subject:(Co ZSM 5)

University of Newcastle

1. Khan, Naseer Ahmed. Selective oxidation of methane with nitrous oxide over cobalt catalyst.

Degree: PhD, 2016, University of Newcastle

URL: http://hdl.handle.net/1959.13/1312052

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Research Doctorate - Doctor of Philosophy (PhD)

In spite of the highly fluctuating oil prices seen over the past number of years, the availability of… (more)

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Research Doctorate - Doctor of Philosophy (PhD)

In spite of the highly fluctuating oil prices seen over the past number of years, the availability of relatively inexpensive sources of liquid hydrocarbons is diminishing, and the development of economically and environmentally viable alternative technologies to supply these hydrocarbons is vital. Projecting into the short and mid-term futures, the world economy is expected to continue to depend on hydrocarbon resources for stability, and thus technologies to produce these resources are important. Synthesis gas (CO and H₂), can be produced from a number of sources and feedstocks, such as biomass, waste and natural gas, and synthesis gas can be converted into liquid fuels such as hydrocarbons and alcohols, which are currently produced in large quantities in the conventional petrochemical industry. The selective oxidation of hydrocarbons, and in particular natural gas of which CH₄ the primary constituent, is notoriously difficult to control, mainly due to propensity of the reaction to generate to products of complete combustion. N₂O is a potent greenhouse gas (CO₂(e) = 300) and its concentration in the atmosphere is continuously increasing [Lee, Ryu et al, International Journal of Greenhouse Gas Control, January 2011, Pages 167–176]. Despite its greenhouse gas notoriety, N₂O is also recognised as a more selective oxidant than O₂ and has been used to selectively oxidise CH₄ to produce valuable products including synthesis gas. The production of synthesis gas, via its reaction with N₂O could be beneficial environmentally, as it could be used to provide valuable products when used to reaction with natural gas. The main aim of this research work is to investigate the scope of selective oxidation of natural gas (mainly CH₄) with N₂O over cobalt catalysts. The catalytic work was carried out in a continuous flow fixed bed micro reactor. Catalysts were prepared according to literature methods, as well as a new novel deposition method. The techniques used for catalyst characterization were powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), In situ Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption/desorption isotherms, temperature program desorption (TPD), chemisorption, transmission electron microscopy (TEM). The elemental composition of catalyst samples was determined by using inductively coupled plasma optical emission spectrometer (ICP-OES). Based upon the experimental results obtained, the oxidation of CH₄ with N₂O over cobalt exchanged ZSM-5 (Co-ZSM-5) catalyst produced synthesis gas at a relatively high yield (19 %). When O₂ (instead of N₂O) was used as an oxidant over Co-ZSM-5 catalyst, synthesis gas was not formed. Similarly, when CH₄ and N₂O reacted over a cobalt on alumina catalyst, synthesis gas was not produced. Interestingly, H₂ was not detected as a reaction product when CH₄ with N₂O reacted over a Fe-ZSM-5 catalyst and only CO_x and H₂O were formed. The effect of the molar feed ratio (N₂O/CH₄ = 1, 3, and 5) was…

Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.

Subjects/Keywords: CH₄; N₂O; Co-ZSM-5

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

APA (6^th Edition):

Khan, N. A. (2016). Selective oxidation of methane with nitrous oxide over cobalt catalyst. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1312052

Chicago Manual of Style (16^th Edition):

Khan, Naseer Ahmed. “Selective oxidation of methane with nitrous oxide over cobalt catalyst.” 2016. Doctoral Dissertation, University of Newcastle. Accessed March 06, 2021. http://hdl.handle.net/1959.13/1312052.

MLA Handbook (7^th Edition):

Khan, Naseer Ahmed. “Selective oxidation of methane with nitrous oxide over cobalt catalyst.” 2016. Web. 06 Mar 2021.

Vancouver:

Khan NA. Selective oxidation of methane with nitrous oxide over cobalt catalyst. [Internet] [Doctoral dissertation]. University of Newcastle; 2016. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1959.13/1312052.

Council of Science Editors:

Khan NA. Selective oxidation of methane with nitrous oxide over cobalt catalyst. [Doctoral Dissertation]. University of Newcastle; 2016. Available from: http://hdl.handle.net/1959.13/1312052

2. Juliana Esteves Fernandes. Catalisadores Cu-, Co- ou Fe-ZSM-5 caracterização e avaliação na redução de NO a N2 com hidrocarbonetos na presença ou ausência de vapor de água.

Degree: 2005, Universidade Federal de São Carlos

URL: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=591

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A minimização das emissões de óxidos de nitrogênio (NOx) na atmosfera tem sido um dos grandes desafios da área de proteção ambiental. Dentre os processos… (more)

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A minimização das emissões de óxidos de nitrogênio (NOx) na atmosfera tem sido um dos grandes desafios da área de proteção ambiental. Dentre os processos para o tratamento dos NOx possíveis, a redução catalítica seletiva do NO com hidrocarbonetos (RCS-HC) vem apresentando excelentes perspectivas. Para este processo os catalisadores metal/zeólita ZSM-5 possuem adequados níveis de conversão em condições oxidantes. Dentro deste contexto, este trabalho teve como objetivo preparar catalisadores Cu, Co e FeZSM-5. As amostras foram caracterizadas por DRX, DRS-UVVIS, FTIR, RTP-H2, MEV e sua atividade verificada através da redução de NO a N2 com propano ou metano em atmosfera oxidante, na presença ou ausência de vapor de água. Os resultados de RTP-H2 mostraram que as espécies presentes nos catalisadores Cu, Co e FeZSM-5, após ativação térmica, foram principalmente os cátions Cu2+ (Cuα 2+ e Cuβ 2+), Co2+ e Fe3+ compensando carga na zeólita, respectivamente. A partir de FTIR e DRS-UVVIS foi possível, também, identificar espécies oxidas, as quais estavam presentes em teores menores. Na redução de NO a N2 na ausência de vapor de água os catalisadores CuZSM-5 apresentaram maiores conversões de NO que os contendo Fe ou Co. Entretanto, os catalisadores FeZSM-5 apresentaram, nessa condição, atividade em temperaturas menores, o que mostra uma vantagem para o seu uso prático. Na presença de vapor de água, verificou-se uma maior queda da atividade no catalisador CuZSM-5, somente recuperada com a retirada desse composto na alimentação, sendo que para os catalisadores CoZSM-5 e FeZSM-5 a perda de atividade foi parcialmente recuperada ao longo do tempo.

The minimization of the emissions of nitrogen oxides (NOx) in the atmosphere has been one of the great goals in the area of environmental protection. Among the possible processes to treat the NOx, the selective catalytic reduction of NO with hydrocarbons (SCR-HC) has presented important expectations. For this process, the metal/ZSM-5 type catalysts have appropriate levels of conversion in oxidative conditions. In this context, the aim of this work was to prepare Cu, Co and FeZSM-5 catalysts. The samples were characterized by XRD, DRS-UVVIS, FTIR, H2-TPR, SEM and tested in the reduction of NO to N2 with propane or methane in oxidative atmosphere in the presence or absence of water steam. The H2-TPR data showed that the cationic species present in the prepared Cu, Co and FeZSM-5 catalysts, after thermal activation, were mainly Cu2+ (Cuα 2+ e Cuβ 2+), Co2+ and Fe3+ cations located in charge compensation sites in the zeolite, respectively. From FTIR and DRS-UVVIS it was also possible identify oxide species, which were present in a lower content. In the reduction of NO to N2 in the absence of water steam, the CuZSM-5 catalysts showed higher levels of conversion of NO than those based in Co and Fe. However, the FeZSM-5 catalysts showed, in this condition, activity at lower temperatures. This behavior makes them potentially interesting to be applied for practical purposes.…

Advisors/Committee Members: Ernesto Antonio Urquieta-González.

Subjects/Keywords: ENGENHARIA QUIMICA; Catalisadores; Redução de NO; Catalisador Cu/ZSM-5; Catalisador Fe/ZSM-5; Catalisador Co/ZSM-5

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

APA (6^th Edition):

Fernandes, J. E. (2005). Catalisadores Cu-, Co- ou Fe-ZSM-5 caracterização e avaliação na redução de NO a N2 com hidrocarbonetos na presença ou ausência de vapor de água. (Thesis). Universidade Federal de São Carlos. Retrieved from http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=591

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):

Fernandes, Juliana Esteves. “Catalisadores Cu-, Co- ou Fe-ZSM-5 caracterização e avaliação na redução de NO a N2 com hidrocarbonetos na presença ou ausência de vapor de água.” 2005. Thesis, Universidade Federal de São Carlos. Accessed March 06, 2021. http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=591.

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

MLA Handbook (7^th Edition):

Fernandes, Juliana Esteves. “Catalisadores Cu-, Co- ou Fe-ZSM-5 caracterização e avaliação na redução de NO a N2 com hidrocarbonetos na presença ou ausência de vapor de água.” 2005. Web. 06 Mar 2021.

Vancouver:

Fernandes JE. Catalisadores Cu-, Co- ou Fe-ZSM-5 caracterização e avaliação na redução de NO a N2 com hidrocarbonetos na presença ou ausência de vapor de água. [Internet] [Thesis]. Universidade Federal de São Carlos; 2005. [cited 2021 Mar 06]. Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=591.

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

Council of Science Editors:

Fernandes JE. Catalisadores Cu-, Co- ou Fe-ZSM-5 caracterização e avaliação na redução de NO a N2 com hidrocarbonetos na presença ou ausência de vapor de água. [Thesis]. Universidade Federal de São Carlos; 2005. Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=591

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

Universidade Nova

3. Carmo, Ana Marta Pereira do. Produção de biocombustíveis a partir da biomassa : melhoria da resistência do zeólito ZSM-5 aos compostos fenólicos.

Degree: 2013, Universidade Nova

URL: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/9712

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Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica

A produção de biocombustíveis provenientes da biomassa lignocelulósica poderá ser efectuada através do… (more)

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Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica

A produção de biocombustíveis provenientes da biomassa lignocelulósica poderá ser efectuada através do processamento conjunto de cargas convencionais do processo de Cracking Catalítico (FCC) e bio-óleos hidrotratados. Contudo, estes bio-óleos contêm compostos fenólicos, os quais reduzem o efeito de um dos aditivos mais utilizados no catalisador de FCC, o zeólito ZSM-5. Assim, numa tentativa de atenuar o impacto das moléculas fenólicas, procedeu-se à dessilicação do zeólito ZSM-5. Este trabalho consistiu no estudo da influência destes compostos sobre a actividade de zeólitos ZSM-5 com diferentes graus de dessilicação, tendo-se variado a temperatura, o tempo de tratamento e a concentração de solução básica. Verificou-se que a dessilicação conduziu a um aumento da mesoporosidade e da área de superfície externa, sem ocorrerem alterações significativas da microporosidade e cristalinidade, o que levou ao aumento da conversão do n-heptano e do metilciclohexano, devido a uma melhoria nas propriedades de difusão. Os ensaios catalíticos realizados na presença de fenol revelaram que o impacto desta molécula oxigenada está dependente do grau de dessilicação e do tipo de hidrocarboneto presente na alimentação, principalmente no início da reacção. Observou-se que é possível atenuar o efeito desactivante do fenol em cerca de 90% através da dessilicação, recorrendo a um grau de dessilicação não muito acentuado para o n-heptano e a um tratamento alcalino mais severo para o metilciclohexano. Contudo, esta redução do impacto do fenol à custa do aumento da mesoporosidade não implica uma redução da selectividade de forma do ZSM-5. Conclui-se que poderá ser vantajoso utilizar, no processo de FCC, zeólitos ZSM-5 dessilicados como aditivos, aquando da incorporação de bio-óleos, visto que estes levam a uma redução do impacto dos compostos fenólicos, sem haver alteração da selectividade de forma.

Advisors/Committee Members: Graça, Inês, Lopes, José, Fonseca, Isabel.

Subjects/Keywords: Cracking catalítico; Bio-óleos; Co-processamento; Compostos fenólicos; zeólito ZSM-5; Dessilicação

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

APA (6^th Edition):

Carmo, A. M. P. d. (2013). Produção de biocombustíveis a partir da biomassa : melhoria da resistência do zeólito ZSM-5 aos compostos fenólicos. (Thesis). Universidade Nova. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/9712

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):

Carmo, Ana Marta Pereira do. “Produção de biocombustíveis a partir da biomassa : melhoria da resistência do zeólito ZSM-5 aos compostos fenólicos.” 2013. Thesis, Universidade Nova. Accessed March 06, 2021. http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/9712.

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

MLA Handbook (7^th Edition):

Carmo, Ana Marta Pereira do. “Produção de biocombustíveis a partir da biomassa : melhoria da resistência do zeólito ZSM-5 aos compostos fenólicos.” 2013. Web. 06 Mar 2021.

Vancouver:

Carmo AMPd. Produção de biocombustíveis a partir da biomassa : melhoria da resistência do zeólito ZSM-5 aos compostos fenólicos. [Internet] [Thesis]. Universidade Nova; 2013. [cited 2021 Mar 06]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/9712.

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

Council of Science Editors:

Carmo AMPd. Produção de biocombustíveis a partir da biomassa : melhoria da resistência do zeólito ZSM-5 aos compostos fenólicos. [Thesis]. Universidade Nova; 2013. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/9712

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

Oklahoma State University

4. Chakraborty, Sourabh. Co-pyrolysis of microalgae, sludge and lignocellulosic biomass for aromatic hydrocarbon production.

Degree: Biosystems and Agricultural Engineering, 2019, Oklahoma State University

URL: http://hdl.handle.net/11244/324811

► ASPEN PLUS simulation of the AB, DS and CW co-pyrolysis system confirmed the findings obtained with the DSC experiments indicating that co-pyrolysis can reduce energy… (more)

Subjects/Keywords: activation energy; aromatic hydrocarbons; change in enthalpy; co-pyrolysis; heat duty; zsm - 5

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

APA (6^th Edition):

Chakraborty, S. (2019). Co-pyrolysis of microalgae, sludge and lignocellulosic biomass for aromatic hydrocarbon production. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/324811

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):

Chakraborty, Sourabh. “Co-pyrolysis of microalgae, sludge and lignocellulosic biomass for aromatic hydrocarbon production.” 2019. Thesis, Oklahoma State University. Accessed March 06, 2021. http://hdl.handle.net/11244/324811.

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

MLA Handbook (7^th Edition):

Chakraborty, Sourabh. “Co-pyrolysis of microalgae, sludge and lignocellulosic biomass for aromatic hydrocarbon production.” 2019. Web. 06 Mar 2021.

Vancouver:

Chakraborty S. Co-pyrolysis of microalgae, sludge and lignocellulosic biomass for aromatic hydrocarbon production. [Internet] [Thesis]. Oklahoma State University; 2019. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/11244/324811.

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

Council of Science Editors:

Chakraborty S. Co-pyrolysis of microalgae, sludge and lignocellulosic biomass for aromatic hydrocarbon production. [Thesis]. Oklahoma State University; 2019. Available from: http://hdl.handle.net/11244/324811

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

5. Paysepar, Hooman. Production of monomeric aromatics/phenolics from hydrolysis lignin (HL) by catalytic fast pyrolysis and hydrothermal liquefaction.

Degree: 2018, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/5381

► Bio-oil, produced from bio-feedstocks by thermochemical conversion technologies (e.g., pyrolysis or direct liquefaction), can be renewable replacement for petroleum for energy and chemical production. However,… (more)

Subjects/Keywords: Bio-oil; heavy oil (HO); hydrolysis lignin (HL); Xilinguole lignite (XL); fast pyrolysis (FP); catalytic fast pyrolysis (CFP); hydrothermal liquefaction (HTL); co-liquefaction; zeolite-X; zeolite-Y; H-ZSM-5; ZSM-5; hematite; iron ore; resin; phenol formaldehyde (PF) resole; bio oil phenol formaldehyde (BPF) resole; phenol extract (PE).; Catalysis and Reaction Engineering

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

APA (6^th Edition):

Paysepar, H. (2018). Production of monomeric aromatics/phenolics from hydrolysis lignin (HL) by catalytic fast pyrolysis and hydrothermal liquefaction. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/5381

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):

Paysepar, Hooman. “Production of monomeric aromatics/phenolics from hydrolysis lignin (HL) by catalytic fast pyrolysis and hydrothermal liquefaction.” 2018. Thesis, University of Western Ontario. Accessed March 06, 2021. https://ir.lib.uwo.ca/etd/5381.

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

MLA Handbook (7^th Edition):

Paysepar, Hooman. “Production of monomeric aromatics/phenolics from hydrolysis lignin (HL) by catalytic fast pyrolysis and hydrothermal liquefaction.” 2018. Web. 06 Mar 2021.

Vancouver:

Paysepar H. Production of monomeric aromatics/phenolics from hydrolysis lignin (HL) by catalytic fast pyrolysis and hydrothermal liquefaction. [Internet] [Thesis]. University of Western Ontario; 2018. [cited 2021 Mar 06]. Available from: https://ir.lib.uwo.ca/etd/5381.

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

Council of Science Editors:

Paysepar H. Production of monomeric aromatics/phenolics from hydrolysis lignin (HL) by catalytic fast pyrolysis and hydrothermal liquefaction. [Thesis]. University of Western Ontario; 2018. Available from: https://ir.lib.uwo.ca/etd/5381

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

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