CuCoO_x/TiO_2催化氧化NO性能研究  

Performance of CuCoO_x/TiO_2 for catalytic oxidation of nitric oxide

作　　者：陈霞[1] 张俊丰[1] 童志权[1] 黄妍[1] 黄明[1] 

机构地区：[1]湘潭大学环境工程系,湘潭411105

出　　处：《环境工程学报》2009年第5期869-874,共6页Chinese Journal of Environmental Engineering

基　　金：湖南省自然科学基金资助项目(07JJ4003);湖南省科技厅计划项目(2007GK3063);湖南省教育厅项目(08C890)

摘　　要：采用浸渍法制备了CuCoOx/TiO2催化剂,考察了焙烧温度、反应温度、氧含量、NO浓度和空间速度对催化剂催化氧化NO性能的影响,并考察了催化剂的抗硫抗水性能。XRD、TPR和BET分析表明,350℃焙烧的催化剂具有Cu-Co2O4尖晶石结构,比表面积大,对NO的氧化效果好。在空速为5000 h-1,NO进口浓度500 mg/m3,含氧量10%的条件下,反应温度300℃时NO转化率可达79.5%,250℃时NO转化率接近50%。该催化剂具有良好的单独抗SO2、抗H2O毒化性能,H2O和SO2同时存在时很快失活。该催化剂可用于不同时含H2O和SO2的含NO气体催化氧化后再吸收处理。A series of catalysts of CuCoOx support on TiO2 were prepared for NO selective catalytic oxidaion （SCO） by impregnation. Effects of different CuCo2O4 calcination temperatures and reaction temperatures, O： and NO concentrations, space velocity on NO conversion were also investigated. It was found that the catalyst at the calcination temperature of 350 ℃ shown the highest activity. The results of XRD, TPR analysis and BET testing shown that the catalyst calcined at 350℃ has CuCo2O4spinel, and its surface area is much larger than that calcined at other temperatures. The results shown that this catalyst yielded 79.5% NO conversion at 300℃ , and nearly 50% at 250℃ when the volume fraction of feeding gas is NO 500 mg/m3, O2 10% , space velocity 5 000 h-1 In addition, only SO2 or H2O have little effects on NO oxidization, but in the presence of both SO2 and H2O, the catalyst is poisoned quickly. The CuCo2O4/TiOEcatalyst can be used for NO oxidization in the absence of either SO： or H2O.

关 键 词：一氧化氮催化氧化CuCoOx/TiO2 尖晶石 

分 类 号：X511[环境科学与工程—环境工程]