Catalytic Activity of Ni Based Materials Prepared by Different Methods for Hydrogen Production via the Water Gas Shift Reaction
نویسندگان
چکیده
Water gas shift reactions (WGS) were evaluated over Ni/CeO2 and Ni/CeSmO catalysts for hydrogen production. The effects of catalyst preparation method Sm loading investigated. Ni/ceria synthesized by combustion, sol gel gel-combustion method. After WGS tests, the determined carbon deposition thermogravimetric analysis. analysis temperature programmed NH3 desorption showed that addition promoter made higher weak acid sites lower amount than unpromoted due to it being easily removed. CO chemisorption result indicated Ni/Ce5%SmO prepared combustion has highest Ni metal dispersion metallic surface area compared other catalysts. enhancement activity this is more active exposed reactants. Furthermore, H2-temperature reduction confirmed an easiest catalyst. This behavior accelerates redox process at ceria enhances oxygen vacancy concentration. catalytic measurements exhibited optimum was 5% wt. best high small crystallite size 5%Ni/Ce5%SmO (combustion) resulted in sufficient dispersion, which closely related
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ژورنال
عنوان ژورنال: Catalysts
سال: 2023
ISSN: ['2073-4344']
DOI: https://doi.org/10.3390/catal13010176