Role of oxide support in Ni based catalysts for CO2 methanation
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The CO2 methanation reaction of reduced and unreduced Ni based CeO2, Al2O3, TiO2 and Y2O3 supported catalysts was investigated. The Ni/CeO2 and Ni/Y2O3 catalysts exhibited similar CO2 conversions at all reaction temperatures. The catalysts were studied by X-ray diffraction (XRD), H2 chemisorption, H2 temperature-programmed reduction (TPR), and in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS); the results suggested that the reducibility of both metal and support at low temperature, strong metal support interaction and small Ni particle size are important factors for low-temperature CO2 methanation. Based on the DRIFT studies, the difference in the CO2 adsorption properties and reaction pathway depending on the reduced and unreduced Ni based supported catalysts was discussed.Keywords:
Methanation
Chemisorption
Temperature-programmed reduction
Methanation
Carbon fibers
Water-gas shift reaction
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Chemisorption
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The reaction behavior and technological conditions for selective methanation of carbon monoxide in the hydrogen-rich gas over the nickel-based catalyst prepared by sol-gel method were studied.The effects of reaction temperature and space velocity on the process were investigated.The optimum technological conditions were determined by orthogonal tests to be temperature of 280℃ and space velocity of 1800 h-1.Carbon monoxide could be reduced to zero,and the selectivity to hydrogenation of carbon monoxide was over 99% under above conditions,which could completely meet the qualitative requirement of hydrogen for proton exchange membrane fuel cell.
Methanation
Space velocity
Water-gas shift reaction
Methanizer
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The CO2 methanation reaction of reduced and unreduced Ni based CeO2, Al2O3, TiO2 and Y2O3 supported catalysts was investigated. The Ni/CeO2 and Ni/Y2O3 catalysts exhibited similar CO2 conversions at all reaction temperatures. The catalysts were studied by X-ray diffraction (XRD), H2 chemisorption, H2 temperature-programmed reduction (TPR), and in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS); the results suggested that the reducibility of both metal and support at low temperature, strong metal support interaction and small Ni particle size are important factors for low-temperature CO2 methanation. Based on the DRIFT studies, the difference in the CO2 adsorption properties and reaction pathway depending on the reduced and unreduced Ni based supported catalysts was discussed.
Methanation
Chemisorption
Temperature-programmed reduction
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Methanation
Compounds of carbon
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Kinetics of CO methanation on a commercial Ni/SiO 2 catalyst was evaluated at atmospheric pressure, between 528 and 550 K and for hydrogen to carbon monoxide molar ratios ranging from 3 : 1 to 200 : 1. The effect of reaction products on the reaction rate was also examined. Below 550 K, only methane was selectively formed. Above this temperature, the formation of carbon dioxide was also observed. The experimental data could be described by two modified Langmuir-Hinshelwood kinetic models, based on hydrogenation of surface CO by molecularly or by dissociatively adsorbed hydrogen in the rate-determining step. Water reversibly lowered catalyst activity and its effect was more pronounced at higher temperature.
Methanation
Reactions on surfaces
Reaction rate
Methanizer
Carbon fibers
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An in-depth understanding of the influence mechanism of the nonprecious metal Fe promoter on CO2 methanation is of great significance to the optimal design of high-efficiency CO2 methanation catalysts. In this research, CeO2 and Al2O3-supported Ni-based catalysts were prepared and evaluated for the CO2 methanation reaction. Interestingly, it was found that the addition of Fe into the CeO2-supported Ni catalyst lowered the CO2 methanation performance, while it greatly enhanced the performance of the Al2O3-supported Ni catalyst. A variety of factors over Fe-modified catalysts were explored, in which surface basicity along with oxygen vacancies could contribute to the adjustment of the CO2 methanation performance.
Methanation
Substitute natural gas
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The catalysis of carbon monoxide hydrogenation by supported cobalt and ruthenium clusters is studied, and an unusually specific cobalt methanation catalyst is described. A variety of ruthenium carbonyl clusters catalyzes carbon monoxide methanation, irrespective of support, and Ru 3 (CO) 12 on γ-alumina is found to be a potentially useful carbon dioxide methanation catalyst.
Methanation
Metal carbonyl
Methanizer
Compounds of carbon
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Methanation
Carbon fibers
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Methane can be produced via CO and CO2 methanation. However, the CO2 methanation is more relevant in the context of Power-to-Gas (PtG) applications. The two methanation reactions are accompanied by further reactions such as the reverse water gas shift reaction and the Boudouard reaction. Looking at the overall stoichiometry the CO2 methanation can be seen as the combination of the CO methanation with the reverse water-gas shift. The Boudouard reaction producing unwanted carbon deposits on methanation catalysts is a big challenge especially for the CO methanation but of minor importance for the CO2 methanation and therefore PtG applications.
Methanation
Power-to-Gas
Water-gas shift reaction
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