以堇青石蜂窝陶瓷为载体,以过渡金属Mn（NO3）2和稀土金属Ce（NO3）26H2O盐为原料,采用柠檬酸浸渍法制备负载型MnCeOx混合氧化物催化剂,考察Mn与Ce的摩尔比、焙烧温度与时间以及柠檬酸用量对催化燃烧苯性能的影响,应用正交实验设计方案优化最佳制备工艺参数,并采用X线衍射仪（XRD）、H2-TPR和扫描电镜（SEM）对催化剂进行表征与分析。实验结果表明：n（Mn）∶n（Ce）=19∶21,焙烧时间为7h,n（Mn＋）∶n（柠檬酸）=6∶1的催化剂表现出最佳的催化活性,在300℃及体积空速为20000h-1条件下,催化燃烧浓度为1500×10-6的苯,催化转化率可达99.1%。
A series of MnCeOx catalysts supported on cordierite honeycomb were prepared by an impregnation method with adding citric acid and using Mn(NO3)2 and Ce(NO3)2·6H2O. The effect of the molar ratio of Mn/Ce, calcinations temperature and time, the amount of citric acid on the catalytic properties for the complete oxidation of benzene were investigated. The orthogonal experiment was designed to get the best of technological parameter. These catalysts were characterized by XRD, H2-TPR and SEM techniques. The results show that the MnCeOx/Cord catalyst with Mn/Ce molar ratio of 19/21, calcining with 7h and Mn+/(citric acid) molar ratio of 6 exhibits high catalytic performance. When the concentration of benzene was 15 × 10 3 and the gaseous hourly space velocity was 20000 h-1, the conversion of toluene was 99. 1% at the reaction temperature of 300℃.
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