堇青石负载Mn-Zn-O复合金属氧化物的甲苯催化燃烧性能

Catalytic combustion of toluene over novel Mn-Zn-O complex oxides catalysts supported on cordierite

以堇青石蜂窝陶瓷为载体、Mn(NO3)2和Zn(NO3)2为原料,采用过量浸渍法制备负载型Mn-Zn-O复合氧化物催化剂,考察Mn与Zn摩尔比、负载量及焙烧温度对甲苯催化燃烧性能的影响,并采用表面积分析仪(BET)、扫描电镜(SEM)和X线衍射仪(XRD)对催化剂进行表征。结果表明:n(Mn)/n(Zn)为2,负载量为10%,经450℃焙烧的催化剂表现出最佳的甲苯催化燃烧性能,在300℃及体积空速为10 000 h-1条件下,催化燃烧质量浓度为3.8μg/m3的甲苯,催化转化率可达91.4%。

A series of Mn-Zn-O complex oxides catalysts supported on cordierite honeycomb were prepared by an impregnation method with using Mn（NO3）2 and Zn（NO3）2.The effects of the molar ratio on Mn and Zn,loading amount of Mn-Zn oxides,and calcinations temperature for the complete oxidation of toluene were investigated.The catalysts were characterized by specific surface area,scanning electron microscope（SEM）,and X-ray diffraction techniques（XRD）.Results showed that the Mn-Zn-O complex oxides catalysts with Mn and Zn molar ratio of 2,10% loading and calcining at 450 ℃ exhibited high catalytic performance.With the concentration of toluene of 3.8 μg/m3 and the gaseous hourly space velocity of 10 000 h-1,the conversion of toluene was 91.4% at the reaction temperature of 300 ℃.