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You searched for subject:(Steam reformation). Showing records 1 – 3 of 3 total matches.

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Florida International University

1. Kumar, Sushant. Clean Hydrogen Production and Carbon dioxide Capture Methods.

Degree: PhD, Materials Science and Engineering, 2013, Florida International University

Fossil fuels constitute a significant fraction of the world’s energy demand. The burning of fossil fuels emits huge amounts of carbon dioxide into the atmosphere. Therefore, the limited availability of fossil fuel resources and the environmental impact of their use require a change to alternative energy sources or carriers (such as hydrogen) in the foreseeable future. The development of methods to mitigate carbon dioxide emission into the atmosphere is equally important. Hence, extensive research has been carried out on the development of cost-effective technologies for carbon dioxide capture and techniques to establish hydrogen economy. Hydrogen is a clean energy fuel with a very high specific energy content of about 120MJ/kg and an energy density of 10Wh/kg. However, its potential is limited by the lack of environment-friendly production methods and a suitable storage medium. Conventional hydrogen production methods such as Steam-methane-reformation and Coal-gasification were modified by the inclusion of NaOH. The modified methods are thermodynamically more favorable and can be regarded as near-zero emission production routes. Further, suitable catalysts were employed to accelerate the proposed NaOH-assisted reactions and a relation between reaction yield and catalyst size has been established. A 1:1:1 molar mixture of LiAlH4, NaNH2 and MgH2 were investigated as a potential hydrogen storage medium. The hydrogen desorption mechanism was explored using in-situ XRD and Raman Spectroscopy. Mesoporous metal oxides were assessed for CO2 capture at both power and non-power sectors. A 96.96% of mesoporous MgO (325 mesh size, surface area = 95.08 ± 1.5 m2/g) was converted to MgCO3 at 350°C and 10 bars CO2. But the absorption capacity of 1h ball milled zinc oxide was low, 0.198 gCO2 /gZnO at 75°C and 10 bars CO2. Interestingly, 57% mass conversion of Fe and Fe3O4 mixture to FeCO3 was observed at 200°C and 10 bars CO2. MgO, ZnO and Fe3O4 could be completely regenerated at 550°C, 250°C and 350°C respectively. Furthermore, the possible retrofit of MgO and a mixture of Fe and Fe3O4 to a 300 MWe coal-fired power plant and iron making industry were also evaluated. Advisors/Committee Members: Surendra K. Saxena, Arvind Agarwal, Jiuhua Chen, Chunlei Wang, Krish Jayachandran.

Subjects/Keywords: Fossil fuels; global warming; steam methane reformation; coal gasification; hydrogen; carbon dioxide capture; energy penalty; hydrogen storage; hydrides; Other Materials Science and Engineering

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APA (6th Edition):

Kumar, S. (2013). Clean Hydrogen Production and Carbon dioxide Capture Methods. (Doctoral Dissertation). Florida International University. Retrieved from http://digitalcommons.fiu.edu/etd/1039 ; 10.25148/etd.FI13120609 ; FI13120609

Chicago Manual of Style (16th Edition):

Kumar, Sushant. “Clean Hydrogen Production and Carbon dioxide Capture Methods.” 2013. Doctoral Dissertation, Florida International University. Accessed October 19, 2019. http://digitalcommons.fiu.edu/etd/1039 ; 10.25148/etd.FI13120609 ; FI13120609.

MLA Handbook (7th Edition):

Kumar, Sushant. “Clean Hydrogen Production and Carbon dioxide Capture Methods.” 2013. Web. 19 Oct 2019.

Vancouver:

Kumar S. Clean Hydrogen Production and Carbon dioxide Capture Methods. [Internet] [Doctoral dissertation]. Florida International University; 2013. [cited 2019 Oct 19]. Available from: http://digitalcommons.fiu.edu/etd/1039 ; 10.25148/etd.FI13120609 ; FI13120609.

Council of Science Editors:

Kumar S. Clean Hydrogen Production and Carbon dioxide Capture Methods. [Doctoral Dissertation]. Florida International University; 2013. Available from: http://digitalcommons.fiu.edu/etd/1039 ; 10.25148/etd.FI13120609 ; FI13120609


Georgia Tech

2. Zhang, Ling. Sunlight Ancient and Modern: the Relative Energy Efficiency of Hydrogen from Coal and Current Biomass.

Degree: MS, Chemical Engineering, 2004, Georgia Tech

The significance of hydrogen production is increasing as fossil fuels are being depleted and energy security is of increasing importance to the United States. Furthermore, its production offers the potential to alleviate concerns regarding global warming and air pollution. In this thesis we focused on examining the efficiency of hydrogen production from current biomass compared to that from fossil fuel coal. We explored the efficiencies of maximum hydrogen production from biomass and from coal under current technology, namely coal gasification and biomass pyrolysis, together with following-up technologies such as steam reforming (SR). Bio-oil, product from pyrolysis and precursor for steam reforming, is hard to define. We proposed a simulation tool to estimate the pyrolytic bio-oil composition from various biomasses. The results helped us understand the accuracy that is needed for bio-oil composition prediction in the case it is converted to hydrogen. Hydrogen production is energy intensive. Therefore, heat integration is necessary to raise the overall thermodynamic efficiencies for both coal gasification and biomass pyrolysis. The results showed that considering the ultimate energy source, sunlight, about 6-fold more sunlight would be required for the coal to hydrogen than that for biomass to hydrogen. The main difference is in the efficiency of conversion of the ancient biomass to coal and therefore, for modern mankind, this loss has already been incurred. Advisors/Committee Members: Realff, Matthew (Committee Chair), Jones, Christopher (Committee Member), Teja, Amyn (Committee Member), White, David (Committee Member).

Subjects/Keywords: Biomass; Coal; Pyrolysis; Gasification; Steam reformation; Hydrogen production; Sunlight; Heat integration; Biomass energy; Coal gasification; Hydrogen as fuel; Pyrolysis

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APA (6th Edition):

Zhang, L. (2004). Sunlight Ancient and Modern: the Relative Energy Efficiency of Hydrogen from Coal and Current Biomass. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/4786

Chicago Manual of Style (16th Edition):

Zhang, Ling. “Sunlight Ancient and Modern: the Relative Energy Efficiency of Hydrogen from Coal and Current Biomass.” 2004. Masters Thesis, Georgia Tech. Accessed October 19, 2019. http://hdl.handle.net/1853/4786.

MLA Handbook (7th Edition):

Zhang, Ling. “Sunlight Ancient and Modern: the Relative Energy Efficiency of Hydrogen from Coal and Current Biomass.” 2004. Web. 19 Oct 2019.

Vancouver:

Zhang L. Sunlight Ancient and Modern: the Relative Energy Efficiency of Hydrogen from Coal and Current Biomass. [Internet] [Masters thesis]. Georgia Tech; 2004. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/1853/4786.

Council of Science Editors:

Zhang L. Sunlight Ancient and Modern: the Relative Energy Efficiency of Hydrogen from Coal and Current Biomass. [Masters Thesis]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/4786


University of Florida

3. Vergis, Midhun T. Economics of Steam Methane Reformation and Coal Gasification for Hydrogen Production.

Degree: MS, Mechanical Engineering - Mechanical and Aerospace Engineering, 2007, University of Florida

Fossil fuels (especially petroleum) drive today's leading economies. However, soon that age will decline, and we will need alternatives less detrimental to our environment. Hydrogen continues to be one of the most promising, talked about energy carriers of the future. Cost-effective, more environmental friendly methods of producing hydrogen need to be commercially established. In addition storage and transportation continue to remain dominant hurdles that need to be improved. We performed an economic comparison of two methods for producing hydrogen commercially (steam methane reformation and coal gasification)to reach a solution that will most benefit future generations. ( en ) Advisors/Committee Members: Sherif, Sherif A. (committee chair), Ingley, Herbert A. (committee member), Lear, William E. (committee member).

Subjects/Keywords: Capital costs; Carbon dioxide; Coal; Cost estimates; Gasification; Hydrogen; Methane; Natural gas; Steam; Synthesis gas; carlo, coal, dcfror, dpbp, economics, gasification, hydrogen, methane, monte, npv, reformation, simulation, smr, stem

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

APA (6th Edition):

Vergis, M. T. (2007). Economics of Steam Methane Reformation and Coal Gasification for Hydrogen Production. (Masters Thesis). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0021134

Chicago Manual of Style (16th Edition):

Vergis, Midhun T. “Economics of Steam Methane Reformation and Coal Gasification for Hydrogen Production.” 2007. Masters Thesis, University of Florida. Accessed October 19, 2019. http://ufdc.ufl.edu/UFE0021134.

MLA Handbook (7th Edition):

Vergis, Midhun T. “Economics of Steam Methane Reformation and Coal Gasification for Hydrogen Production.” 2007. Web. 19 Oct 2019.

Vancouver:

Vergis MT. Economics of Steam Methane Reformation and Coal Gasification for Hydrogen Production. [Internet] [Masters thesis]. University of Florida; 2007. [cited 2019 Oct 19]. Available from: http://ufdc.ufl.edu/UFE0021134.

Council of Science Editors:

Vergis MT. Economics of Steam Methane Reformation and Coal Gasification for Hydrogen Production. [Masters Thesis]. University of Florida; 2007. Available from: http://ufdc.ufl.edu/UFE0021134

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