SmMnO_(3)钙钛矿型氧化物的制备及其催化氧化甲苯性能  

Preparation of SmMnO_(3) perovskite oxide and catalytic oxidation of toluene

作　　者：胡静 周家斌 刘丹 张天磊 刘速 孙艺栖 HU Jing;ZHOU Jiabin;LIU Dan;ZHANG Tianlei;LIU Su;SUN Yixi(College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学化学化工学院,四川成都610500

出　　处：《化工环保》2022年第2期219-224,共6页Environmental Protection of Chemical Industry

基　　金：四川省科技厅重点研发项目(2020YFS0305)。

摘　　要：采用溶胶-凝胶法制备了SmMnO_(3)钙钛矿型氧化物,将其作为催化剂,在固定床反应器中研究了催化剂的焙烧温度和混合气体积空速对甲苯催化氧化效果的影响,并通过XRD、SEM、XPS、H_(2)-TPR等技术表征了催化剂的微结构及化学性质。结果表明:催化剂对甲苯的催化氧化活性随焙烧温度升高而提高;焙烧温度为800℃时制备的催化剂(SmMnO_(3)-800)对甲苯的催化氧化性能最佳,T_(50)=230℃,T_(90)=263℃,这可能归因于其较高的氧含量、较大的表面n(Mn^(4+))∶n(Mn^(3+))以及较好的低温催化氧化能力;随着混合气体积空速的增加,SmMnO_(3)-800催化剂活性有所降低;在350℃下连续反应30 h,甲苯转化率始终保持在95%以上,表明催化剂具有较好的活性稳定性。SmMnO_(3)perovskite oxide was prepared by sol-gel method and used as catalyst.The effects of calcination temperature for catalyst preparation and space velocity of gas mixture on catalytic oxidation of toluene were investigated in a fixed bed reactor.The microstructure and chemical properties of the catalyst were characterized by XRD,SEM,XPS and H_(2)-TPR.The results show that:The catalytic activity of the catalyst on toluene oxidation increases with the increase of calcination temperature;When the calcination temperature is 800℃,the prepared catalyst(SmMnO_(3)-800)has the best catalytic activity on toluene oxidation,T_(50)=230℃,T_(90)=263℃,which may be attributed to its high oxygen content,large n(Mn^(4+))∶n(Mn^(3+))on the surface and better catalytic activity at low temperature;With the increase of space velocity,the activity of SmMnO_(3)-800℃decreases;After reaction at 350℃for 30 h,the conversion rate of toluene is always above 95%,which shows good activity stability of the catalyst.

关 键 词：溶胶凝胶法 SmMnO_(3) 钙钛矿型 焙烧温度 催化氧化 甲苯 

分 类 号：X511[环境科学与工程—环境工程]