A Supported Manganese Oxide Catalyst For Carbon Dioxide Methanation Reaction In Natural Gas
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A Supported Manganese Oxide Catalyst For Carbon Dioxide Methanation Reaction In Natural Gas
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Author : Wan Nazwanie Wan Abdullah
language : en
Publisher:
Release Date : 2011
A Supported Manganese Oxide Catalyst For Carbon Dioxide Methanation Reaction In Natural Gas written by Wan Nazwanie Wan Abdullah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Manganese Oxide Doped Noble Metals Supported Catalyst For Carbon Dioxide Methanation Reaction
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Author : Najwa Sulaiman
language : en
Publisher:
Release Date : 2009
Manganese Oxide Doped Noble Metals Supported Catalyst For Carbon Dioxide Methanation Reaction written by Najwa Sulaiman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Catalysis categories.
Catalytic Conversion Of Carbon Monoxide And Methane Over Metal And Metal Oxide Catalysts
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Author : Wenchi Liu
language : en
Publisher:
Release Date : 2018
Catalytic Conversion Of Carbon Monoxide And Methane Over Metal And Metal Oxide Catalysts written by Wenchi Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Catalysis is of vital importance in a wide range of areas including energy processing and chemical production. Catalytic conversion of C1 sources such as carbon monoxide and methane to make hydrocarbon fuels and oxygenated products has far reaching implications especially in the context of the gradual depletion of crude oil resource and the potential surge in the natural gas production in the coming decades. The control over reaction activity and selectivity for the conversion CO and CH4 in the Fischer–Tropsch synthesis and oxidative coupling of methane (OCM) have received tremendous attention and have been proved challenging. This dissertation focuses on the catalytic conversion of CO (Fischer–Tropsch synthesis) using supported cobalt based bimetallic nanoparticle model catalysts and the oxidative coupling of methane with noble metal promoted metal oxide catalysts. Using colloidal synthesis, a series of cobalt based bimetallic nanoparticles Co–M (M = Mn, Ru, Rh, and Re) with well-defined sizes, shapes, and compositions were obtained. Detailed synthesis procedures were presented and key synthetic parameters were discussed. The as-synthesized nanoparticles were subjected to extensive in-situ X-ray spectroscopy studies using ambient pressure X-ray photoelectron spectroscopy (AP-XPS) and X-ray absorption spectroscopy (XAS) under catalytic relevant conditions. Composition wise, the results indicate the surface concentration of Co on the as-synthesized Co–M bimetallic particles is slightly less than the bulk atomic Co %. While oxidation treatment led to a slight increase of the surface Co, major effect was seen after the reduction treatment where surface segregation of the second metal resulted in a drastic decrease of the surface Co content. The effect is more pronounced at elevated reduction temperatures. Under reaction conditions, the surface compositions remained similar to those after the reduction treatment at high temperatures. Among the bimetallics tested, the Co–Mn system is relatively less susceptible to surface reconstructions induced by oxidation and reduction treatments. In addition, the reducibility of Co was also shown to be modified depending on the second metal present and Re was proved to be most efficient in leading to a facile reduction of Co. Catalytic performance of the bimetallic catalysts supported on mesoporous silica MCF–17 indicates a positive effect in the catalytic activity for Co–Rh and Co–Mn systems, while Co–Re and Co–Cu showed decreased activity. Less pronounced promotion effect of the second metal on the product distribution was observed with only a slight increase in the selectivity towards C5+ products. The selectivities for CH4 and C5+ of the various Co–M bimetallic catalysts generally resemble those of pure Co catalysts. Although in extremely low selectivity, alcohols were also formed with Co–Rh and Co–Cu bimetallic catalysts. The appearance of longer chain alcohol such as propanol, which was not present for pure Co catalysts, is an evidence for potential synergistic promotion. For oxidative coupling of methane (OCM), the promotion effect of noble metals (Pt, Ir, and Rh) on the performance of MnxOy-Na2WO4/MCF–17 catalysts was investigated. The introduction of noble metals had little effect on the surface area and phase composition of the original catalyst but led to a more reduced nature of the surface oxide species. Catalytic study revealed an enhanced selectivity towards both C2 and C3 hydrocarbons as compared to the undoped MnxOy-Na2WO4/MCF–17 catalyst in the order of Rh-doped > Ir-doped > Pt-doped samples together with a lower olefin to paraffin ratio. A more optimized strength of interaction between the carbon intermediates and the catalyst surface was suggested, which in combination with the improved reducibility of Mn and W species are believed to be responsible for the improved performance. In addition, monodispersed leaf-like manganese–tungsten–oxide (Mn–W–Ox) nanoparticles and hydroxylated hexagonal boron nitride (h-BN) were synthesized and used as novel catalysts in OCM reaction. Preliminary results indicate that the MCF–17 supported Mn–W–Ox nanoparticle catalyst showed a CH4 conversion of 5.4% and C2 selectivity of 42% with good stability over time. On the other hand, hydroxylated h-BN exhibited good activity (~20% CH4 conversion) with moderate selectivity towards C2 hydrocarbons (20%–30%). However, the hydroxylated h-BN catalysts faced serious deactivation, which was not eliminated by lowering the reaction temperature or the oxygen concentration in the reaction gas feed.
The Activation Of Catalysts
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Author : Willard Alexander Whitesell
language : en
Publisher:
Release Date : 1923
The Activation Of Catalysts written by Willard Alexander Whitesell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1923 with Carbon monoxide categories.
Methanation Catalysts
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Author : G. H. Watson
language : en
Publisher:
Release Date : 1980
Methanation Catalysts written by G. H. Watson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Catalysts categories.
Studies On Supported Rare Earth Metal Catalyst With High Specific Activity And Selectivity Towards Carbon Dioxide Removal In Natural Gas Via Methanation Reaction
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Author : Nor Aziah Buang
language : en
Publisher:
Release Date : 2005
Studies On Supported Rare Earth Metal Catalyst With High Specific Activity And Selectivity Towards Carbon Dioxide Removal In Natural Gas Via Methanation Reaction written by Nor Aziah Buang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Catalysts categories.
Natural Gas
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Author : Primož Potocnik
language : en
Publisher: BoD – Books on Demand
Release Date : 2010-08-18
Natural Gas written by Primož Potocnik and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-08-18 with Technology & Engineering categories.
The contributions in this book present an overview of cutting edge research on natural gas which is a vital component of world's supply of energy. Natural gas is a combustible mixture of hydrocarbon gases, primarily methane but also heavier gaseous hydrocarbons such as ethane, propane and butane. Unlike other fossil fuels, natural gas is clean burning and emits lower levels of potentially harmful by-products into the air. Therefore, it is considered as one of the cleanest, safest, and most useful of all energy sources applied in variety of residential, commercial and industrial fields. The book is organized in 25 chapters that cover various aspects of natural gas research: technology, applications, forecasting, numerical simulations, transport and risk assessment.
Catalysis
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Author : John R. Anderson
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Catalysis written by John R. Anderson and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Catalytic oxidation processes are bf central importance to a substantial part of large-scale chemical industry. Indeed, this area of industrial catalysis has an extremely long history which stretches back well into the last century. The development and growth of catalytic oxi dation processes for the manufacture of commodities such as sulfuric acid and nitric acid can be viewed as indicators for the growth of the early and middle years of the entire inorganic chemical industry, and in an analogous fashion the manufacture of products such as phthalic anhydride, maleic anhydride and ethylene oxide has been central to the development of an organic chemical industry. We should all be able" to learn from history, and present-day scientists and technologists will find considerable benefit in following the account of the historical development of catalytic oxidation processes presented in Chapter I by Drs. G. Chinchen, P. Davies and R. J. Sampson. Alkenes are important intermediates in many processes in organic chemical industry. Being mostly petroleum derived, the alkene availability pattern does not necessar ily match consumption requirements and an alkene inter conversion process such as metathesis is clearly of in dustrial importance. In fact alkene metathesis, in addi tion to its industrial significance, poses an interesting mechanistic problem. upon which considerable effort has been expended in recent years and which is now fairly well understood.
Alumina Supported Manganese Oxide Based Doped Transition Metal Catalysts For Methanation Reaction
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Author : Chien Ju Lee
language : en
Publisher:
Release Date : 2010
Alumina Supported Manganese Oxide Based Doped Transition Metal Catalysts For Methanation Reaction written by Chien Ju Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Natural gas categories.
Plasma Catalysis
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Author : Annemie Bogaerts
language : en
Publisher: MDPI
Release Date : 2019-04-02
Plasma Catalysis written by Annemie Bogaerts and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-04-02 with Technology & Engineering categories.
Plasma catalysis is gaining increasing interest for various gas conversion applications, such as CO2 conversion into value-added chemicals and fuels, N2 fixation for the synthesis of NH3 or NOx, methane conversion into higher hydrocarbons or oxygenates. It is also widely used for air pollution control (e.g., VOC remediation). Plasma catalysis allows thermodynamically difficult reactions to proceed at ambient pressure and temperature, due to activation of the gas molecules by energetic electrons created in the plasma. However, plasma is very reactive but not selective, and thus a catalyst is needed to improve the selectivity. In spite of the growing interest in plasma catalysis, the underlying mechanisms of the (possible) synergy between plasma and catalyst are not yet fully understood. Indeed, plasma catalysis is quite complicated, as the plasma will affect the catalyst and vice versa. Moreover, due to the reactive plasma environment, the most suitable catalysts will probably be different from thermal catalysts. More research is needed to better understand the plasma–catalyst interactions, in order to further improve the applications.