贫燃条件下丙烯选择还原NO铜基SO_4^(2-)改性钛交联蒙脱催化剂的制备与性能  

Preparation and Performance of Cu^(2+)-Ti-pillared Montmorillonite Modified by SO_4^(2-) for Selective Reduction of NO by Propene under Lean-burn Condition

作　　者：张俊豪[1] 郭锡坤[1] 贺璇[1] 

机构地区：[1]汕头大学化学系,广东汕头515063

出　　处：《精细化工》2004年第11期827-830,共4页Fine Chemicals

基　　金：广东省科技计划项目(2003C33004);汕头大学研究与发展项目(130-512042)资助~~

摘　　要：采用水热法制备钛交联蒙脱土,SO2-4改性后作为载体,担载上铜,制成铜基SO2-4改性钛交联蒙脱土(Cu Ti PILM/SO2-4)催化剂,用C3H6作还原剂,考察了贫燃条件下不同空速、不同氧浓度以及H2O对催化剂活性的影响。结果表明,SO2-4用量w(SO2-4)为30%、Cu2+担载量w(Cu2+)为5%、500℃焙烧制得的Cu Ti PILM/SO2-4催化活性高,反应温度为250℃时,能使NO转化率高达70 6%,在水蒸气存在下,NO最大转化率仅下降7 0%。Ti-pillared montmorillonite was prepared by hydrothermal synthesis method,then treated with SO^(2-)_4 to form the modified support and loaded with Cu^(2+)to form the catalyst Cu-Ti-PILM/SO^(2-)_4.The effects of O_2 concentration,space velocity and H_2O on catalytic activity of NO reduction with propene as reductant in the presence of excess oxygen were investigated.The results showed that the catalyst modified by 30% SO^(2-)_4,loaded with 5% Cu^(2+)and calcined at 500 ℃ had high catalytic activity.NO conversion was 70.6% at 250 ℃.The NO conversion only decreased by 7.0% in the presence of H_2O.

关 键 词：选择催化还原 贫燃条件 蒙脱土 汽车尾气 

分 类 号：O643.36[理学—物理化学]