Effect of CeO2 addition on Ni/Al2O3 catalysts for methanation of carbon dioxide with hydrogen

• Published in: Journal of natural gas chemistry 2012-11, Vol.21 (6), p.703-707
• Main Authors: Liu, Hezhi, Zou, Xiujing, Wang, Xueguang, Lu, Xionggang, Ding, Weizhong
• Format: Article
• Language: English
• Subjects: Air pollution caused by fuel industries; alumina; Aluminum oxide; Applied sciences; Carbon dioxide; Catalysis; Catalysts; ceria; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Methanation; Natural gas; Nickel; nickel catalyst; Pollution reduction; Stability tests; Stack gas and industrial effluent processing; 二氧化碳; 催化剂; 催化性能; 氢; 氧化铈; 甲烷化; 稳定性试验
• ISSN: 1003-9953
• DOI: 10.1016/S1003-9953(11)60422-2

The Ni-CeO2/Al2O3 catalysts with a nickel content of 15 wt% prepared via impregnating boehmite were found to be highly active and stable for methanation of carbon dioxide with hydrogen at a H2/CO2 molar ratio of 4. The effects of CeO2 content and reaction temperature on the performance of the Ni-CeO2/Al2O3 catalysts were studied in detail. The results showed that the catalytic performance was strongly dependent on the CeO2 content in Ni-CeO2/Al2O3 catalysts and that the catalysts with 2 wt% CeO2 had the highest catalytic activity among the tested ones at 350 ℃. The XRD and H2-TPR characterizations revealed that the addition of CeO2 decreased the reduction temperature by altering the interaction between Ni and Al2O3, and improved the reducibility of the catalyst. Preliminary stability test of 120 h on stream over the Ni-2CeO2/Al2O3 catalyst at 350 ℃ revealed that the catalyst was much better than the unpromoted one.