添加WO_3对铈钴催化剂CO氧化性能的影响  

Effect of addition WO_3 to cerium-cobalt catalysts on carbon monoxide catalytic oxidation performance

作　　者：史蕊[1] 李坚[1] Shi Rui;Li Jian(Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学区域大气复合污染防治北京市重点实验室,北京100124

出　　处：《工业催化》2018年第3期39-44,共6页Industrial Catalysis

摘　　要：采用共沉淀法制备xWO_3-Ce O2-Co_3O_4复合型非贵金属CO低温催化剂,考察不同WO_3添加量和空速对催化剂催化活性的影响,并考察催化剂的抗硫性能。通过孔隙结构测试、H2-TPR、FT-IR和SEM等对催化剂进行表征。结果表明,WO_3添加质量分数1%时,催化剂具有最佳的低温活性。在CO进口体积分数0.12%、O2进口体积分数5%和空速15 000 h-1条件下,50℃时,CO转化率即可达到99.6%,60℃时,CO转化率达100%。添加WO_3,催化剂氧化能力增强,催化效率提高。随着空速升高,CO转化率下降。WO_3的加入可有效提高催化剂的比表面积,抑制硫酸盐在催化剂表面聚集,提高催化剂的抗硫性能。xWO3-CeO2-Co3O4 catalysts for low temperature oxidation of carbon monoxide were prepared by coprecipitation method and characterized by pore structure test,H2-TPR,FT-IR,SEM. The effects of WO3 content and space velocity on activity were investigated. Sulphur resistance of catalyst was also studied. The research showed that the catalyst with 1% WO3 addition had the best activity for low-temperature CO catalytic oxidation. The CO conversion could reach 99. 6% at 50 ℃ and 100% at 60 ℃under the condition of inlet CO concentration of 0. 12%,O2 volume fraction of 10%,and space velocity of15 000 h-1. Adding WO3 to Ce O2-Co3 O4 could increase catalysts oxidation ability and catalyst efficiency. CO conversion decreased with increasing space velocity. The addition of WO3 could effectively improve the specific surface area of catalyst,inhibit aggregation of sulfate on catalysts surface and improve sulfur resistance of the catalysts.

关 键 词：催化化学 CO催化氧化 CO低温催化剂 WO3 CO3O4 抗硫性能 

分 类 号：O643.36[理学—物理化学] X51[理学—化学]