen – Thermal properties; Combustion; Hydrogen as fuel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rehn, S. (2014). Flammability of hydrogen at sub-atmospheric pressures and reduced oxygen concentrations. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/45418/

Chicago Manual of Style (16^th Edition):

Rehn, Steven. “Flammability of hydrogen at sub-atmospheric pressures and reduced oxygen concentrations.” 2014. Masters Thesis, Rutgers University. Accessed April 14, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/45418/.

MLA Handbook (7^th Edition):

Rehn, Steven. “Flammability of hydrogen at sub-atmospheric pressures and reduced oxygen concentrations.” 2014. Web. 14 Apr 2021.

Vancouver:

Rehn S. Flammability of hydrogen at sub-atmospheric pressures and reduced oxygen concentrations. [Internet] [Masters thesis]. Rutgers University; 2014. [cited 2021 Apr 14]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/45418/.

Council of Science Editors:

Rehn S. Flammability of hydrogen at sub-atmospheric pressures and reduced oxygen concentrations. [Masters Thesis]. Rutgers University; 2014. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/45418/

4. Nuttaporn Choodum. A Study of the Optimized Conditions for a Closed-loop HHO Production System Using A/C Power Supply .

Degree: คณะวิศวกรรมศาสตร์ ภาควิชาวิศวกรรมเคมี, 2017, Prince of Songkla University

URL: http://kb.psu.ac.th/psukb/handle/2016/11384

Subjects/Keywords: Hydrogen as fuel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Choodum, N. (2017). A Study of the Optimized Conditions for a Closed-loop HHO Production System Using A/C Power Supply . (Thesis). Prince of Songkla University. Retrieved from http://kb.psu.ac.th/psukb/handle/2016/11384

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Choodum, Nuttaporn. “A Study of the Optimized Conditions for a Closed-loop HHO Production System Using A/C Power Supply .” 2017. Thesis, Prince of Songkla University. Accessed April 14, 2021. http://kb.psu.ac.th/psukb/handle/2016/11384.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Choodum, Nuttaporn. “A Study of the Optimized Conditions for a Closed-loop HHO Production System Using A/C Power Supply .” 2017. Web. 14 Apr 2021.

Vancouver:

Choodum N. A Study of the Optimized Conditions for a Closed-loop HHO Production System Using A/C Power Supply . [Internet] [Thesis]. Prince of Songkla University; 2017. [cited 2021 Apr 14]. Available from: http://kb.psu.ac.th/psukb/handle/2016/11384.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Choodum N. A Study of the Optimized Conditions for a Closed-loop HHO Production System Using A/C Power Supply . [Thesis]. Prince of Songkla University; 2017. Available from: http://kb.psu.ac.th/psukb/handle/2016/11384

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Missouri – Columbia

5. Schaeperkoetter, Joseph. Structural and chemical characterization of modified graphenes for hydrogen storage.

Degree: 2018, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/68939

► The automotive industry is already showing signs of moving beyond a century long dependence on petroleum. The tens of billions of dollars in the electric… (more)

Subjects/Keywords: Hydrogen as fuel – Research; Transportation, Automotive – Research

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Schaeperkoetter, J. (2018). Structural and chemical characterization of modified graphenes for hydrogen storage. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/68939

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schaeperkoetter, Joseph. “Structural and chemical characterization of modified graphenes for hydrogen storage.” 2018. Thesis, University of Missouri – Columbia. Accessed April 14, 2021. http://hdl.handle.net/10355/68939.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schaeperkoetter, Joseph. “Structural and chemical characterization of modified graphenes for hydrogen storage.” 2018. Web. 14 Apr 2021.

Vancouver:

Schaeperkoetter J. Structural and chemical characterization of modified graphenes for hydrogen storage. [Internet] [Thesis]. University of Missouri – Columbia; 2018. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10355/68939.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schaeperkoetter J. Structural and chemical characterization of modified graphenes for hydrogen storage. [Thesis]. University of Missouri – Columbia; 2018. Available from: http://hdl.handle.net/10355/68939

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cape Peninsula University of Technology

6. Baloyi, Liberty Ntshuxeko. The production of hydrogen from the water gas shift reaction through the use of a palladium-silver membrane reactor .

Degree: 2016, Cape Peninsula University of Technology

URL: http://etd.cput.ac.za/handle/20.500.11838/2470

► The Water Gas Shift (WGS) reaction describes the reaction between carbon monoxide and water vapour to produce carbon monoxide and hydrogen. This work describes the… (more)

Subjects/Keywords: Water-gas – Reactivity; Hydrogen as fuel; Silver-palladium alloys – Hydrogen content

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Baloyi, L. N. (2016). The production of hydrogen from the water gas shift reaction through the use of a palladium-silver membrane reactor . (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2470

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Baloyi, Liberty Ntshuxeko. “The production of hydrogen from the water gas shift reaction through the use of a palladium-silver membrane reactor .” 2016. Thesis, Cape Peninsula University of Technology. Accessed April 14, 2021. http://etd.cput.ac.za/handle/20.500.11838/2470.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Baloyi, Liberty Ntshuxeko. “The production of hydrogen from the water gas shift reaction through the use of a palladium-silver membrane reactor .” 2016. Web. 14 Apr 2021.

Vancouver:

Baloyi LN. The production of hydrogen from the water gas shift reaction through the use of a palladium-silver membrane reactor . [Internet] [Thesis]. Cape Peninsula University of Technology; 2016. [cited 2021 Apr 14]. Available from: http://etd.cput.ac.za/handle/20.500.11838/2470.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Baloyi LN. The production of hydrogen from the water gas shift reaction through the use of a palladium-silver membrane reactor . [Thesis]. Cape Peninsula University of Technology; 2016. Available from: http://etd.cput.ac.za/handle/20.500.11838/2470

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Durban University of Technology

7. Mthethwa, Nonsikelelo Precios. Enhancement of biohydrogen production from the aquatic weed Pistia stratiotes through a dark fermentation process.

Degree: 2019, Durban University of Technology

URL: http://hdl.handle.net/10321/3217

►

Submitted in fulfillment of the requirements of the degree of Masters in Applied Sciences: Biotechnology, Durban University of Technology, Durban, South Africa, 2019.

Aquatic weeds… (more)

▼

Submitted in fulfillment of the requirements of the degree of Masters in Applied Sciences: Biotechnology, Durban University of Technology, Durban, South Africa, 2019.

Aquatic weeds are well known for their fast growth rate and high carbohydrate content that can be easily hydrolysed into fermentable sugars. This study was aimed at the utilization of an indigenous aquatic weed, Pistia stratiotes for biohydrogen production through the dark fermentation process. Characterization of the biomass, effect of pre–treatment methods on biomass hydrolysis, effect of reactor operational conditions and type of inoculum on enhancing hydrogen production potential of P. stratiotes was assessed. Physical and chemical pre–treatments were employed on P. stratiotes biomass to increase digestibility and to achieve high conversion rates of fermentable sugars. The highest sugar yield of 139± 0.8 mg/g was obtained when the oven dried biomass was subjected to H2SO4 (2.5%) pre– treatment followed by autoclaving at 121°C for 30 min. Biohydrogen production under different operational conditions was thereafter optimized using One–factor–at–a–time (OFAT) batch experiments in 120 mL serum bottles. A maximum hydrogen yield (HY) of 2.46 ± 0.14 mol-H2/mol-glucose (3.51 ± 0.20 mg-H2/g-dry weight) and 2.75 ± 0.07 mL h-1 hydrogen production rate was observed under optimized conditions (pH 5.5, Temp 35°C, S/X: 1.0 g-COD/g-VSS and HRT 8 h). The organic mass balance (92 – 96%) and electron– equivalent balance (92 – 98%) further indicated the reliability of the obtained fermentation data. Assessment of microbial activity was achieved using molecular techniques such as quantitative polymerase chain reaction (qPCR) targeting both 16s rRNA (of Clostridium spp., Bacillus spp., and Enterobacter spp.) and the functional hydrogenase gene (hydA). The highest gene activity of hydrogenase was noted at pH of 5.5 with 2.53×104 copies/ng-DNA compared to low pH: 4.5 (6.95 × 103 copies/ng-DNA) and high pH: 8.5 (7.77×103 copies/ng- DNA). A similar trend was also observed for the species containing a highly active hydrogenase (i.e. Clostridium spp., Bacillus spp., and Enterobacter spp.). During the optimum reactor conditions, three hydrogen producing bacterial strains Bacillus cereus and Enterobacter cloacae were successfully isolated. These isolates were used as inoculums for the pure culture studies and achieved HYs of 2.2, 1.10 and 1.97 mol-H2/mol-glucose respectively under optimized fermentation conditions. However, the thermally treated mixed culture displayed a marginally higher HY (2.46 mol-H2/mol-glucose) compared to the pure culture used alone. Furthermore, the cost estimation indicated a potential and economically feasible for biotransformation of P. stratiotes to hydrogen energy. In conclusion, the results from this study has revealed the potential of employing P. stratiotes biomass for biohydrogen production. The results also indicated the importance of employing suitable pre–treatment methods, operating conditions as well as inoculum types for enhanced…

Advisors/Committee Members: Pillai, Santhosh Kumar Kuttan, Bux, Faizal, Kiambi, Sammy Lewis.

Subjects/Keywords: Hydrogen – Biotechnology; Water lettuce; Fermentation; Biomass energy; Hydrogen as fuel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mthethwa, N. P. (2019). Enhancement of biohydrogen production from the aquatic weed Pistia stratiotes through a dark fermentation process. (Thesis). Durban University of Technology. Retrieved from http://hdl.handle.net/10321/3217

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mthethwa, Nonsikelelo Precios. “Enhancement of biohydrogen production from the aquatic weed Pistia stratiotes through a dark fermentation process.” 2019. Thesis, Durban University of Technology. Accessed April 14, 2021. http://hdl.handle.net/10321/3217.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mthethwa, Nonsikelelo Precios. “Enhancement of biohydrogen production from the aquatic weed Pistia stratiotes through a dark fermentation process.” 2019. Web. 14 Apr 2021.

Vancouver:

Mthethwa NP. Enhancement of biohydrogen production from the aquatic weed Pistia stratiotes through a dark fermentation process. [Internet] [Thesis]. Durban University of Technology; 2019. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10321/3217.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mthethwa NP. Enhancement of biohydrogen production from the aquatic weed Pistia stratiotes through a dark fermentation process. [Thesis]. Durban University of Technology; 2019. Available from: http://hdl.handle.net/10321/3217

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cape Peninsula University of Technology

8. Kula, Lungelwa Ethel. Development of a palladium based membrane reactor system for production of ultra-pure hydrogen from liquefied petroleum gas .

Degree: 2017, Cape Peninsula University of Technology

URL: http://etd.cput.ac.za/handle/20.500.11838/2598

► Hydrogen is widely regarded as the clean energy carrier for future use in both transportation and electricity sectors. It has become an important new focus… (more)

Subjects/Keywords: Hydrogen as fuel; Fuel cells; Membrane reactors; Liquefied petroleum gas

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kula, L. E. (2017). Development of a palladium based membrane reactor system for production of ultra-pure hydrogen from liquefied petroleum gas . (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2598

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kula, Lungelwa Ethel. “Development of a palladium based membrane reactor system for production of ultra-pure hydrogen from liquefied petroleum gas .” 2017. Thesis, Cape Peninsula University of Technology. Accessed April 14, 2021. http://etd.cput.ac.za/handle/20.500.11838/2598.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kula, Lungelwa Ethel. “Development of a palladium based membrane reactor system for production of ultra-pure hydrogen from liquefied petroleum gas .” 2017. Web. 14 Apr 2021.

Vancouver:

Kula LE. Development of a palladium based membrane reactor system for production of ultra-pure hydrogen from liquefied petroleum gas . [Internet] [Thesis]. Cape Peninsula University of Technology; 2017. [cited 2021 Apr 14]. Available from: http://etd.cput.ac.za/handle/20.500.11838/2598.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kula LE. Development of a palladium based membrane reactor system for production of ultra-pure hydrogen from liquefied petroleum gas . [Thesis]. Cape Peninsula University of Technology; 2017. Available from: http://etd.cput.ac.za/handle/20.500.11838/2598

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

IUPUI

9. Zamani Farahani, Mahmoud Reza. Integrated micro PEM fuel cell with self-regulated hydrogen generation from ammonia borane.

Degree: 2015, IUPUI

URL: http://hdl.handle.net/1805/7970

►

Indiana University-Purdue University Indianapolis (IUPUI)

An integrated micro PEM fuel cell system with self-regulated hydrogen generation from ammonia borane is reported to power portable electronics.… (more)

Subjects/Keywords: Micro hydrogen generator; Micro PEM fuel cell; Microfluidics; Fuel cells; Microtechnology; Hydrogen as fuel; Hydrogen – Storage; Catalysts; Ammonia; Boranes

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zamani Farahani, M. R. (2015). Integrated micro PEM fuel cell with self-regulated hydrogen generation from ammonia borane. (Thesis). IUPUI. Retrieved from http://hdl.handle.net/1805/7970

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zamani Farahani, Mahmoud Reza. “Integrated micro PEM fuel cell with self-regulated hydrogen generation from ammonia borane.” 2015. Thesis, IUPUI. Accessed April 14, 2021. http://hdl.handle.net/1805/7970.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zamani Farahani, Mahmoud Reza. “Integrated micro PEM fuel cell with self-regulated hydrogen generation from ammonia borane.” 2015. Web. 14 Apr 2021.

Vancouver:

Zamani Farahani MR. Integrated micro PEM fuel cell with self-regulated hydrogen generation from ammonia borane. [Internet] [Thesis]. IUPUI; 2015. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1805/7970.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zamani Farahani MR. Integrated micro PEM fuel cell with self-regulated hydrogen generation from ammonia borane. [Thesis]. IUPUI; 2015. Available from: http://hdl.handle.net/1805/7970

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Aberdeen

10. Stewart, Laura. Quantification of environmentally sensitive emissions by substitution of traditional domestic application power sources with renewable hydrogen fuelled solid oxide fuel cell combined heat and power.

Degree: School of Biological Sciences., 2010, University of Aberdeen

URL: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=128251 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=128251&custom_att_2=simple_viewer

Subjects/Keywords: Hydrogen as fuel.; Hydrogen; Fuel cells

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Stewart, L. (2010). Quantification of environmentally sensitive emissions by substitution of traditional domestic application power sources with renewable hydrogen fuelled solid oxide fuel cell combined heat and power. (Doctoral Dissertation). University of Aberdeen. Retrieved from http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=128251 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=128251&custom_att_2=simple_viewer

Chicago Manual of Style (16^th Edition):

Stewart, Laura. “Quantification of environmentally sensitive emissions by substitution of traditional domestic application power sources with renewable hydrogen fuelled solid oxide fuel cell combined heat and power.” 2010. Doctoral Dissertation, University of Aberdeen. Accessed April 14, 2021. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=128251 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=128251&custom_att_2=simple_viewer.

MLA Handbook (7^th Edition):

Stewart, Laura. “Quantification of environmentally sensitive emissions by substitution of traditional domestic application power sources with renewable hydrogen fuelled solid oxide fuel cell combined heat and power.” 2010. Web. 14 Apr 2021.

Vancouver:

Stewart L. Quantification of environmentally sensitive emissions by substitution of traditional domestic application power sources with renewable hydrogen fuelled solid oxide fuel cell combined heat and power. [Internet] [Doctoral dissertation]. University of Aberdeen; 2010. [cited 2021 Apr 14]. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=128251 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=128251&custom_att_2=simple_viewer.

Council of Science Editors:

Stewart L. Quantification of environmentally sensitive emissions by substitution of traditional domestic application power sources with renewable hydrogen fuelled solid oxide fuel cell combined heat and power. [Doctoral Dissertation]. University of Aberdeen; 2010. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=128251 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=128251&custom_att_2=simple_viewer

Hong Kong University of Science and Technology

11. Ye, Qiang. Spontaneous hydrogen evolution in direct methanol fuel cells.

Degree: 2005, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-2676 ; https://doi.org/10.14711/thesis-b921510 ; http://repository.ust.hk/ir/bitstream/1783.1-2676/1/th_redirect.html

► A direct methanol fuel cell (DMFC) is an electrochemical energy conversion device that converts chemical energy of liquid methanol into electrical energy. Because of its… (more)

▼ A direct methanol fuel cell (DMFC) is an electrochemical energy conversion device that converts chemical energy of liquid methanol into electrical energy. Because of its simplicity and high energy density, the DMFC has been identified as the most promising power source for portable and mobile applications. In this thesis, for the first time, hydrogen was found to evolve spontaneously on the anode of the DMFC under the open-circuit condition and at low oxygen flow rates. This finding is contrary to the conventional wisdom that electrochemical reactions cease as the external load is removed. It was also found that a transient spontaneous hydrogen evolution took place on the DMFC anode under the open-circuit condition whenever the oxygen supply was started up or turned off. Subsequently, this thesis puts forward a theoretical explanation of the mechanism leading to the peculiar phenomenon of hydrogen evolution. The remainder of this thesis work was then focused on investigating the effect of spontaneous hydrogen evolution on the operation characteristic of the DMFC. For example, it was found that the spontaneous hydrogen evolution induced by oxygen supply interruptions accelerated the membrane electrode assembly (MEA) activation process and created a temporary rise in the DMFC performance. Another finding is that when the oxygen flow rate was reduced to a critical value, the open circuit voltage (OCV) of the DMFC declined abruptly from the normal value when the oxygen flow rate was sufficiently high. It was found that the abrupt decline in the OCV at this critical oxygen flow rate (COFR) coincided with the onset of the spontaneous hydrogen evolution in the DMFC. Theoretically, it is shown that the mass flux of oxygen furnished at the COFR balances the oxidation rate of methanol that permeates from the anode to cathode, which means that the COFR is a measure of the methanol permeation rate through the membrane. The equivalent methanol permeation current density determined from the COFR were found to be in reasonable agreement with that measured from the permeation cell for different methanol concentrations and at different temperatures. Finally, this thesis presents a transient OCV overshoot behavior during the startup period of oxygen supply, which was also due to the hydrogen evolution on the DMFC anode. It was found that the OCV of the DMFC underwent an overshoot before it stabilized during the startup period of oxygen supply. More importantly, it is shown that within the OCV overshoot period the DMFC anode behaved like a hydrogen electrode due to the existence of hydrogen at the catalyst layer, resulting in a transient reference hydrogen electrode, which allows quantifying the respective anode and cathode potentials of the DMFC. Keywords: Direct methanol fuel cell; Methanol crossover; Methanol oxidation; Hydrogen evoIution; Hydrogen oxidation; Open-circuit voltage; Activation; Voltage overshoot; Limiting current density; Critical oxygen flow rate; Overpotential; Self-discharging.

Subjects/Keywords: Fuel cells ; Methanol as fuel ; Hydrogen as fuel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ye, Q. (2005). Spontaneous hydrogen evolution in direct methanol fuel cells. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-2676 ; https://doi.org/10.14711/thesis-b921510 ; http://repository.ust.hk/ir/bitstream/1783.1-2676/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ye, Qiang. “Spontaneous hydrogen evolution in direct methanol fuel cells.” 2005. Thesis, Hong Kong University of Science and Technology. Accessed April 14, 2021. http://repository.ust.hk/ir/Record/1783.1-2676 ; https://doi.org/10.14711/thesis-b921510 ; http://repository.ust.hk/ir/bitstream/1783.1-2676/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ye, Qiang. “Spontaneous hydrogen evolution in direct methanol fuel cells.” 2005. Web. 14 Apr 2021.

Vancouver:

Ye Q. Spontaneous hydrogen evolution in direct methanol fuel cells. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2005. [cited 2021 Apr 14]. Available from: http://repository.ust.hk/ir/Record/1783.1-2676 ; https://doi.org/10.14711/thesis-b921510 ; http://repository.ust.hk/ir/bitstream/1783.1-2676/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ye Q. Spontaneous hydrogen evolution in direct methanol fuel cells. [Thesis]. Hong Kong University of Science and Technology; 2005. Available from: http://repository.ust.hk/ir/Record/1783.1-2676 ; https://doi.org/10.14711/thesis-b921510 ; http://repository.ust.hk/ir/bitstream/1783.1-2676/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Johannesburg

12. Mabiza, Junior Mabiza. Energy potential and sustainability management of platinum catalysed fuel cell technology in South Africa.

Degree: 2013, University of Johannesburg

URL: http://hdl.handle.net/10210/8672

►

M.Tech. (Construction Management)

In this study the environmental aspect of sustainability of the platinum catalysed Hydrogen Fuel Cell Technology (HFCT) in progress in South Africa… (more)

▼

M.Tech. (Construction Management)

In this study the environmental aspect of sustainability of the platinum catalysed Hydrogen Fuel Cell Technology (HFCT) in progress in South Africa is examined as two case studies. The first case study is a laboratory-based process of platinum nanophase composite electrode prototype suitable for SPE electrolyser and PEM fuel cell. The second case study is the Anglo American Platinum industrial engineering process of recovering platinum group metals (PGMs). Environmental assessments were achieved using Life Cycle Assessment (LCA) standard ISO 14040 series and the Eco-indicator 99 methodology. The energy potential and sustainable development of the South African HFCT initiative as well as the initiative public awareness are also looked into. Emerging as high concerns in the region are South African coal-based and gas supply security for energy supply and sustainability, and the growth of energy demand. The heavy South African carbon footprint and the related global climate change are also high concerns. The South African cabinet adopted hydrogen and fuel cell technology as one of the priority technologies to be developed in a bid to reduce the country’s dependence on coal-fired power generation, oil and gas. The Department of Science and Technology (DST) submitted this proposition initiated from the public and private sectors; and this has been seen as a significant competitive advantage for the global HFCT initiatives in view of the country’s abundant platinum metals deposits, a key raw material in fuel cells. Arguing that the adoption of renewable energy systems as clean technology calls for the achievement of the ecology leg aims of sustainability. An environmental assessment over synthesizing nanophase composite electrode and producing platinum group metals are therefore proved to be pertinent. Results of LCA showed equivalent emissions of carbon dioxide in the preparation process of 119.23g electrode platinum nanophase were evaluated at approximately 8.78 kg CO2eq. Over 90% of all emissions of carbon dioxide equivalent were attributed to energy supplied, produced by emitting resources. Direct emissions which were mostly of chemicals were probably involved in the heating, calcining and drying of materials. The environmental impact assessment by Eco-indicator 99 methodology based on LCA results of the platinum composite electrode determined airborne likely potential emissions such as carbon monoxide, NOX, Ethanol, Formaldehyde, SOX and water vapour with their evaluated impacts as well as other potential emissions to soil/water such as wastewater and HMS matrix which can be recycled. LCA results of the PGMs recovery process showed airborne and waterborne emissions as well as emissions to soil. Emissions observed were both direct and indirect. Direct emissions were from ore composites, chemicals, coal, fuels and water recycled. Over 91% of GHG emissions are indirect from energy supplied. The largest environmental damage impact caused by over 91% of GHG emissions indirect to PGMs…

Subjects/Keywords: Anglo American (Firm); Hydrogen industry - South Africa - Management; Hydrogen as fuel - Case studies; Sustainable development

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mabiza, J. M. (2013). Energy potential and sustainability management of platinum catalysed fuel cell technology in South Africa. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/8672

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mabiza, Junior Mabiza. “Energy potential and sustainability management of platinum catalysed fuel cell technology in South Africa.” 2013. Thesis, University of Johannesburg. Accessed April 14, 2021. http://hdl.handle.net/10210/8672.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mabiza, Junior Mabiza. “Energy potential and sustainability management of platinum catalysed fuel cell technology in South Africa.” 2013. Web. 14 Apr 2021.

Vancouver:

Mabiza JM. Energy potential and sustainability management of platinum catalysed fuel cell technology in South Africa. [Internet] [Thesis]. University of Johannesburg; 2013. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10210/8672.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mabiza JM. Energy potential and sustainability management of platinum catalysed fuel cell technology in South Africa. [Thesis]. University of Johannesburg; 2013. Available from: http://hdl.handle.net/10210/8672

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

13. Kyazze, Godfrey. Hydrogen production via dark fermentation of carbohydrate-rich substrates.

Degree: PhD, 2007, University of South Wales

URL: https://pure.southwales.ac.uk/en/studentthesis/hydrogen-production-via-dark-fermentation-of-carbohydraterich-substrates(99988ecc-92c4-4c04-98a2-23ff8d097fc3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436365

► Hydrogen could replace fossil fuels for power generation and transportation and contribute to a low carbon economy. However, current methods of producing hydrogen e.g. steam… (more)

▼ Hydrogen could replace fossil fuels for power generation and transportation and contribute to a low carbon economy. However, current methods of producing hydrogen e.g. steam methane reformation of natural gas are not sustainable and also contribute to COi emissions. Dark fermentation of carbohydrate-rich waste organics and energy crops to hydrogen using mixed microflora could contribute to the mix of technologies for producing hydrogen sustainably. Naturally available mixed microflora can be enriched e.g. by heat treatment to select for hydrogen producers, typically clostridia. Fermentation endproducts from the hydrogen-producing stage could be fed to a second anaerobic digestion stage to recover more energy as methane and to stabilise the effluent. Although anaerobic digestion is well established, fermentative hydrogen production is not. This work evaluated the feasibility of hydrogen production from two energy crops, grass and fodder maize in batch culture without pretreatment; investigated the effect of increase in substrate (sucrose) concentration, attractive from an energy point of view, on the yield and stability of hydrogen production in continuous culture; examined the performance of a mesophilic high rate anaerobic digester treating effluent from a continuous hydrogen-producing bioreactor; demonstrated the possibility of changeover of substrate - sucrose, starch and xylose - during continuous hydrogen production and evaluated the effect of sparging with CO2 , a process gas, on hydrogen production. It was demonstrated for the first time that hydrogen production from grass and fodder maize by direct fermentation in batch culture (2.3 L reactor, 35°C, pH 5.2-5.3) is possible, with hydrogen yields of 75.6 ml/g dry matter wilted perennial rye grass and62.4 ml/g dry matter of fodder maize. In continuous culture (pH 5.2-5.3, 35°C, 12 hour hydraulic retention time (HRT)), stable hydrogen production was achieved up to 40 g/L sucrose concentration - with decreasing hydrogen yields, from 1.7±0.2 mol/mol hexose added at 10 g/L to 1.2±0.3 mol/mol hexose at 40 g/L - beyond which the system became unstable. The decrease in hydrogen yield and lack of stability at higher substrate concentrations was attributed to feedback inhibition by volatile fatty acids (VFAs). Effluent from the hydrogen reactor was readily degraded in an upflow anaerobic filter up to an organic loading rate of 10 gCOD/L/d (2 d HRT) and/or a sodium concentration of 1.87 g/L. Reduction of sodium levels in the methane reactor by using calcium hydroxide as alkali in the hydrogen reactor was found to extend the efficiency of degradation of VFAs; overall COD reduction for the two stage system fed with 20 g/L sucrose increased from 83% (with NaOH as alkali) to 91% with Ca(OH)2 . It was easier to switch from starch to sucrose and vice versa during continuous hydrogen production; however switching from sucrose or starch to xylose was slower, requiring operation for about 1 day in batch culture before continuous operation could commence. Sparging with CO2 improved…

Subjects/Keywords: 661.08; Hydrogen as fuel; Hydrogen; Research

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kyazze, G. (2007). Hydrogen production via dark fermentation of carbohydrate-rich substrates. (Doctoral Dissertation). University of South Wales. Retrieved from https://pure.southwales.ac.uk/en/studentthesis/hydrogen-production-via-dark-fermentation-of-carbohydraterich-substrates(99988ecc-92c4-4c04-98a2-23ff8d097fc3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436365

Chicago Manual of Style (16^th Edition):

Kyazze, Godfrey. “Hydrogen production via dark fermentation of carbohydrate-rich substrates.” 2007. Doctoral Dissertation, University of South Wales. Accessed April 14, 2021. https://pure.southwales.ac.uk/en/studentthesis/hydrogen-production-via-dark-fermentation-of-carbohydraterich-substrates(99988ecc-92c4-4c04-98a2-23ff8d097fc3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436365.

MLA Handbook (7^th Edition):

Kyazze, Godfrey. “Hydrogen production via dark fermentation of carbohydrate-rich substrates.” 2007. Web. 14 Apr 2021.

Vancouver:

Kyazze G. Hydrogen production via dark fermentation of carbohydrate-rich substrates. [Internet] [Doctoral dissertation]. University of South Wales; 2007. [cited 2021 Apr 14]. Available from: https://pure.southwales.ac.uk/en/studentthesis/hydrogen-production-via-dark-fermentation-of-carbohydraterich-substrates(99988ecc-92c4-4c04-98a2-23ff8d097fc3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436365.

Council of Science Editors:

Kyazze G. Hydrogen production via dark fermentation of carbohydrate-rich substrates. [Doctoral Dissertation]. University of South Wales; 2007. Available from: https://pure.southwales.ac.uk/en/studentthesis/hydrogen-production-via-dark-fermentation-of-carbohydraterich-substrates(99988ecc-92c4-4c04-98a2-23ff8d097fc3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436365

Colorado State University

14. Nitsche, David Martin. Synthesis and characterization of complex metal hydrides for hydrogen technology.

Degree: MS(M.S.), Mechanical Engineering, 2010, Colorado State University

URL: http://hdl.handle.net/10217/39247

► The limitation as well as the environmental impact of fossil fuels has encouraged the development of alternative energies. As an alternative, hydrogen and its applications… (more)

Subjects/Keywords: Hydrides; Hydrogen as fuel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nitsche, D. M. (2010). Synthesis and characterization of complex metal hydrides for hydrogen technology. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/39247

Chicago Manual of Style (16^th Edition):

Nitsche, David Martin. “Synthesis and characterization of complex metal hydrides for hydrogen technology.” 2010. Masters Thesis, Colorado State University. Accessed April 14, 2021. http://hdl.handle.net/10217/39247.

MLA Handbook (7^th Edition):

Nitsche, David Martin. “Synthesis and characterization of complex metal hydrides for hydrogen technology.” 2010. Web. 14 Apr 2021.

Vancouver:

Nitsche DM. Synthesis and characterization of complex metal hydrides for hydrogen technology. [Internet] [Masters thesis]. Colorado State University; 2010. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10217/39247.

Council of Science Editors:

Nitsche DM. Synthesis and characterization of complex metal hydrides for hydrogen technology. [Masters Thesis]. Colorado State University; 2010. Available from: http://hdl.handle.net/10217/39247

University of Hong Kong

15. Ting, Siu-wa. Catalytic hydrogen generation from formic acid on supported platinum-ruthenium-bismuth oxide.

Degree: 2011, University of Hong Kong

URL: http://hdl.handle.net/10722/193061

Subjects/Keywords: Hydrogen as fuel; Metal catalysts

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ting, S. (2011). Catalytic hydrogen generation from formic acid on supported platinum-ruthenium-bismuth oxide. (Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/193061

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ting, Siu-wa. “Catalytic hydrogen generation from formic acid on supported platinum-ruthenium-bismuth oxide.” 2011. Thesis, University of Hong Kong. Accessed April 14, 2021. http://hdl.handle.net/10722/193061.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ting, Siu-wa. “Catalytic hydrogen generation from formic acid on supported platinum-ruthenium-bismuth oxide.” 2011. Web. 14 Apr 2021.

Vancouver:

Ting S. Catalytic hydrogen generation from formic acid on supported platinum-ruthenium-bismuth oxide. [Internet] [Thesis]. University of Hong Kong; 2011. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10722/193061.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ting S. Catalytic hydrogen generation from formic acid on supported platinum-ruthenium-bismuth oxide. [Thesis]. University of Hong Kong; 2011. Available from: http://hdl.handle.net/10722/193061

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

16. Khan, Md. Faysal Ahamed. Kinetic Study of Catalytic Partial Oxidation of Synthetic Diesel for Hydrogen Production.

Degree: MASc, Engineering - Process Systems, 2012, University of Regina

URL: http://hdl.handle.net/10294/3542

► The focus of this research is to study the kinetics of the catalytic partial oxidation (CPOX) of synthetic diesel (SD) for hydrogen production. The kinetic… (more)

▼ The focus of this research is to study the kinetics of the catalytic partial oxidation (CPOX) of synthetic diesel (SD) for hydrogen production. The kinetic experiments were done in a packed bed tubular reactor (PBTR) over a 5wt.%Ni/Ce[subscript 0.5Z]r[subscript 0.33]Ca0.085Y[subscript 0.085] (5N/CZCaY) catalyst prepared by a surfactant-assisted route. The SD is composed of 75 vol.% saturated hydrocarbons and 25 vol.% aromatic hydrocarbons, with an average chemical formula resembling commercial diesel C[subscript 12.87]H[subscript 24.81]. The kinetic experiments were conducted at atmospheric pressure, in the temperature range of 1123-1223K (850- 950 degrees C), with oxygen/synthetic diesel (O2/SD) ratio in the range of 6.7-10.5 and W/FSD,0 weight-time) in the range of 19008-47556 kg[subscript catalyst]*s/kmol[subscript SD]. The experimental results were used to derive an empirical power law rate model. This model was of the form: r'SD = K0e(-E/RT)NmSDNn02. Activation energy was found to be 16kJ/mol and the order of reaction with respect to SD was 1.89 (≈2) and with respect to oxygen was found to be 0.41 (≈1/2). Estimation of the values of the model parameters was based on the minimization of the sum of the residual squares of the reaction rates by Gauss-Newton and Levenberg-Marquardt algorithm using non-linear regression (NLREG) software. Excellent agreement between the experimental and predicted rate was established with an absolute average deviation (AAD) of 8%. The 5N/CZCaY catalyst was tested for an extended time on stream (TOS) operation in order to establish and demonstrate that the catalyst is stable and also to ensure steady state performance. In addition, the effects of reaction parameters such as reaction temperature, feed ratio (O[subscript 2]/SD), and weight-time W/F[subscript SD,0]) on the resultant catalytic activity of the chosen catalyst were also investigated in order to obtain the optimal operating conditions for H[subscript 2] production from CPOX of SD. To the best of our knowledge, the current study is the first of its kind on the CPOX reforming of SD. Advisors/Committee Members: Idem, Raphael (advisor), Ibrahim, Hussameldin (advisor), Torabi, Farshid (committee member), Gu, Yongan (committee member), Zeng, Fanhua (externalexaminer).

Subjects/Keywords: Hydrogen as fuel; Diesel fuels; Synthetic fuels; Oxidation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Khan, M. F. A. (2012). Kinetic Study of Catalytic Partial Oxidation of Synthetic Diesel for Hydrogen Production. (Masters Thesis). University of Regina. Retrieved from http://hdl.handle.net/10294/3542

Chicago Manual of Style (16^th Edition):

Khan, Md Faysal Ahamed. “Kinetic Study of Catalytic Partial Oxidation of Synthetic Diesel for Hydrogen Production.” 2012. Masters Thesis, University of Regina. Accessed April 14, 2021. http://hdl.handle.net/10294/3542.

MLA Handbook (7^th Edition):

Khan, Md Faysal Ahamed. “Kinetic Study of Catalytic Partial Oxidation of Synthetic Diesel for Hydrogen Production.” 2012. Web. 14 Apr 2021.

Vancouver:

Khan MFA. Kinetic Study of Catalytic Partial Oxidation of Synthetic Diesel for Hydrogen Production. [Internet] [Masters thesis]. University of Regina; 2012. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10294/3542.

Council of Science Editors:

Khan MFA. Kinetic Study of Catalytic Partial Oxidation of Synthetic Diesel for Hydrogen Production. [Masters Thesis]. University of Regina; 2012. Available from: http://hdl.handle.net/10294/3542

17. Sabri, Faezeh. Catalysts for Hydrogen Production by the Auto-Thermal Reforming of Glycerol.

Degree: MASc, Engineering - Process Systems, 2013, University of Regina

URL: http://hdl.handle.net/10294/3794

► Due to a number of major environmental issues, essentially greenhouse gas emissions and fossil fuel reliance, the implications of hydrogen as a promising clean energy… (more)

▼ Due to a number of major environmental issues, essentially greenhouse gas emissions and fossil fuel reliance, the implications of hydrogen as a promising clean energy carrier have significantly increased. In this respect, the use of bio-renewable feedstock such as glycerol for hydrogen production is becoming important. The majority of natural glycerol is produced as a by-product of the bio-diesel industry. Presently, almost all crude glycerol is refined before its ultimate end use. It is the ultimate goal of the present study to develop an effective catalytic auto-thermal reforming process to convert glycerol into top value bio-based products. Glycerol can be converted to hydrogen-rich streams by steam reforming (SR), partial oxidation (POX), gasification, auto-thermal reforming (ATR), supercritical water reforming (SCWR) or aqueous-phase reforming (APR). Most of the studies have focused on SR processes for producing hydrogen over various costly noble metal-based catalysts. A portfolio of nickel-based catalysts with nominal composition 5% Ni/Ce0.5Zr0.33M0.16O2- [where M is the promoter element(s) selected from Mg, Ca, Y, La, or Gd] was prepared and examined for their catalyst activity for glycerol auto-thermal reforming. The catalysts’ activity was evaluated using a plug flow reactor at atmospheric pressure and in the temperature range of 450°C to 700°C, steam-to-glycerol ratio of 6, 9, and 12, and oxygen-to-glycerol ratio of 0.2, 0.5, and 0.8 at atmospheric pressure in a packed bed tubular reactor (PBTR). The preliminary screening studies were carried out for a time-on-stream (TOS) of 6 hours with sampling intervals of 1 hour. The physicochemical and textural characteristics of the catalysts were investigated by means of a variety of characterization techniques such as temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO), nitrogen (N2) physisorption, hydrogen (H2) chemisorption, UV-Vis diffuse, thermogravimetry analysis (TGA), and X-ray diffraction (XRD). The gaseous products were analyzed by online gas chromatography equipped with a thermal conductivity detector (GC/TCD). The structural, textural, and physicochemical characteristics of the catalysts have been investigated with the help of different bulk and surface characterization techniques. Different ratios of steam/glycerol and oxygen /glycerol were employed to optimize the conditions to achieve the highest conversion as well as H2 selectivity. Based on the above analyses, glycerol conversion and H2 selectivity were calculated. Among all the catalyst formulations screened in the current study, the catalyst formulations prepared with Ca, Y, Mg, La, and Gd exhibit stable and steady activity even at 500°C. The catalyst formulation with Gd as a promoter element performed the best at all the investigated temperatures. Hence, it is a potential candidate for future commercialization and plausible membrane reactor applications. The thermal and catalytic effects on catalytic auto-thermal reforming were… Advisors/Committee Members: Ibrahim, Hussameldin (advisor), Idem, Raphael (advisor), deMontigny, David (committee member), Shirif, Ezeddin (committee member), Henni, Amr (externalexaminer).

Subjects/Keywords: Hydrogen as fuel – Research; Glycerin – Industrial applications; Catalysts; Catalytic reforming

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sabri, F. (2013). Catalysts for Hydrogen Production by the Auto-Thermal Reforming of Glycerol. (Masters Thesis). University of Regina. Retrieved from http://hdl.handle.net/10294/3794

Chicago Manual of Style (16^th Edition):

Sabri, Faezeh. “Catalysts for Hydrogen Production by the Auto-Thermal Reforming of Glycerol.” 2013. Masters Thesis, University of Regina. Accessed April 14, 2021. http://hdl.handle.net/10294/3794.

MLA Handbook (7^th Edition):

Sabri, Faezeh. “Catalysts for Hydrogen Production by the Auto-Thermal Reforming of Glycerol.” 2013. Web. 14 Apr 2021.

Vancouver:

Sabri F. Catalysts for Hydrogen Production by the Auto-Thermal Reforming of Glycerol. [Internet] [Masters thesis]. University of Regina; 2013. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10294/3794.

Council of Science Editors:

Sabri F. Catalysts for Hydrogen Production by the Auto-Thermal Reforming of Glycerol. [Masters Thesis]. University of Regina; 2013. Available from: http://hdl.handle.net/10294/3794

18. Knapp, Nathan Michael. Using a membrane reactor for the sulfur-sulfur thermochemical water-splitting cycle.

Degree: MS, Chemical Engineering, 2011, Oregon State University

URL: http://hdl.handle.net/1957/26542

► The hydrogen economy is a possible component of an energy future based on use of alternative and renewable energy sources, deemed desirable from the general… (more)

Subjects/Keywords: mircroreactor; Hydrogen as fuel

…liquid hydrogen as a fuel is not only feasible technically and economically, but it is… …generating. As seen in equations 2.3.1 and 2.3.2, three times the amount of hydrogen is generated… …Currently it is both an energy source and its derivatives are energy carriers. Hydrogen, as being… …subsequently greenhouse gas generation, carbon dioxide. Hydrogen as an energy carrier would not… …replace electricity it would occur on a case by case basis. Also hydrogen does not have as many…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Knapp, N. M. (2011). Using a membrane reactor for the sulfur-sulfur thermochemical water-splitting cycle. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/26542

Chicago Manual of Style (16^th Edition):

Knapp, Nathan Michael. “Using a membrane reactor for the sulfur-sulfur thermochemical water-splitting cycle.” 2011. Masters Thesis, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/26542.

MLA Handbook (7^th Edition):

Knapp, Nathan Michael. “Using a membrane reactor for the sulfur-sulfur thermochemical water-splitting cycle.” 2011. Web. 14 Apr 2021.

Vancouver:

Knapp NM. Using a membrane reactor for the sulfur-sulfur thermochemical water-splitting cycle. [Internet] [Masters thesis]. Oregon State University; 2011. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/26542.

Council of Science Editors:

Knapp NM. Using a membrane reactor for the sulfur-sulfur thermochemical water-splitting cycle. [Masters Thesis]. Oregon State University; 2011. Available from: http://hdl.handle.net/1957/26542

19. Teera Chookaew. Process development of biohydrogen production from crude glycerol of biodiesel plant by thermotolerant bacteria .

Degree: คณะอุตสาหกรรมเกษตร ภาควิชาเทคโนโลยีชีวภาพอุตสาหกรรม, 2014, Prince of Songkla University

URL: http://kb.psu.ac.th/psukb/handle/2010/9668

Subjects/Keywords: Hydrogen as fuel; Biotechnology; Glycerin

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chookaew, T. (2014). Process development of biohydrogen production from crude glycerol of biodiesel plant by thermotolerant bacteria . (Thesis). Prince of Songkla University. Retrieved from http://kb.psu.ac.th/psukb/handle/2010/9668

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chookaew, Teera. “Process development of biohydrogen production from crude glycerol of biodiesel plant by thermotolerant bacteria .” 2014. Thesis, Prince of Songkla University. Accessed April 14, 2021. http://kb.psu.ac.th/psukb/handle/2010/9668.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chookaew, Teera. “Process development of biohydrogen production from crude glycerol of biodiesel plant by thermotolerant bacteria .” 2014. Web. 14 Apr 2021.

Vancouver:

Chookaew T. Process development of biohydrogen production from crude glycerol of biodiesel plant by thermotolerant bacteria . [Internet] [Thesis]. Prince of Songkla University; 2014. [cited 2021 Apr 14]. Available from: http://kb.psu.ac.th/psukb/handle/2010/9668.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chookaew T. Process development of biohydrogen production from crude glycerol of biodiesel plant by thermotolerant bacteria . [Thesis]. Prince of Songkla University; 2014. Available from: http://kb.psu.ac.th/psukb/handle/2010/9668

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

20. Ghazvini, Mohammad. Compact integrated microchannel combustor, recuperator and heat exchanger For hydrogen storage applications.

Degree: PhD, Mechanical Engineering, 2013, Oregon State University

URL: http://hdl.handle.net/1957/43337

► A novel microscale combustor-heat exchanger (μCHX) for hydrogen storage applications is presented in this dissertation. The design of the μCHX is motivated by its application… (more)

▼ A novel microscale combustor-heat exchanger (μCHX) for hydrogen storage applications is presented in this dissertation. The design of the μCHX is motivated by its application to two particular systems for automotive use- those that utilize metal hydrides (MH) and cryo-adsorbents (CA) to store hydrogen. Thermal energy needs to be supplied to the MH bed to raise its temperature to 170 °C in order to desorb hydrogen for use in a fuel cell. On the other hand, in a CA system, hydrogen gas that exits the storage tank needs to be heated to a minimum temperature of -40 °C prior to entering the fuel cell. During cold start conditions, heat exchange with ambient air or with the fuel cell coolant is insufficient to provide this minimum temperature, thereby requiring an additional source of thermal energy. For both storage systems, the required thermal energy can be provided by oxidizing a small amount of hydrogen and transferring the heat from combustion to the working fluid, which is an oil in a MH system and hydrogen in a CA system. The μCHX presented herein is a compact and highly efficient way of providing the required thermal energy rate. The µCHX is comprised of repeating unit cells that each perform identical unit operations, namely (a) catalytic combustion of a hydrogen-air mixture, (b) transfer of produced thermal energy rate to a heat transfer fluid, and (c) recuperation between the exhaust gas stream and incoming reactant gases. Heterogeneous catalytic combustion occurs on the walls of microchannels in the presence of a platinum catalyst. A multi-kilowatt µCHX device can be achieved by having multiple unit cells with appropriate fluidic distribution headers. The µCHX design is common for both hydrogen storage systems with minor changes. The design of the µCHX is performed using computational fluid dynamics simulations (CFD) at the unit cell and device level. At the unit cell level, the performance is documented using validated CFD simulations for variations in geometric and fluidic parameters. Varied geometric parameters include the length and location of the catalyst bed, length of the device, and the height of the combustion channel. Varied fluidic parameters include the working fluid inlet temperature, flow rates of the working fluid and reactants, and the equivalence ratio of the reactants. Performance is characterized using a global efficiency, heat transfer effectiveness and hydrogen conversion. The parametric variations are captured non-dimensionally as variations in Damkohler and Peclet numbers, which are in turn used to describe the changes in hydrogen conversion and efficiency. Performance maps for hydrogen conversion and pressure drop in the combustion channel are presented based on values of the Damkohler and Peclet numbers and regions of desired operability of the combustor are identified. For the CA µCHX, it is shown that with the help of a novel distributed catalyst arrangement, extinction of the reaction due to the cold gas stream is prevented and hydrogen conversion in excess of 95 percent is… Advisors/Committee Members: Narayanan, Vinod (advisor), Apte, Sourabh (committee member).

Subjects/Keywords: Microchannel; Hydrogen as fuel

…it to a chemical energy source (such as hydrogen) for storage. Desired… …hydrogen in its natural 2 form has very low volumetric energy density, however, as the… …volumetric energy density as liquid hydrogen and do not require high pressures (Figure 2)… …entering a fuel cell. Hydrogen is stored in the adsorbent bed at high pressures (10-240 bar… …used as the hot fluid. For desorption of hydrogen from the bed, significant amount of heat is…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ghazvini, M. (2013). Compact integrated microchannel combustor, recuperator and heat exchanger For hydrogen storage applications. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/43337

Chicago Manual of Style (16^th Edition):

Ghazvini, Mohammad. “Compact integrated microchannel combustor, recuperator and heat exchanger For hydrogen storage applications.” 2013. Doctoral Dissertation, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/43337.

MLA Handbook (7^th Edition):

Ghazvini, Mohammad. “Compact integrated microchannel combustor, recuperator and heat exchanger For hydrogen storage applications.” 2013. Web. 14 Apr 2021.

Vancouver:

Ghazvini M. Compact integrated microchannel combustor, recuperator and heat exchanger For hydrogen storage applications. [Internet] [Doctoral dissertation]. Oregon State University; 2013. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/43337.

Council of Science Editors:

Ghazvini M. Compact integrated microchannel combustor, recuperator and heat exchanger For hydrogen storage applications. [Doctoral Dissertation]. Oregon State University; 2013. Available from: http://hdl.handle.net/1957/43337

21. Luterra, Markael. Metabolic engineering of cyanobacteria to optimize photobiological hydrogen production.

Degree: PhD, Biological and Ecological Engineering, 2014, Oregon State University

URL: http://hdl.handle.net/1957/46797

► Photobiological hydrogen production – the use of photosynthesis to split water into hydrogen and oxygen – presents an opportunity for efficient and large-scale solar biofuel… (more)

Subjects/Keywords: cyanobacteria; Hydrogen as fuel

…CO2 concentrations is effectively removed. As a gas with low solubility, hydrogen readily… …capable of oxidizing hydrogen under atmospheric O2 levels, allowing them to utilize hydrogen as… …surprising, as production of hydrogen in the presence of oxygen represents an energy waste that… …applicable to increasing hydrogen production in eukaryotic algae as well. The primary challenges… …ATPase (ATP synthase) to generate ATP. As hydrogenasemediated hydrogen production…

3 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Luterra, M. (2014). Metabolic engineering of cyanobacteria to optimize photobiological hydrogen production. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/46797

Chicago Manual of Style (16^th Edition):

Luterra, Markael. “Metabolic engineering of cyanobacteria to optimize photobiological hydrogen production.” 2014. Doctoral Dissertation, Oregon State University. Accessed April 14, 2021. http://hdl.handle.net/1957/46797.

MLA Handbook (7^th Edition):

Luterra, Markael. “Metabolic engineering of cyanobacteria to optimize photobiological hydrogen production.” 2014. Web. 14 Apr 2021.

Vancouver:

Luterra M. Metabolic engineering of cyanobacteria to optimize photobiological hydrogen production. [Internet] [Doctoral dissertation]. Oregon State University; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1957/46797.

Council of Science Editors:

Luterra M. Metabolic engineering of cyanobacteria to optimize photobiological hydrogen production. [Doctoral Dissertation]. Oregon State University; 2014. Available from: http://hdl.handle.net/1957/46797

22. Hussy, Ines. Mesophilic fermentative hydrogen production from biomass.

Degree: PhD, 2005, University of South Wales

URL: https://pure.southwales.ac.uk/en/studentthesis/mesophilic-fermentative-hydrogen-production-from-biomass(c099e92e-5777-48e9-bf1f-a1f72d91254e).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434816

► Hydrogen is considered a possible alternative to fossil fuels. Hydrogen can be produced through dark fermentation with 1 mol hexose yielding a maximum of 4… (more)

▼ Hydrogen is considered a possible alternative to fossil fuels. Hydrogen can be produced through dark fermentation with 1 mol hexose yielding a maximum of 4 mol hydrogen in association with acetate production, and 2 mol hydrogen in association with butyrate production. However, an economically and technically feasible process is yet to be established. So far research into fermentative hydrogen production has focused on pure and soluble carbohydrates, particularly glucose. To reduce substrate costs, use of more complex low-cost co- and waste products of the food industry or biomass crops which have undergone minimum pre-treatment would be desirable. Also, whilst much research to date has focused on use of pure bacterial strains, an easily obtainable mixed microflora would be preferable to avoid costs of substrate sterilisation. Therefore this research project focused on fermentative hydrogen production from three abundant (in the UK) low cost substrates, namely a wheat starch co-product, sugarbeet and perennial ryegrass. Anaerobic digester sludge obtained from the local sewage works was used as inoculum in a continuously stirred tank reactor. Production of hydrogen and other fermentation products was measured to gain information about the main metabolic pathways used. To lower hydrogen partial pressure the reactor was sparged with nitrogen and the effect on hydrogen production observed. It was demonstrated that stable fermentative hydrogen production from the wheat starch co-product and sugarbeet water extract was possible in continuous operation. Hydrogen production from grass extract was demonstrated in batch mode. Sparging with nitrogen significantly increased hydrogen yields, by 46% for the wheat starch co-product, by 67% for sugarbeet water extract, and by 184% for ryegrass extract. Maximum yields achieved were 1.9 mol hydrogen per mol hexose converted for 16 days on starch, 1.7 mol per mol hexose converted for 5 days on sugarbeet water extract and 0.8 mol hydrogen per mol hexose converted in batch from grass extract. Therefore up to 48% of the maximum theoretical hydrogen yield was produced. Various factors were identified as preventing higher hydrogen yields. Hydrogen production was more closely related to butyrate than acetate concentration. Also, lactate, ethanol and propionate, which are products of carbohydrate fermenting metabolic pathways that do not produce hydrogen, were detected, as were signs of hydrogen consuming homoacetogenesis in continuous operation.

Subjects/Keywords: 665.81; Hydrogen as fuel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hussy, I. (2005). Mesophilic fermentative hydrogen production from biomass. (Doctoral Dissertation). University of South Wales. Retrieved from https://pure.southwales.ac.uk/en/studentthesis/mesophilic-fermentative-hydrogen-production-from-biomass(c099e92e-5777-48e9-bf1f-a1f72d91254e).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434816

Chicago Manual of Style (16^th Edition):

Hussy, Ines. “Mesophilic fermentative hydrogen production from biomass.” 2005. Doctoral Dissertation, University of South Wales. Accessed April 14, 2021. https://pure.southwales.ac.uk/en/studentthesis/mesophilic-fermentative-hydrogen-production-from-biomass(c099e92e-5777-48e9-bf1f-a1f72d91254e).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434816.

MLA Handbook (7^th Edition):

Hussy, Ines. “Mesophilic fermentative hydrogen production from biomass.” 2005. Web. 14 Apr 2021.

Vancouver:

Hussy I. Mesophilic fermentative hydrogen production from biomass. [Internet] [Doctoral dissertation]. University of South Wales; 2005. [cited 2021 Apr 14]. Available from: https://pure.southwales.ac.uk/en/studentthesis/mesophilic-fermentative-hydrogen-production-from-biomass(c099e92e-5777-48e9-bf1f-a1f72d91254e).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434816.

Council of Science Editors:

Hussy I. Mesophilic fermentative hydrogen production from biomass. [Doctoral Dissertation]. University of South Wales; 2005. Available from: https://pure.southwales.ac.uk/en/studentthesis/mesophilic-fermentative-hydrogen-production-from-biomass(c099e92e-5777-48e9-bf1f-a1f72d91254e).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434816

Florida Atlantic University

23. Zbeeb, Khaled. Investigation of trapped vortex combustion using hydrogen-rich fuels.

Degree: PhD, 2011, Florida Atlantic University

URL: http://purl.flvc.org/FAU/3334096

►

Summary: The combustion process of a fuel is a challenging subject when it comes to analyze its performance and resultant emissions. The main task of… (more)

▼

Summary: The combustion process of a fuel is a challenging subject when it comes to analyze its performance and resultant emissions. The main task of this study is to optimize the selection of a hydrogen-rich fuel based on its performance and emissions. Computational Fluid Dynamics analysis is performed to test the combustion performance and emissions from the vortex trapped combustor when natural gas fuel (methane) is replaced with renewable and alternative fuels such as hydrogen and synthesis gas. Correlation graphs for the trapped vortex combustor performance and NOx, CO, and CO2 emissions for various types of fuels with different compositions and heat of combustion values were established. Methane, Hydrogen and 10 different syngas fuels were analyzed in this study using computational fluid dynamics numerical method. The trapped vortex combustor that represents an efficient and compact combustor for flame stability was investigated. The TVC consists of a fore body and two after body disks . These components are all encircled with a Pyrex tube. The purpose of the after body disks is to create the vortex wakes that will enhance the combustion process and minimize the NOx emissions. The TVC CFD model was validated by comparing the CFD model results using propane fuel with existing experimental results that were established in Rome, Italy. The static temperature distribution and NOx, CO emissions, combustor efficiency and total pressure drop results of the three dimensional CFD model were similar to the experimental data. Effects of H2/CO and H2/CH4 ratios and the mass fraction of each constituent of syngas fuels and Hydrogen-Methane fuel mixture on the TVC performance and emissions were investigated.

Summary: Moreover, the fuel injector Reynolds number and Lower heating values for Methane, Hydrogen and 10 syngas fuels on the TVC performance and emissions were also investigated. Correlation plots for the NOx, CO and CO2 emissions versus the fuel injector Reynolds number and low heating value were established. These correlation curves can be used as a fair design diagram to optimize the fuel selection process for aerospace and electrical power plant applications.

Electronic reproduction. Boca Raton, Fla., 2011.

Subjects/Keywords: Hydrogen as fuel – Research; Combustion chambers; Vortex-motion; Fluid dynamics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zbeeb, K. (2011). Investigation of trapped vortex combustion using hydrogen-rich fuels. (Doctoral Dissertation). Florida Atlantic University. Retrieved from http://purl.flvc.org/FAU/3334096

Chicago Manual of Style (16^th Edition):

Zbeeb, Khaled. “Investigation of trapped vortex combustion using hydrogen-rich fuels.” 2011. Doctoral Dissertation, Florida Atlantic University. Accessed April 14, 2021. http://purl.flvc.org/FAU/3334096.

MLA Handbook (7^th Edition):

Zbeeb, Khaled. “Investigation of trapped vortex combustion using hydrogen-rich fuels.” 2011. Web. 14 Apr 2021.

Vancouver:

Zbeeb K. Investigation of trapped vortex combustion using hydrogen-rich fuels. [Internet] [Doctoral dissertation]. Florida Atlantic University; 2011. [cited 2021 Apr 14]. Available from: http://purl.flvc.org/FAU/3334096.

Council of Science Editors:

Zbeeb K. Investigation of trapped vortex combustion using hydrogen-rich fuels. [Doctoral Dissertation]. Florida Atlantic University; 2011. Available from: http://purl.flvc.org/FAU/3334096

University of Oklahoma

24. Maune, Matthew W. ANAEROBACULUM HYDROGENIFORMANS: INSIGHTS INTO THE NOVEL BIOCHEMICAL AND PHYSIOLOGICAL ABILITY OF A THERMOPHILIC BIOCATALYST THAT CAN UTILIZE BOTH DEFINED AND UNDEFINED SUBSTRATES FOR THE PRODUCTION OF RENEWABLE HYDROGEN ENERGY.

Degree: PhD, 2011, University of Oklahoma

URL: http://hdl.handle.net/11244/320232

► This body of work describes the bacterium Anaerobaculum hydrogeniformans strain OS1, a novel anaerobic, moderately thermophilic, NaCl-requiring fermentative bacterium that was isolated from oil production… (more)

▼ This body of work describes the bacterium Anaerobaculum hydrogeniformans strain OS1, a novel anaerobic, moderately thermophilic, NaCl-requiring fermentative bacterium that was isolated from oil production water collected from Alaska, USA. A. hydrogeniformans produces 4 moles of H2 per mole of glucose. Aside from the characterization of A. hydrogeniformans, production of H2 from undefined wastewaters was also evaluated. An optimal ratio of wastewater to mineral medium was obtained for all feedstocks and used for batch fermentations. Clarified wastewaters resulted in higher H2 yields. This study shows that A. hydrogeniformans can be used to produce H2 from waste feedstocks while significantly reducing COD at values higher that others reported in the literature for pure and mixed cultures as well as electrolytic cells. Determination of the optimal fermentation conditions for A. hydrogeniformans and elucidate limiting factors during glucose fermentation. A. hydrogeniformans grew optimally and produced H2 from 0.2 M to 0.6 M, and tolerated up to 1.2 M NaCl, making it the most NaCl tolerant organism producing approximately 4 H2 per mole of glucose. A. hydrogeniformans was able to grow in the presence of high initial sodium/potassium acetate concentrations. Ionic strength was not responsible for inhibition of growth or product production. Inhibition of total glucose oxidation was affected by a decrease in the culture pH, where by pH adjustment with additional buffer or bicarbonate during growth resulted in total glucose oxidation. Hydrogen removal from the headspace marginally increased glucose utilization and growth rates, but the total H2 production rate was not affected. Glucose was not oxidized totally, in cultures with lowered H2 partial pressures, supporting the hypothesis that increasing H2 partial pressure is not the only limiting factor during fermentation. Growth rate and glucose utilization increased when the concentration of yeast extract was increased in the medium. The physiological pathway for anaerobic glucose oxidation was evaluated. Enzyme activities for the Embden-Meyerhoff-Parnas pathway were all detected. However, Glyceraldehyde-3-phosphate dehydrogenase was not be detected in cell free extracts of A. hydrogeniformans using NAD⁺ or NADP⁺ as electron acceptors. However there was enzyme activity for a glyceraldehyde-3-phosphate oxidoreductase. The oxidation of pyruvate to acetate is accomplished by a pyruvate:oxidoreductase, phosphotransacetylase and acetate kinase. Labeling of the C-1 and C-3 of glucose showed the production of CO2 from the 3-C of glucose and the incorporation of the C-1 of glucose into the methyl position of acetate, which is indicative of the Embden Meyerhof pathway and further confirmed by the detection of key metabolites from glucose grown cultures of A. hydrogeniformans. This is the first report of an eubacterial species that oxidizes glucose to acetate, H2 and CO2 via a ferredoxin dependent pathway, such as that previously thought to only be… Advisors/Committee Members: Tanner, Ralph S (advisor).

Subjects/Keywords: Anaerobic bacteria; Thermophilic bacteria; Hydrogen as fuel; Renewable energy sources

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Maune, M. W. (2011). ANAEROBACULUM HYDROGENIFORMANS: INSIGHTS INTO THE NOVEL BIOCHEMICAL AND PHYSIOLOGICAL ABILITY OF A THERMOPHILIC BIOCATALYST THAT CAN UTILIZE BOTH DEFINED AND UNDEFINED SUBSTRATES FOR THE PRODUCTION OF RENEWABLE HYDROGEN ENERGY. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/320232

Chicago Manual of Style (16^th Edition):

Maune, Matthew W. “ANAEROBACULUM HYDROGENIFORMANS: INSIGHTS INTO THE NOVEL BIOCHEMICAL AND PHYSIOLOGICAL ABILITY OF A THERMOPHILIC BIOCATALYST THAT CAN UTILIZE BOTH DEFINED AND UNDEFINED SUBSTRATES FOR THE PRODUCTION OF RENEWABLE HYDROGEN ENERGY.” 2011. Doctoral Dissertation, University of Oklahoma. Accessed April 14, 2021. http://hdl.handle.net/11244/320232.

MLA Handbook (7^th Edition):

Maune, Matthew W. “ANAEROBACULUM HYDROGENIFORMANS: INSIGHTS INTO THE NOVEL BIOCHEMICAL AND PHYSIOLOGICAL ABILITY OF A THERMOPHILIC BIOCATALYST THAT CAN UTILIZE BOTH DEFINED AND UNDEFINED SUBSTRATES FOR THE PRODUCTION OF RENEWABLE HYDROGEN ENERGY.” 2011. Web. 14 Apr 2021.

Vancouver:

Maune MW. ANAEROBACULUM HYDROGENIFORMANS: INSIGHTS INTO THE NOVEL BIOCHEMICAL AND PHYSIOLOGICAL ABILITY OF A THERMOPHILIC BIOCATALYST THAT CAN UTILIZE BOTH DEFINED AND UNDEFINED SUBSTRATES FOR THE PRODUCTION OF RENEWABLE HYDROGEN ENERGY. [Internet] [Doctoral dissertation]. University of Oklahoma; 2011. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/11244/320232.

Council of Science Editors:

Maune MW. ANAEROBACULUM HYDROGENIFORMANS: INSIGHTS INTO THE NOVEL BIOCHEMICAL AND PHYSIOLOGICAL ABILITY OF A THERMOPHILIC BIOCATALYST THAT CAN UTILIZE BOTH DEFINED AND UNDEFINED SUBSTRATES FOR THE PRODUCTION OF RENEWABLE HYDROGEN ENERGY. [Doctoral Dissertation]. University of Oklahoma; 2011. Available from: http://hdl.handle.net/11244/320232

25. Koh, Katherine. Design and synthesis of nanocatalysts enabling hydrogen storage, release and electrocatalysis.

Degree: PhD, Chemistry and Chemical Biology, 2017, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/55528/

► In light of the given limited available energy resources and the constant increase in energy consumption and demand worldwide, the development of sustainable alternative energy… (more)

▼ In light of the given limited available energy resources and the constant increase in energy consumption and demand worldwide, the development of sustainable alternative energy sources has never become more vital. Among the conceivable renewable energy choices, hydrogen has been considered as one of the most promising energy carrier especially in the fuel-cell technology. Based on the concept of “hydrogen economy”, as coined by Bockris in 1970,1 efficient storage, large-scale production and convenient distribution of hydrogen are of the utmost importance for successful utilization of this energy carrier. One of the most promising strategies to achieve the sustainable hydrogen carriers is through the hydrogenation/dehydrogenation interconversion reactions involving substances such as formic acid (H2 + CO2 HCOOH) or formate (HCO2‾ + H2O HCO3‾ + H2).2 Other reactions that are also important for fuel cell applications are the hydrazine oxidation (HOR), oxygen reduction reaction (ORR), or hydrogen evolution reaction (HER). In this thesis, I reported the design and synthesis of various nanocatalysts for several important fuel cell applications including formic acid dehydrogenation, formate/bicarbonate reversible cycle, and hydrazine oxidation reaction (HOR). In chapter 2, I have developed a facile synthetic route to amine-functionalized nanoporous silica-supported ultrasmall Pd nanoparticles (Pd/SBA-15-Amine) that are proven to be highly active catalysts for formic acid dehydrogenation, producing hydrogen at ambient temperature with a high turn-over-frequency (TOF). The TOF values reported for the materials therein are among the highest TOFs ever reported for the reaction. I have also shown that the catalyst could be easily recyclable multiple times, without losing their catalytic activity. The catalyst may, therefore, contribute to some of the solutions of our current renewable energy and sustainability challenges (by enabling the so-called hydrogen economy). In chapter 3, I have synthesized new types of palladium nanoparticles (Pd NPs) supported on amine-functionalized SBA-15, which have high catalytic activity for formic acid dehydrogenation. In this case, I have also demonstrated the synthesis of SBA-15 mesoporous silica materials grafted with three different amine groups (primary, secondary, and tertiary amine) and the interactions between the Pd NPs and the grafted amine groups to create favorable synergistic catalytic effects toward the reaction. The effects of the different amine types, their grafted density on the chemical and catalytic activities of the supported Pd NPs in formic acid dehydrogenation are then thoroughly investigated using various state-of-the-art characterization techniques. The study has also allowed some understanding of structure-catalytic activity relationship of such catalytic materials. In chapter 4, the formate and bicarbonate reversible reactions are discussed. Those reversible cycle can be used to store, release and allow hydrogen (H2) to serve as an effective energy carrier in… Advisors/Committee Members: Asefa, Tewodros (chair), Li, Jing (internal member), O'Carroll, Deirdre (internal member), Chhowalla, Manish (outside member), School of Graduate Studies.

Subjects/Keywords: Hydrogen as fuel

…only water as a byproduct. Research efforts to consume and apply hydrogen in the fuel cell… …during formic acid’s uses in the fuel cells. To utilize FA as a hydrogen storage and release… …to meet these problems is hydrogen.1 Hydrogen is considered as promising energy source… …practical and sustainable fuel cell. Several attractive alternatives to store and deliver hydrogen… …x29;. Formic acid (FA) is considered as one of the promising chemical hydrogen…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Koh, K. (2017). Design and synthesis of nanocatalysts enabling hydrogen storage, release and electrocatalysis. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/55528/

Chicago Manual of Style (16^th Edition):

Koh, Katherine. “Design and synthesis of nanocatalysts enabling hydrogen storage, release and electrocatalysis.” 2017. Doctoral Dissertation, Rutgers University. Accessed April 14, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/55528/.

MLA Handbook (7^th Edition):

Koh, Katherine. “Design and synthesis of nanocatalysts enabling hydrogen storage, release and electrocatalysis.” 2017. Web. 14 Apr 2021.

Vancouver:

Koh K. Design and synthesis of nanocatalysts enabling hydrogen storage, release and electrocatalysis. [Internet] [Doctoral dissertation]. Rutgers University; 2017. [cited 2021 Apr 14]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/55528/.

Council of Science Editors:

Koh K. Design and synthesis of nanocatalysts enabling hydrogen storage, release and electrocatalysis. [Doctoral Dissertation]. Rutgers University; 2017. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/55528/

Michigan State University

26. Cornish, Adam. [FeFe]-hydrogenase substrate transport mechanisms and investigation of algal hydrogen metabolism.

Degree: 2012, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:241

►

Thesis Ph. D. Michigan State University. Biochemistry and Molecular Biology 2012.

The global population has recently exceeded 7 billion people and the demand for energy… (more)

▼

Thesis Ph. D. Michigan State University. Biochemistry and Molecular Biology 2012.

The global population has recently exceeded 7 billion people and the demand for energy continues to expand as the number of industrialized countries grows. Currently, the energy economy is dominated by the utilization of polluting and non-renewable fossil fuels. Both the collection and use of petroleum-based fuels is destructive to the environment and is not sustainable over a long time-scale, which justifies the investigation into the development of renewable, alternative fuels. Of the various fuels that have been proposed, molecular hydrogen (H₂) in particular holds great promise as a clean-burning fuel capable of supplementing the current energy economy, especially as the combustion of H₂ generates only water vapor as by-product. H₂ can be generated via a number of chemical processes, but current H₂ technologies either require fossil fuels as inputs or are energy-inefficient. The biological production of H₂, however, has garnered a great deal of interest because microorganisms are able to drive H₂ synthesis using energy derived from both light and dark fermentative metabolisms. This manner of production does not depend on mining non-renewable resources and microbes can be cultured at the industrial scale without competing with arable land needed for agriculture. H₂ evolution in these microorganisms is dependent on nitrogenases and/or hydrogenases, enzymes which utilize unique metal centers for catalysis. Hydrogenases have been of particular interest for industrial-scale H₂ production because these enzymes are found in a diverse array of organisms and require only protons and electrons as substrates. In particular, [FeFe]-hydrogenases have very high turnover numbers and catalysis can be coupled to photosynthesis. Unfortunately, these enzymes are inactivated by molecular oxygen (O₂), and a number of studies have therefore attempted to engineer O₂-tolerant hydrogenases. However, engineering enzymes to introduce optimal qualities has been impeded by an incomplete understanding of the overall reaction mechanism. Substrate (protons, electrons, and ₂) transport is essential to hydrogenase activity, yet relatively little information is available regarding the intraprotein transport of substrate in [FeFe]-hydrogenase. I focused my investigation on identifying and testing pathways important for substrate transport between the enzyme surface and the active site in the Clostridium pasteurianum [FeFe]-hydrogenase. I have elucidated a key pathway for proton transport and confirmed that two iron-sulfur clusters are essential in an electron transfer relay, contributing to the overall characterization of [FeFe]-hydrogenase activity. Green algae utilize [FeFe]-hydrogenases to catalyze H₂ production using reducing equivalents derived from photosynthesis and these enzymes are an integral component of anaerobic metabolism…

Advisors/Committee Members: Hegg, Eric L, Reguera, Gemma, Hausinger, Robert, Hoogstraten, Charles, Ferguson-Miller, Shelagh.

Subjects/Keywords: Hydrogenase; Green algae; Enzymology; Hydrogen as fuel – Research; Biochemistry

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cornish, A. (2012). [FeFe]-hydrogenase substrate transport mechanisms and investigation of algal hydrogen metabolism. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:241

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cornish, Adam. “[FeFe]-hydrogenase substrate transport mechanisms and investigation of algal hydrogen metabolism.” 2012. Thesis, Michigan State University. Accessed April 14, 2021. http://etd.lib.msu.edu/islandora/object/etd:241.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cornish, Adam. “[FeFe]-hydrogenase substrate transport mechanisms and investigation of algal hydrogen metabolism.” 2012. Web. 14 Apr 2021.

Vancouver:

Cornish A. [FeFe]-hydrogenase substrate transport mechanisms and investigation of algal hydrogen metabolism. [Internet] [Thesis]. Michigan State University; 2012. [cited 2021 Apr 14]. Available from: http://etd.lib.msu.edu/islandora/object/etd:241.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cornish A. [FeFe]-hydrogenase substrate transport mechanisms and investigation of algal hydrogen metabolism. [Thesis]. Michigan State University; 2012. Available from: http://etd.lib.msu.edu/islandora/object/etd:241

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan State University

27. Zandi, Omid. Understanding and optimizing hematite photoelectrodes for photoelectrochemical water splitting.

Degree: 2015, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:3800

►

Thesis Ph. D. Michigan State University. Chemistry 2015

The quest for carbon-neutral renewable energy to relax our reliance on the fossil fuels in the future… (more)

▼

Thesis Ph. D. Michigan State University. Chemistry 2015

The quest for carbon-neutral renewable energy to relax our reliance on the fossil fuels in the future has been the subject of extensive research. Among all the options, sunlight by far provides the most abundant and globally well-distributed source of energy. Capturing less than 1% of the sunlight energy illuminating the earth can entirely satisfy the world’s energy demand. This work is thus focused on realizing hematite as an electrode material for solar water oxidation in a photoelectrochemical cell which produces clean burning, energy dense, hydrogen fuel. A combination of sunlight, water and earth abundant hematite, thus provides an essentially unlimited resource to produce solar hydrogen fuel. Despite several attractive properties of hematite e.g. good light absorption, proper energy levels and stability, the experimental performances measured to date have fallen well short of the theoretical expectations. The poor performance has been generally attributed to recombination processes which limit charge separation and collection on this material. Consequently, a large input voltage is required to oxidize water on hematite, which is a major loss of efficiency. In this work hematite thin films papered by atomic layer deposition were systematically investigated under solar-driven water oxidation. A combination of electrochemical and photoelectrochemical, spectroscopic, and microscopic analysis were employed to better understand the fundamental mechanisms behind the poor performance. Performance enchantment strategies were then developed and successfully employed to boost the water oxidation performance of the electrodes. For example, substrate modification was shown that enables the deposition of highly crystalline hematite which reduces bulk recombination. The surface recombination on the other hand, was eliminated by a combination of high temperature annealing and addition of catalysts. Finally a simple and universal electrodeposition method was established to deposit highly active hematite photoelectrodes, providing a promising route to achieve efficient water splitting using this material.

Online resource;

Advisors/Committee Members: Hamann, Thomas W, McCusker, James, Beaulac, Remi, Poltavets, Viktor.

Subjects/Keywords: Hematite; Water – Electrolysis; Hydrogen as fuel; Photoelectrochemistry; Chemistry

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zandi, O. (2015). Understanding and optimizing hematite photoelectrodes for photoelectrochemical water splitting. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:3800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zandi, Omid. “Understanding and optimizing hematite photoelectrodes for photoelectrochemical water splitting.” 2015. Thesis, Michigan State University. Accessed April 14, 2021. http://etd.lib.msu.edu/islandora/object/etd:3800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zandi, Omid. “Understanding and optimizing hematite photoelectrodes for photoelectrochemical water splitting.” 2015. Web. 14 Apr 2021.

Vancouver:

Zandi O. Understanding and optimizing hematite photoelectrodes for photoelectrochemical water splitting. [Internet] [Thesis]. Michigan State University; 2015. [cited 2021 Apr 14]. Available from: http://etd.lib.msu.edu/islandora/object/etd:3800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zandi O. Understanding and optimizing hematite photoelectrodes for photoelectrochemical water splitting. [Thesis]. Michigan State University; 2015. Available from: http://etd.lib.msu.edu/islandora/object/etd:3800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Poleto, Liliane. Isolamento e identificação de microrganismos produtores de hidrogênio a partir do glicerol residual.

Degree: 2014, Universidade de Caxias do Sul

URL: https://repositorio.ucs.br/handle/11338/883

►

Um dos grandes desafios para os próximos anos é desenvolver alternativas de produção para energias sustentáveis. O biodiesel vem se posicionando como uma opção para… (more)

▼

Um dos grandes desafios para os próximos anos é desenvolver alternativas de produção para energias sustentáveis. O biodiesel vem se posicionando como uma opção para a substituição dos combustíveis fósseis. Sua produção se dá pela transesterificação entre uma gordura e um monoálcool, liberando glicerol, que corresponde a 10% do volume da reação. Grandes incrementos na produção de biodisel resultarão em volumes proporcionais de glicerol residual. Estudos têm mostrado que bactérias anaeróbias estritas e bactérias fermentativas são capazes de produzir hidrogênio, um combustível de alto valor energético, que não gera gases poluentes durante a sua queima. Visto a importância de aumentar o valor agregado do glicerol residual, o presente trabalho teve como objetivo isolar e identificar por técnicas moleculares, bactérias presentes em lodos de estações de tratamento de resíduos, capazes de produzir hidrogênio utilizando glicerol residual da indústria de biodiesel como fonte de carbono. As amostras foram submetidas a choque térmico para eliminação de bactérias hidrogenotróficas, crescidas em meio contendo glicerol em condições de anaerobiose e analisadas para a formação de hidrogênio. Foram identificadas por sequenciamento do gene 16S rRNA, quinze espécies bacterianas capazes de crescer em meio com glicerol, sendo que destas nove apresentaram capacidade de produção de hidrogênio, correspondendo a Enterobacter ludwigii, Shigella sonnei, Bacillus licheniformis, Bacillus amyloliquefaciens, Staphylococcus warneri, Alcaligenes faecalis, Bacillus subtilis, Bacillus atrophaeus e Citrobacter freundii. Os isolados de Bacillus amyloliquefaciens mostraram maior rendimento na produção de hidrogênio com valores de 0,50±0,20 mol H2/mol de glicerol, utilizando o meio enriquecido com 1,5% de glicerol residual. Adicionalmente, foi realizada análise de BLAST para verificar a presença dos genes HycC, HycE, HycF, HyfC, HyfF e HyfH relacionados à produção de hidrogênio. Este estudo foi desenvolvido utilizando apenas os microrganismos do gênero Bacillus, uma vez que, dentre os microrganismos isolados, apenas os Bacillus apresentam sequenciamento completo disponível na rede de bioinformática. Foi verificado que B. amyloliquefaciens, B. licheniformis e B. artrophaeus não possuem os genes específicos analisados, mas estes genes possuem similaridade com outros genes e proteínas que parecem desempenhar funções no transporte de hidrogênio para exterior da célula. Os resultados indicam que existe um grande potencial para a seleção de bactérias produtoras de hidrogênio nos efluentes avaliados que são capazes de metabolizar o glicerol residual com a geração de hidrogênio, como combustível de energia renovável.

One of the major challenges for the coming years is to develop alternative forms of production for sustainable energy. The biodiesel is positioning itself as an option for the replacement of fossil fuels. Its production is by transesterification between a fat and a monoalcohol, releasing glycerol, which corresponds to 10% of the volume of the…

Advisors/Committee Members: Paesi, Suelen Osmarina, Camassola, Marli, Echeverrigaray, Sérgio, Etchebehere, Claudia.

Subjects/Keywords: Biocombustíveis; Hidrogênio como combustível; Biodiesel; Microorganismos; Biofuels; Hydrogen as fuel; Biodiesel fuels; Microorganisms

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Poleto, L. (2014). Isolamento e identificação de microrganismos produtores de hidrogênio a partir do glicerol residual. (Masters Thesis). Universidade de Caxias do Sul. Retrieved from https://repositorio.ucs.br/handle/11338/883

Chicago Manual of Style (16^th Edition):

Poleto, Liliane. “Isolamento e identificação de microrganismos produtores de hidrogênio a partir do glicerol residual.” 2014. Masters Thesis, Universidade de Caxias do Sul. Accessed April 14, 2021. https://repositorio.ucs.br/handle/11338/883.

MLA Handbook (7^th Edition):

Poleto, Liliane. “Isolamento e identificação de microrganismos produtores de hidrogênio a partir do glicerol residual.” 2014. Web. 14 Apr 2021.

Vancouver:

Poleto L. Isolamento e identificação de microrganismos produtores de hidrogênio a partir do glicerol residual. [Internet] [Masters thesis]. Universidade de Caxias do Sul; 2014. [cited 2021 Apr 14]. Available from: https://repositorio.ucs.br/handle/11338/883.

Council of Science Editors:

Poleto L. Isolamento e identificação de microrganismos produtores de hidrogênio a partir do glicerol residual. [Masters Thesis]. Universidade de Caxias do Sul; 2014. Available from: https://repositorio.ucs.br/handle/11338/883

Hong Kong University of Science and Technology

29. Zhang, Lulu CBME. Advanced electrocatalysts for hydrogen evolution reaction.

Degree: 2018, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-99710 ; https://doi.org/10.14711/thesis-991012633567003412 ; http://repository.ust.hk/ir/bitstream/1783.1-99710/1/th_redirect.html

► Hydrogen is a clean energy carrier that has all criteria considered for an alternative energy source. One of promising ways to store intermittent and renewable… (more)

▼ Hydrogen is a clean energy carrier that has all criteria considered for an alternative energy source. One of promising ways to store intermittent and renewable energy sources is producing hydrogen by water splitting. One of the main issues in water splitting is the requirement of highly cost electrocatalysts such as Pt for hydrogen evolution reaction (HER). The development of cost-effective, sustainable and efficient catalysts for HER is of significance. To reach this goal, various types of materials were explored in this work including the transition metal and nitrogen co-doped composites (Co-N-C), Fe₃C encapsulated in N-doped carbon nanotubes (Fe₃[email protected]), Co nanoparticles encapsulated in N-doped electrospun carbon nanofibers (Co-PAN) as well as the Pd-based catalysts. Their catalytic activities for HER were evaluated and compared with the commercial Pt/C catalyst. All these materials were very active for HER in both acidic and alkaline solutions. The overpotential at current density of 10 mA cm^-2 for noble metal-free catalysts were 235 mV for Co-N-C, 154 mV for Fe₃[email protected] and 159 mV for Co-PAN which were lower than most of non-precious metal based- and metal free catalysts. According to our DFT calculation results, the transition metal and N-doped carbon played important roles in improving their catalytic activities. Specifically, the active sites for Co-N-C could be related to Me/N/C moieties. The synergistic effect between the Fe₃C and N-doped CNTs is the main reason for improving its catalytic activity by weakening the H adsorption energy. The Pd₃Ru alloy thermal annealed at 300˚C showed excellent catalytic activity for HER that was even higher than Pt in alkaline solutions. This makes PdRu alloys a potential substitution for Pt. DFT calculation results indicated that the hydrogen binding energy on Pd₃Ru alloy was weaker than Pd. This work gives guidance to develop more efficient and cost-effective catalysts for HER, as well as other reactions.

Subjects/Keywords: Electrocatalysis ; Electrolytic reduction ; Hydrogen as fuel ; Transition metal nitrides ; Transition metal compounds

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, L. C. (2018). Advanced electrocatalysts for hydrogen evolution reaction. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-99710 ; https://doi.org/10.14711/thesis-991012633567003412 ; http://repository.ust.hk/ir/bitstream/1783.1-99710/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Lulu CBME. “Advanced electrocatalysts for hydrogen evolution reaction.” 2018. Thesis, Hong Kong University of Science and Technology. Accessed April 14, 2021. http://repository.ust.hk/ir/Record/1783.1-99710 ; https://doi.org/10.14711/thesis-991012633567003412 ; http://repository.ust.hk/ir/bitstream/1783.1-99710/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Lulu CBME. “Advanced electrocatalysts for hydrogen evolution reaction.” 2018. Web. 14 Apr 2021.

Vancouver:

Zhang LC. Advanced electrocatalysts for hydrogen evolution reaction. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2018. [cited 2021 Apr 14]. Available from: http://repository.ust.hk/ir/Record/1783.1-99710 ; https://doi.org/10.14711/thesis-991012633567003412 ; http://repository.ust.hk/ir/bitstream/1783.1-99710/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang LC. Advanced electrocatalysts for hydrogen evolution reaction. [Thesis]. Hong Kong University of Science and Technology; 2018. Available from: http://repository.ust.hk/ir/Record/1783.1-99710 ; https://doi.org/10.14711/thesis-991012633567003412 ; http://repository.ust.hk/ir/bitstream/1783.1-99710/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Aberdeen

30. Angelis, Yerasimos. Quantification of environmentally sensitive emissions by substitution of traditional internal combustion (IC) technology with hydrogen fuelled IC engines.

Degree: School of Biological Sciences., 2007, University of Aberdeen

URL: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26222 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=26222&custom_att_2=simple_viewer

Subjects/Keywords: Hydrogen as fuel.; Internal combustion engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Angelis, Y. (2007). Quantification of environmentally sensitive emissions by substitution of traditional internal combustion (IC) technology with hydrogen fuelled IC engines. (Doctoral Dissertation). University of Aberdeen. Retrieved from http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26222 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=26222&custom_att_2=simple_viewer

Chicago Manual of Style (16^th Edition):

Angelis, Yerasimos. “Quantification of environmentally sensitive emissions by substitution of traditional internal combustion (IC) technology with hydrogen fuelled IC engines.” 2007. Doctoral Dissertation, University of Aberdeen. Accessed April 14, 2021. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26222 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=26222&custom_att_2=simple_viewer.

MLA Handbook (7^th Edition):

Angelis, Yerasimos. “Quantification of environmentally sensitive emissions by substitution of traditional internal combustion (IC) technology with hydrogen fuelled IC engines.” 2007. Web. 14 Apr 2021.

Vancouver:

Angelis Y. Quantification of environmentally sensitive emissions by substitution of traditional internal combustion (IC) technology with hydrogen fuelled IC engines. [Internet] [Doctoral dissertation]. University of Aberdeen; 2007. [cited 2021 Apr 14]. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26222 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=26222&custom_att_2=simple_viewer.

Council of Science Editors:

Angelis Y. Quantification of environmentally sensitive emissions by substitution of traditional internal combustion (IC) technology with hydrogen fuelled IC engines. [Doctoral Dissertation]. University of Aberdeen; 2007. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26222 ; http://digitool.abdn.ac.uk:1801/webclient/DeliveryManager?pid=26222&custom_att_2=simple_viewer

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations