M/(MgO)_y(CeO_2)_(1-y)(M=Ni、Co、Cu)催化剂的催化甲烷燃烧性能

Catalytic Activity of M/(MgO)_y(CeO_2)_(1-y) (M=Ni, Co, Cu) Catalysts for Methane Combustion

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14.32m·2g-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.

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.