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以MgO,Al2O3,SiO2,TiO2和ZrO2为载体,采用浸渍法制备了负载型Cu-Mn-Ce(CMC)三元复合氧化物催化剂,并用TG,XRD,BET和H2-TPR对催化剂进行了表征,以甲苯和丙酮催化燃烧为模型反应,考察了该催化剂的催化活性。结果表明,纯CMC催化剂的铈基固溶体结构表现出优良的催化活性,当CMC负载在SiO2和Al2O3上后,其大比表面积和表面羟基均不利于CMC活性固溶体结构的形成,另外Mn,Cu等过渡金属与MgO载体发生相互作用而破坏了CMC的活性结构。TiO2和ZrO2则较好地保持了CMC活性固溶体的结构,并显著提高了CMC催化剂的高温热稳定性。
Supported Cu-Mn-Ce (CMC) ternary composite oxide catalysts were prepared by impregnation using MgO, Al2O3, SiO2, TiO2 and ZrO2 as supports. The catalysts were characterized by TG, XRD, BET and H2-TPR , Catalytic combustion of toluene and acetone was taken as a model reaction and the catalytic activity of the catalyst was investigated. The results show that the pure cerium-based solid solution of CMC catalyst exhibits excellent catalytic activity. When the CMC is supported on SiO2 and Al2O3, the large specific surface area and surface hydroxyl groups are not conducive to the formation of CMC active solid solution. In addition, Mn, Cu, etc. Transition metal interacts with the MgO support and destroys the CMC’s active structure. TiO2 and ZrO2 retained the structure of CMC active solid solution well and remarkably enhanced the high temperature thermal stability of CMC catalyst.