CO2 Reforming of Methane on Al2O3-supported Ni,Co Catalysts Prepared by Sol-gel Method PDF Download
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Author: Supawat Pachop
Publisher:
ISBN:
Category : Catalytic reforming
Languages : en
Pages : 122
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Book Description
Syngas is a main product from dry reforming of methane (DRM) which is efficient reaction to convert two main greenhouse gases (CH4 and CO2) into hydrogen and carbon monoxide with H2/CO ratio equal to 1. This study investigated the bimetallic NiCo on alumina-supported catalysts prepared by sol-gel method with different metal loading (7.5%Ni7.5%Co/Al2O3 or 1Ni1Co/Al2O3, 10%Ni5%Co/Al2O3 or 2Ni1Co/Al2O3, 11.25%Ni3.75%Co/Al2O3 or 3Ni1Co/Al2O3) and compared the optimal bimetallic catalyst with monometallic Ni/Al2O3 (15wt.%) and Co/Al2O3 (15wt.%). The synthesized catalysts were characterized by X-ray diffraction (XRD), N2-physisorption, Scanning Electron Microscopy (SEM), NH3 Temperature Programmed Desorption (NH3-TPD), temperature programmed reduction (H2-TPR), Thermo gravimetric analyze (TGA), and CO-chemisorption. The catalysts were used on DRM with composition of 50:50 (vol%) feed CH4:CO2 under atmospheric pressure at 700 °C. The bimetallic catalyst 3Ni1Co/Al2O3 exhibited the highest activities with H2 selectivity of 41%, CH4 conversion of 74%, CO conversion of 79%, high metal dispersion and high specific surface area. Moreover, the 3Ni1Co had high acceptable amount of carbon deposition and can be properly used for long term.
Author: Supawat Pachop
Publisher:
ISBN:
Category : Catalytic reforming
Languages : en
Pages : 122
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Book Description
Syngas is a main product from dry reforming of methane (DRM) which is efficient reaction to convert two main greenhouse gases (CH4 and CO2) into hydrogen and carbon monoxide with H2/CO ratio equal to 1. This study investigated the bimetallic NiCo on alumina-supported catalysts prepared by sol-gel method with different metal loading (7.5%Ni7.5%Co/Al2O3 or 1Ni1Co/Al2O3, 10%Ni5%Co/Al2O3 or 2Ni1Co/Al2O3, 11.25%Ni3.75%Co/Al2O3 or 3Ni1Co/Al2O3) and compared the optimal bimetallic catalyst with monometallic Ni/Al2O3 (15wt.%) and Co/Al2O3 (15wt.%). The synthesized catalysts were characterized by X-ray diffraction (XRD), N2-physisorption, Scanning Electron Microscopy (SEM), NH3 Temperature Programmed Desorption (NH3-TPD), temperature programmed reduction (H2-TPR), Thermo gravimetric analyze (TGA), and CO-chemisorption. The catalysts were used on DRM with composition of 50:50 (vol%) feed CH4:CO2 under atmospheric pressure at 700 °C. The bimetallic catalyst 3Ni1Co/Al2O3 exhibited the highest activities with H2 selectivity of 41%, CH4 conversion of 74%, CO conversion of 79%, high metal dispersion and high specific surface area. Moreover, the 3Ni1Co had high acceptable amount of carbon deposition and can be properly used for long term.
Author: Pornthicha Katong
Publisher:
ISBN:
Category : Catalyst supports
Languages : en
Pages : 316
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Book Description
In the present research, the effect of monometallic (10%wt.Ni, 10%wt.Co) and bimetallic (5%wt.NiCo) on different supports are H-Beta-Al2O3, Al2O3-SiO2 prepared by sol-gel method, and Gamma-alumina commercial catalysts. In addition, to study the effect of bimetallic catalysts with different loading ratio of nickel metal and cobalt metal on H-Beta-Al2O3 supports. Loading ratios of nickel and cobalt indicates as followed 1:3, 1:1, and 3:1. The catalytic activity tests for carbon dioxide reforming of methane at 700 ̊C and atmospheric pressure. It was found that the optimize bimetallic (5%wt.Ni5%wt.Co) which contained Ni:Co in a ratio of 1:1 supported on H-Beta-Al2O3 catalyst prepared by Sol-gel exhibit highest methane and carbon dioxide conversion in carbon dioxide reforming of methane reaction. The superior catalytic performance can be explain by the optimize amount of nickel and cobalt active sites and the smaller with NiO and CoO particles due to higher dispersion implied an easier reducibility and a shift the reduction temperature toward lower temperature. In Addition, the optimize cobalt addition which contained Ni:Co in a ratio of 1:1 has improving nickel metal dispersion of catalysts due to reduce the agglomerate of nickel particles. These features mirror a substantially higher resistance to carbon deposition of cobalt-containing catalysts.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Sol-gel (solution-gelation) method was used to prepare Ni-Ti and Ni-Ti-Al catalysts for reforming of methane with carbon dioxide. This method, after optimizing the parameters such as hydrolysis and acid/alkoxide ratio, is able to make a Ni-Ti catalyst with a surface area as high as 426m2/g when calcined at 473K; but calcination at higher temperature lead to dramatic decrease in surface area. XRD, XPS, TEM and SEM were used to understand this change. Using a packed bed reactor, the catalysts were evaluated with the reforming reaction. It was found that the activity of the Ni-Ti catalyst increases with the Ni loading in the range of 1-10wt%. The reduction temperature has strong effect on activity of the reduced catalyst. Up to 973K, the activity increases with the reduction temperature; but after 973K, the activity decreases and become 0 when the temperature is over 1023K. The Ni-Ti catalyst also deactivated as 15% after 4h of time on stream. The XRD analysis shows that Ti3O5 formed in the catalyst after higher-temperature reduction as well as after the reaction for a period of time. The formation of Ti3O5 may render the catalyst to loss its activity. However, further study is expected to understand the mechanism. TG/DTA analysis shows that both Ni-Ti and Ni-Ti-Al catalysts had carbon deposition; but the latter maintained higher activity in a longer period of time.
Author: Mohammad Reza Rahimpour
Publisher: Elsevier
ISBN: 0443192367
Category : Technology & Engineering
Languages : en
Pages : 557
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Book Description
Advances and Technology Development in Greenhouse Gases: Emission, Capture and Conversion is a comprehensive seven-volume set of books that discusses the composition and properties of greenhouse gases, and introduces different sources of greenhouse gases emission and the relation between greenhouse gases and global warming. The comprehensive and detailed presentation of common technologies as well as novel research related to all aspects of greenhouse gases makes this work an indispensable encyclopedic resource for researchers in academia and industry.Volume 5 titled Carbon Dioxide Conversion to Chemicals and Energy provides a beneficial strategy to control the rise of greenhouse gases (GHGs) in the atmosphere and their conversion into valuable materials such as chemical and energy carriers. The book touches concepts about the conversion of carbon dioxide, which is the main GHG. This two-section volume provides applications of carbon dioxide and the chemical processes employed to fabricate a host of materials. Each section reviews a process in detail and surveys the economic assessments, cost analysis, environmental impacts and challenges, recent advances and new concepts, and the largest operating plants and pilots for carbon conversion. - Introduces different applications of carbon dioxide - Includes environmental challenges and economic assessment of carbon capture and utilization - Describes various chemicals produced from CO2
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Sol-gel (solution-gelation) method was used to prepare Ni-Ti and Ni-Ti-Al catalysts for reforming of methane with carbon dioxide. This method, after optimizing the parameters such as hydrolysis and acid/alkoxide ratio, is able to make a Ni-Ti catalyst with a surface area as high as 426m2/g when calcined at 473K; but calcination at higher temperature lead to dramatic decrease in surface area. XRD, XPS, TEM and SEM were used to understand this change. Using a packed bed reactor, the catalysts were evaluated with the reforming reaction. It was found that the activity of the Ni-Ti catalyst increases with the Ni loading in the range of 1-10wt%. The reduction temperature has strong effect on activity of the reduced catalyst. Up to 973K, the activity increases with the reduction temperature; but after 973K, the activity decreases and become 0 when the temperature is over 1023K. The Ni-Ti catalyst also deactivated as 15% after 4h of time on stream. The XRD analysis shows that Ti3O5 formed in the catalyst after higher-temperature reduction as well as after the reaction for a period of time. The formation of Ti3O5 may render the catalyst to loss its activity. However, further study is expected to understand the mechanism. TG/DTA analysis shows that both Ni-Ti and Ni-Ti-Al catalysts had carbon deposition; but the latter maintained higher activity in a longer period of time.
Author: Eswaramoorthy Muthuswamy
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :
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Author: Moises Romolos Cesario
Publisher: Elsevier
ISBN: 0323856322
Category : Technology & Engineering
Languages : en
Pages : 554
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Book Description
Heterogeneous Catalysis: Materials and Applications focuses on heterogeneous catalysis applied to the elimination of atmospheric pollutants as an alternative solution for producing clean energy and the valorization of chemical products. The book helps users understand the properties of catalytic materials and catalysis phenomena governing electrocatalytic/catalytic reactions, and – more specifically – the study of surface and interface chemistry. By clustering knowledge in these fields, the book makes information available to both the academic and industrial communities. Further, it shows how heterogeneous catalysis applications can be used to solve environmental problems and convert energy through electrocatalytic reactions and chemical valorization. Sections cover nanomaterials for heterogeneous catalysis, heterogeneous catalysis mechanisms, SOX adsorption, greenhouse gases conversion, reforming reactions for hydrogen production, valorization of hydrogen energy, energy conversion and biomass valorization. - Addresses topics of increasing interest to society such as the valorization of biomass, the use of polluting gases to produce value-added products, and the optimization of catalytic materials for water splitting, fuel cells, and other devices - Discusses pollutant adsorption by industrial fume desulphurization processes - Helps improve processes for obtaining chemicals using nonconventional technologies
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: Inamuddin
Publisher: Springer Nature
ISBN: 3030728773
Category : Science
Languages : en
Pages : 354
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Book Description
This edited book provides an in-depth overview of carbon dioxide (CO2) transformations to sustainable power technologies. It also discusses the wide scope of issues in engineering avenues, key designs, device fabrication, characterizations, various types of conversions and related topics. It includes studies focusing on the applications in catalysis, energy conversion and conversion technologies, etc. This is a unique reference guide, and one of the detailed works is on this technology. The book is the result of commitments by leading researchers from various backgrounds and expertise. The book is well structured and is an essential resource for scientists, undergraduate, postgraduate students, faculty, R&D professionals, energy chemists and industrial experts.
