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分别用柠檬酸-凝胶法及沉淀法制备了复合金属氧化物Ce1-xCuxO2(x=0.1,0.2……0.9)催化剂,用等体积浸渍法制备了负载型1.5%Ce1-xCuxO2-x/γ-Al2O3(x=0,0.1,0.2……0.9,1.0)催化剂,并考察了这三类催化剂的二甲醚催化燃烧性能。结果表明,三类催化剂均能一定程度地降低二甲醚的起燃温度(T10)和完全燃烧温度(T90)。负载型催化剂1.5%Ce1-xCuxO2-x/γ-Al2O3(x=0.9)的性能最佳,其起燃温度T10=198℃,完全燃烧温度T90=231℃,连续反应222h,催化剂活性无变化。采用XRD、TPR对催化剂进行表征,发现在1.5%Ce0.1Cu0.9O1.1/γ-Al2O3催化剂上,CeO2和CuO形成了固溶体且高度分散在γ-Al2O3表面,并与γ-Al2O3产生了一定的相互作用,这可能是该催化剂活性高和稳定性好的主要原因。
Ce1-xCuxO2 (x = 0.1, 0.2, 0.9) catalysts were prepared by citric acid-gel method and precipitation method. The supported 1.5% Ce1-xCuxO2-x / γ -Al2O3 (x = 0,0.1,0.2 ...... 0.9,1.0) catalyst, and investigated these three types of catalyst DME catalytic combustion performance. The results show that all three kinds of catalysts can reduce the light-off temperature (T10) and the complete combustion temperature (T90) of dimethyl ether to a certain extent. The catalyst 1.5% Ce1-xCuxO2-x / γ-Al2O3 (x = 0.9) showed the best performance. The ignition temperature T10 = 198 ℃, the complete combustion temperature T90 = 231 ℃, and the continuous reaction for 222h. The catalysts were characterized by XRD and TPR. It was found that CeO2 and CuO formed solid solution on 1.5% Ce0.1Cu0.9O1.1 / γ-Al2O3 catalyst and were highly dispersed on the γ-Al2O3 surface and produced a certain amount of γ-Al2O3 This may be the main reason for high activity and good stability of the catalyst.