M/(MgO)y(CeO2)1－y(M=Ni、Co、Cu)催化剂的催化甲烷燃烧性能

采用溶胶凝胶法制备了M/(MgO)_y(CeO2)_1－y(M=Ni、Co、Cu)催化剂. 研究了催化剂Ni/(MgO)y(CeO₂)_1－y催化活性与Ce含量的关系, 当y＝0.9时, 催化剂的活性和稳定性最好. 对比研究了(MgO)_0.9(CeO2)_0.1为载体, 负载Ni、Co、Cu活性组分的催化剂催化甲烷燃烧性能. 结果表明, 负载Cu的催化剂活性最好, 但二次评价后催化剂已烧结；负载Ni的催化剂活性与负载Cu的催化剂相差不大, 且稳定性最好, 经1000 ℃焙烧的Ni/(MgO)_0.9(CeO2)_0.1催化剂比表面仍有14.32 m₂•g^－1, 具有较高的催化活性和很好的热稳定性；负载Co的催化剂活性不如前两者, 稳定性居中, 但比表面降低得最少, 抗烧结能力强.

Catalytic Activity of M/(MgO)y(CeO2)1-y (M=Ni, Ce, Cu) Catalysts for Methane Combustion

A sol-gel method was employed to prepare M/(MgO)_y(CeO₂)_1－y (M=Ni, Co, Cu) catalyst for methane combustion. The relationship between the catalytic activity of Ni/(MgO)_y(CeO₂)_1－y and the content of Ce was studied. Ni/(MgO)_0.9(CeO₂)_0.1 was found to have the highest catalytic activity and the best thermal stability. The effect of the activity of M/(MgO)_0.9(CeO₂)_0.1 (M=Ni, Co, Cu) on combustion of methane was investigated. Cu/(MgO)_0.9(CeO₂)_0.1 had the highest activity, but was sintered after second evaluation. The catalytic activity of Ni/(MgO)_0.9(CeO₂)_0.1 catalyst was similar to that of Cu/(MgO)_0.9(CeO₂)_0.1 catalyst and Ni/(MgO)_0.9(CeO₂)_0.1 catalyst had the best thermal stability. Co/(MgO)_0.9(CeO₂)_0.1 catalyst exhibited the lowest activity and a mediate stability, it retained a large specific surface area after second evaluation. Ni/(MgO)_0.9(CeO₂)_0.1 catalyst calcined at 1000 ℃ still had a specific surface area of 14.32 m2•g^－1 and high catalytic activity as well as good thermal stability.