Manganese Oxide Doped Noble Metals Supported Catalyst For Carbon Dioxide Methanation Reaction
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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.
Nickel Oxide Doped Noble Metals Supported Catalysts For Carbon Dioxide Methanation And Desulfurization Reactions
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Author : Susilawati Toemen
language : en
Publisher:
Release Date : 2011
Nickel Oxide Doped Noble Metals Supported Catalysts For Carbon Dioxide Methanation And Desulfurization Reactions written by Susilawati Toemen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Catalysts categories.
Nickel Oxide Catalyst Doped Noble Metals For The Conversion Of Carbon Dioxide To Methane
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Author : Chia Ling Tan
language : en
Publisher:
Release Date : 2010
Nickel Oxide Catalyst Doped Noble Metals For The Conversion Of Carbon Dioxide To Methane written by Chia Ling Tan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Methanation categories.
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.
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.
Heterogeneous Cumn2o4 Pt Pd And Sno2 Catalysts For Ambient Temperature Oxidation Of Carbon Monoxide
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Author : James K. W. Aldridge
language : en
Publisher:
Release Date : 2011
Heterogeneous Cumn2o4 Pt Pd And Sno2 Catalysts For Ambient Temperature Oxidation Of Carbon Monoxide written by James K. W. Aldridge 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.
Ambient temperature oxidation of carbon monoxide is a vital reaction for life support in enclosed atmospheres such as submarines and spacecraft. This reaction is usually achieved through the use of two classes of catalyst. Firstly, mixed copper and manganese oxides designated 'Hopcalite' or CuMn2O4. Secondly, high surface area noble metal catalysts deposited on durable metal oxide supports. Both of these classes of catalyst are investigated in this thesis, with the aim of producing novel, reproducible, robust and active ambient temperature carbon monoxide oxidation catalysts. In this thesis, CuMn2O4 is sequentially doped and/or impregnated with low weightings (1-10%) of the transition metals V and Ce, noble metals Pd and Pt and metalloid Si in an attempt to improve activity and moisture resistance. It was observed that doped V, Ce, Pd and Si are catalytic poisons toward CuMn2O4. This is likely due to their interference in the Cu ↔ Mn redox mechanism. XRD investigations infer doped Pd is a structural promoter toward CuMn2O4, increasing surface area and decreasing catalyst crystalinity. Impregnation of noble metals Pt and Pd onto CuMn2O4 surface causes deactivation of the noble metals, most likely due to the oxidation of Pt and Pd by Mn. No novel catalyst tested in this thesis displayed increased resistance to moisture deactivation. Noble metals Pt and Pd were impregnated upon 3 mm diameter Al2O3 spheres and tested for ambient temperature CO oxidation activity. The positive synergy between the two metals is measured, and the most efficient Pt:Pd ratio is discovered to be ~ 1:4. A novel, atom efficient method, for synthesising Pt/Pd/SnO2/Al2O3 catalysts using tin oxalate was conceived of and investigated. Compared to existing reference catalysts, oxalate derived catalysts preformed favourably and can be described as equivalently active.
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.
Methanation Reaction Over Cobalt Oxide Doped Noble Metal Catalysts For The Purification Of Natural Gas
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Author : Azwati Ab. Aziz
language : en
Publisher:
Release Date : 2009
Methanation Reaction Over Cobalt Oxide Doped Noble Metal Catalysts For The Purification Of Natural Gas written by Azwati Ab. Aziz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 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.
Environmental Catalysis
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Author : F J J G Janssen
language : en
Publisher: World Scientific
Release Date : 1999-04-14
Environmental Catalysis written by F J J G Janssen and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-04-14 with Science categories.
This book brings together highlights of a theme which is growing in interest: the creation of a sustainable society using catalysis as the main tool. Catalysts play key roles in the production of clean fuels, the conversion of waste and green raw materials into energy, clean combustion engines including control of NOx and soot production and reduction of greenhouse gases, production of clean water and of polymers, as well as reduction from polymers to monomers. Catalysts are also of prime importance in the developing H2 and syngas production technology, aimed at producing clean fuels for the coming decades. And catalysts can be recycled.