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Book Hydrogen Production from Carbon Dioxide Reforming of Methane Using Ni KH Catalysts

Download or read book Hydrogen Production from Carbon Dioxide Reforming of Methane Using Ni KH Catalysts written by Sanicha Tosiri and published by . This book was released on 2006 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Hydrogen Production from Carbon Dioxide Reforming of Methane Over Ni KH Zeolite Catalysts

Download or read book Hydrogen Production from Carbon Dioxide Reforming of Methane Over Ni KH Zeolite Catalysts written by Athiya Kaengsilalai and published by . This book was released on 2006 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Carbon Dioxide Reforming of Methane for Hydrogen Production on Co Catalysts and Ni co Bimetallic Catalysts

Download or read book Carbon Dioxide Reforming of Methane for Hydrogen Production on Co Catalysts and Ni co Bimetallic Catalysts written by Waralee Marungrueang and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Hydrogen Production from CO2 Reforming of Methane Over Cobalt based Catalysts

Download or read book Hydrogen Production from CO2 Reforming of Methane Over Cobalt based Catalysts written by Ji Siang Tan and published by . This book was released on 2015 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Development of Inexpensive Catalysts for Hydrogen Production Through the Integration of Stem Reforming of Methane and High Temperature Water Gas Shift

Download or read book Development of Inexpensive Catalysts for Hydrogen Production Through the Integration of Stem Reforming of Methane and High Temperature Water Gas Shift written by Trevor L. LeValley and published by . This book was released on 2015 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is great concern about the increasing demand for energy with respect to carbon emissions, but hydrogen (H2), a clean fuel, could help alleviate this concern. The replacement of fossil fuels with H2 is cost prohibitive, but the integration of steam reforming of methane (SRM) and water gas shift (WGS) could greatly decrease the cost of production. A composite catalyst of nickel, cerium, zirconium, and zinc was designed to provide activity in both the SRM and WGS reactions. The catalysts were characterized by a variety of techniques including BET, TEM, SEM, TPO, and XRD. It was found that the addition of zinc decreased the surface area, and therefore the activity of the SRM reaction, although it increased WGS activity as observed by improved carbon dioxide selectivity and H 2 production. Zinc also increased resistance to carbon deposition. Additionally, aging of precipitates during catalyst synthesis provided improved stability over 48 hours. A Ce/Zr/Zn catalyst doped with 10% Ni and aged for two hours was found to have a final conversion of nearly 20% at 650 °C, and high CO2 selectivity around 55%. This catalyst is an important step in the emerging field of low temperature SRM, a field that could lead to a reduction in carbon emissions.

Book Heterogeneous Catalysts for Hydrogen Production from Methane and Carbon Dioxide

Download or read book Heterogeneous Catalysts for Hydrogen Production from Methane and Carbon Dioxide written by Julia M. Pusel and published by . This book was released on 2015 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Several heterogeneous catalysts were studied for synthesis gas production through dry reforming of methane (DRM). This process uses carbon dioxide in lieu of the steam that is traditionally used in conventional methane reforming to produce hydrogen that can then be repurposed in more chemical processes [2]. The monometallic catalysts explored were Ni/Al 2 O3 and Ni/CeZrO2 followed by their bimetallic versions PtNi/Al 2 O3 and PtNi/CeZrO2 at 800°C. In addition to these catalysts, platinum supported Zeolitic Imidazolate Framework (ZIF)-8 was also investigated in comparison with PtNi/CeZrO2 at 490°C. The studies suggest that these catalysts are suitable for promoting the dry reforming of methane for hydrogen production.

Book The Development of Ni Based Catalysts for Carbon Dioxide Reforming of Methane

Download or read book The Development of Ni Based Catalysts for Carbon Dioxide Reforming of Methane written by Pengfei Cao and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Plasma Catalysis

Download or read book Plasma Catalysis written by Annemie Bogaerts and published by MDPI. This book was released on 2019-04-02 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Fuel Cells Technologies for Fuel Processing

Download or read book Fuel Cells Technologies for Fuel Processing written by Dushyant Shekhawat and published by Elsevier. This book was released on 2011-03-18 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fuel Cells: Technologies for Fuel Processing provides an overview of the most important aspects of fuel reforming to the generally interested reader, researcher, technologist, teacher, student, or engineer. The topics covered include all aspects of fuel reforming: fundamental chemistry, different modes of reforming, catalysts, catalyst deactivation, fuel desulfurization, reaction engineering, novel reforming concepts, thermodynamics, heat and mass transfer issues, system design, and recent research and development. While no attempt is made to describe the fuel cell itself, there is sufficient description of the fuel cell to show how it affects the fuel reformer. By focusing on the fundamentals, this book aims to be a source of information now and in the future. By avoiding time-sensitive information/analysis (e.g., economics) it serves as a single source of information for scientists and engineers in fuel processing technology. The material is presented in such a way that this book will serve as a reference for graduate level courses, fuel cell developers, and fuel cell researchers. Chapters written by experts in each area Extensive bibliography supporting each chapter Detailed index Up-to-date diagrams and full colour illustrations

Book Hydrogen Production from Gasoline Using Nickel Based Catalysts

Download or read book Hydrogen Production from Gasoline Using Nickel Based Catalysts written by Andrew Roland Tadd and published by . This book was released on 2006 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Promotional Effects of Cerium on Catalytic Carbon Dioxide Reforming of Methane Over ZSM 5 Supported Nickel

Download or read book Promotional Effects of Cerium on Catalytic Carbon Dioxide Reforming of Methane Over ZSM 5 Supported Nickel written by Mingchen Tang and published by . This book was released on 2014 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: People are increasingly interested in CO2 reforming of CH 4 since the reaction can convert two cheap and abundant greenhouse gases (CH4 and CO2) to useful syngas (H2 +CO). The major challenge of this highly endothermic reforming reaction is carbon deposition and sintering of catalyst, which results in catalyst deactivation and even the blockage of reactor flow path. Ni-based catalysts are considered to be more industrially favorable for the application of CO2 reforming of CH4 reaction because of its ability in reducing the activation energy of the reaction, high availability and low cost; although it is more sensitive to coke formation than noble metals since it can catalyze carbon formation via methane decomposition and the Boudouard reaction. Ni/ZSM-5 catalysts with Ce modification prepared via incipient wetness impregnation method and characterized with BET, XRD, and SEM techniques were used to overcome the challenge. Factorial tests were conducted to evaluate the effects of Ce on the catalytic reforming reaction. Experimental results show that Ce is an effective promoter for the reaction. It can not only improve the selectivity of H 2 in syngas production but also suppress the carbon formation.