期刊
CATALYSTS
卷 7, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/catal7040104
关键词
carbon dioxide; methanation; Ce-Zr oxide; nickel catalyst
资金
- Shanghai Municipal Education Commission
- Major State Basic Research Development Program of China [2014CB643403]
- National Science Fund for Distinguished Young Scholars [51225401]
- Basic Major Research Program of Science and Technology Commission Foundation of Shanghai [14JC1491400]
Ni-Ce-Zr mixed oxides were prepared through one-pot hydrolysis of mixed metal nitrates with ammonium carbonate for CO2 methanation. The effects of Ce/Zr molar ratio and Ni content on catalysts' physical and chemical properties, reduction degree of Ni2+, and catalytic properties were systematically investigated. The results showed that Zr could lower metallic Ni particle sizes and alter interaction between Ni and supports, resulting in enhancements in the catalytic activity for CO2 methanation. The Ni-Ce-Zr catalyst containing 40 wt % Ni and Ce/Zr molar ratio of 9:1 exhibited the optimal catalytic properties, with 96.2% CO2 conversion and almost 100% CH4 selectivity at a low temperature of 275 degrees C. During the tested period of 500 h, CO2 conversion and CH4 selectivity over Ni-Ce-Zr catalyst kept constant under 300 degrees C.
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