Abstract
Ni-CeO2/SBA-15-V catalyst was prepared by the impregnation method with vacuum thermal treatment and used for CO2 methanation reaction. Compared with Ni-CeO2/SBA-15-air catalyst with thermal treatment in air, the reduced Ni-CeO2/SBA-15-V catalyst with vacuum thermal treatment exhibited higher Ni dispersion and smaller Ni particle size. In CO2 methanation reaction, the Ni-CeO2/SBA-15-V catalyst was more active and selective than the Ni-CeO2/SBA-15-air catalyst. The good activity and selectivity of Ni-CeO2/SBA-15-V catalyst should be due to highly dispersed Ni in contact with small CeO2 particles.
Highlights
With the increasing consumption of fossil fuel, CO2 released into the atmosphere has resulted in climate change and global warming, and the utilization of CO2 has received much attention
Various catalysts have been developed for CO2 methanation at low temperature
Noble metal-based catalysts possess good activity for low-temperature CO2 methanation, Ni-based catalysts are preferred in industrial processes due to the low cost, and they have been applied for CO methanation [11,12] and CO2 methanation [13]
Summary
With the increasing consumption of fossil fuel, CO2 released into the atmosphere has resulted in climate change and global warming, and the utilization of CO2 has received much attention. Noble metal-based catalysts possess good activity for low-temperature CO2 methanation, Ni-based catalysts are preferred in industrial processes due to the low cost, and they have been applied for CO methanation [11,12] and CO2 methanation [13]. It is difficult to obtain highly dispersed Ni particles on SBA-15 support by the conventional impregnation method, and Ni particles are mainly located on the SBA-15 outer surface [19]. Vacuum thermal treatment was applied to synthesize highly dispersed Cu [24], Pt [25], and Pd [26] particles on mesoporous SBA-15. The Ni-CeO2/SBA-15 catalyst was prepared by the impregnation method with vacuum thermal treatment and used for CO2 methanation. The vacuum thermal treated catalyst exhibited high dispersion of Ni and CeO2 and showed high activity and selectivity for CO2 methanation reaction
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