堇青石负载CuCo整体式催化剂的制备及其催化氧化甲苯性能

Preparation of cordierite-supported CuCo monolithic catalyst and its catalytic performance on toluene

以堇青石蜂窝陶瓷为载体,采用浸渍法制备了CuCo整体式催化剂,通过XRD、SEM、XPS和H2-TPR等手段对催化剂进行了表征,考察了Cu^(2+)与Co^(2+)的质量比(Cu/Co质量比)、活性组分负载量、煅烧温度对其催化氧化甲苯性能的影响。结果表明:部分Cu^(2+)取代Co^(2+)进入Co3O4形成Cu_(0.27)Co_(2.73)o_(4)尖晶石;整体式催化剂的最佳制备条件为Cu/Co质量比2∶1、活性组分负载量15%(w)、煅烧温度500℃;在空速为10000 h^(-1)、甲苯质量浓度为2000 mg/m^(3)的条件下,整体式催化剂催化氧化甲苯转化50%和90%时的温度分别为252℃和289℃。

In this paper,CuCo monolithic catalyst was prepared by impregnation method using cordierite honeycomb ceramics as the carrier.The prepared catalyst was characterized by XRD,SEM,XPS,and H2-TPR.The effects of Cu^(2+)to Co^(2+)mass ratio(Cu/Co mass ratio),load of active constituents,and calcination temperature on the catalytic combustion activity of toluene were investigated.The experimental results show that part of Cu^(2+)replaces Co^(2+)to enter Co3O4 to form Cu_(0.27)Co_(2.73)o_(4)spinel.The best preparation condition of a monolithic catalyst is a Cu/Co mass ratio of 2∶1,a load of 15%(w),and a calcination temperature of 500℃.Under the condition of a space velocity of 10000 h^(−1) and a toluene mass concentration of 2000 mg/m^(3),the temperature required for the 50%and 90%conversion rate of toluene catalyzed and oxidized by the monolithic catalyst is 252℃and 289℃,respectively.