Hydrogen Production from CO2 Reforming of Methane Over Cobalt-based Catalysts PDF Download
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Author: Ji Siang Tan
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 108
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Book Description
Increased concerns on anthropogenic greenhouse gas emissions have renewed interest in the CO2 (dry) reforming process as an alternative to steam reforming for synthesis gas production from natural gas. For hydrocarbon dry reforming, where the product stream H2:CO ratio is less than 3, synfuel production is more amenable and acceptable for downstream methanol and other oxygenated synthesis. However, dry reforming is highly endothermic, and suffers from carbon-induced catalyst deactivation. This thesis therefore investigates and evaluates the performance of methane dry reforming process at different operation conditions such as reaction temperature and feed composition, and the effects of loaded metals (Mo and Ni) on alumina-supported Co-based catalyst. Runs of the methane dry reforming experiment were conducted in a computer-controlled fixebed reactor at different feed compositions and reaction temperature. Both MoO3 and NiO phases were formed during wetness co-impregnation with a mixture of deionized water and alumina support as measured in X-ray diffraction. Temperature-programmed calcination showed that the transformations from MoO3 to CoMoO4 phase and NiO to NiAl2O4 phase were a 2 step process involving the formation of an oxidation intermediate form. Calcination of co-impregnated catalysts at 500 0C for 5 h appeared to be optimal preparation condition for H2 selectivity. Al2O3 support was the best support to give the highest H2 to CO ratio. Second metal promotion did not alter reaction rate significantly. However the interaction of loaded metal oxides with the surface carbonaceous species resulted in substantially reduced carbon deposition on Co-based catalyst, with Ni providing the greatest coking resistance compared to Mo. A quantitative relationship between activation energy and feed composition of CO2:CH4 ( 1:1, 2:1 and 3:1 ) as well as reaction temperatures (923 K, 953 K and 973 K) was obtained over bimetallic 5%Ni-10%Co/Al2O3 catalyst which gave the highest value of H2/CO ratio in the methane dry reforming process. Methane dry reforming activity was stable with time-on-stream for 4 h.
Author: Ji Siang Tan
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 108
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Book Description
Increased concerns on anthropogenic greenhouse gas emissions have renewed interest in the CO2 (dry) reforming process as an alternative to steam reforming for synthesis gas production from natural gas. For hydrocarbon dry reforming, where the product stream H2:CO ratio is less than 3, synfuel production is more amenable and acceptable for downstream methanol and other oxygenated synthesis. However, dry reforming is highly endothermic, and suffers from carbon-induced catalyst deactivation. This thesis therefore investigates and evaluates the performance of methane dry reforming process at different operation conditions such as reaction temperature and feed composition, and the effects of loaded metals (Mo and Ni) on alumina-supported Co-based catalyst. Runs of the methane dry reforming experiment were conducted in a computer-controlled fixebed reactor at different feed compositions and reaction temperature. Both MoO3 and NiO phases were formed during wetness co-impregnation with a mixture of deionized water and alumina support as measured in X-ray diffraction. Temperature-programmed calcination showed that the transformations from MoO3 to CoMoO4 phase and NiO to NiAl2O4 phase were a 2 step process involving the formation of an oxidation intermediate form. Calcination of co-impregnated catalysts at 500 0C for 5 h appeared to be optimal preparation condition for H2 selectivity. Al2O3 support was the best support to give the highest H2 to CO ratio. Second metal promotion did not alter reaction rate significantly. However the interaction of loaded metal oxides with the surface carbonaceous species resulted in substantially reduced carbon deposition on Co-based catalyst, with Ni providing the greatest coking resistance compared to Mo. A quantitative relationship between activation energy and feed composition of CO2:CH4 ( 1:1, 2:1 and 3:1 ) as well as reaction temperatures (923 K, 953 K and 973 K) was obtained over bimetallic 5%Ni-10%Co/Al2O3 catalyst which gave the highest value of H2/CO ratio in the methane dry reforming process. Methane dry reforming activity was stable with time-on-stream for 4 h.
Author: Waralee Marungrueang
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 160
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Book Description
The cobalt catalysts (cobalt content by weight: 7%, 10% and 15%) and cobalt-nickel bimetallic catalysts (cobalt-nickel content by weight: 3.5%-3.5%, 5%-5%, 7%-7%, 10%-10% and 15%-15%) were studied in dry reforming of methane for hydrogen and synthesis gas production. All catalysts were synthesized by the wetness impregnation method. The dry reforming of methane was carried out at 700oC, atmosphere pressure using a mixture; CH4 and CO2 in ratio 1:1. It was found that, after 120 minutes, the catalysts that gave the best methane conversion are 10%Co/Al2O3 (61.86%) for mono-metallic catalysts and 10%Ni-10%Co/Al2O3 (96.86%) for bimetallic catalysts. Moreover, the effect of adding potassium promoter to 10%Ni-10%Co/Al2O3 catalyst was studied. The methane conversion of potassium promoted 10%Ni-10%Co/Al2O3 catalyst was slightly lower than one without potassium. However, the adding of promoter could significantly decrease the carbon content on the catalysts.
Author: Annemie Bogaerts
Publisher: MDPI
ISBN: 3038977500
Category : Technology & Engineering
Languages : en
Pages : 248
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages :
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Book Description
Author: Athiya Kaengsilalai
Publisher:
ISBN: 9789749651827
Category :
Languages : en
Pages : 102
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Book Description
Author: Iyad Karamé
Publisher: BoD – Books on Demand
ISBN: 178923574X
Category : Science
Languages : en
Pages : 268
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Book Description
Fossil fuels still need to meet the growing demand of global economic development, yet they are often considered as one of the main sources of the CO2 release in the atmosphere. CO2, which is the primary greenhouse gas (GHG), is periodically exchanged among the land surface, ocean, and atmosphere where various creatures absorb and produce it daily. However, the balanced processes of producing and consuming the CO2 by nature are unfortunately faced by the anthropogenic release of CO2. Decreasing the emissions of these greenhouse gases is becoming more urgent. Therefore, carbon sequestration and storage (CSS) of CO2, its utilization in oil recovery, as well as its conversion into fuels and chemicals emerge as active options and potential strategies to mitigate CO2 emissions and climate change, energy crises, and challenges in the storage of energy.
Author: James J Spivey
Publisher: Royal Society of Chemistry
ISBN: 1847555225
Category : Technology & Engineering
Languages : en
Pages : 265
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Book Description
There is an increasing need to find cost-effective and environmentally sound methods of converting natural resources into fuels, chemicals and energy; catalysts are pivotal to such processes. Catalysis highlights major developments in this area. Coverage of this Specialist Periodical Report includes all major areas of heterogeneous and homogeneous catalysis. In each volume, specific areas of current interest are reviewed. Examples of topics include experimental methods, acid/base catalysis, materials synthesis, environmental catalysis, and syngas conversion. Catalysis will be of interest to anyone working in academia and industry that needs an up-to-date critical analysis and summary of catalysis research and applications. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading experts in their specialist fields, this series is designed to help the chemistry community keep current with the latest developments in their field. Each volume in the series is published either annually or biennially and is a superb reference point for researchers.
Author: Shih-yi Lin
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 143
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Book Description
Author: Moises R. Cesario
Publisher: Bentham Science Publishers
ISBN: 1681087588
Category : Technology & Engineering
Languages : en
Pages : 278
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Book Description
The implementation of hydrogen production processes on an industrial scale requires a comprehensive understanding of the chemical proprieties of catalytic materials and the applications such materials in electrocatalysis. This volume presents information about catalytic materials for hydrogen production and hydrogen valorization in electro-oxidation reactions. Chapters emphasize on materials for classical steam, CO2 sorption enhanced steam reforming and dry reforming for hydrogen production. The hydrogen electro-oxidation reaction in anodes of Solid Oxide Fuel Cells (SOFCs) is also explained. Chapters have been contributed by experts in industrial chemistry, adding a valuable perspective for readers. This volume is essential to chemical engineering researchers and industrial professionals interested in hydrogen production systems and the science behind the materials driving the reactions in key processes.
Author: JianHua Yan
Publisher: Springer
ISBN: 9811036594
Category : Technology & Engineering
Languages : en
Pages : 107
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Book Description
This book provides an overview of hydrogen production from renewable resources such as ethanol using plasma or plasma-catalytic technologies. Further, it presents a balanced and comprehensive treatment of the core principles, novel plasma reactors and diagnostics, as well as state-of-the-art plasma energy applications. It brings together technological advances and research on plasma generators and their application in hydrogen production, including plasma-assisted alcohol reforming technology, plasma-catalytic alcohol reforming technology, the alcohol reforming mechanism, models of alcohol reforming for hydrogen production, the energy balance of hydrogen production from ethanol, and a comparison of alcohol reforming assisted by different plasma treatment systems. As such, it offers a valuable reference guide for scientists, engineers and graduate students in the fields of energy and environment, plasma physics and chemistry.
