焙烧温度对层柱粘土催化剂Cu/Ti-PILCs催化丙烯还原NO反应的影响  

Influence of calcination temperature on Cu/Ti-PILCs for catalytic reduction of NO by propylene

作　　者：王琪莹[1] 刘自力[1] 邹汉波[1] 吴俊荣[1] 

机构地区：[1]广州大学化学化工学院,广州510006

出　　处：《环境工程学报》2015年第11期5527-5530,共4页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21306031;21276054)

摘　　要：制备了钛层柱粘土负载铜催化剂Cu/Ti-PILCs,用于有氧条件下C3H6选择性还原NO反应,考察了焙烧温度对Cu/Ti-PILCs的催化活性、孔结构和表面活性物种状态的影响。500℃焙烧的Cu/Ti-PILCs具有最佳的催化活性。Cu/TiPILCs的孔结构在600℃焙烧温度下具有良好的热稳定性。H2-TPR和SEM显示,在500℃焙烧的Cu/Ti-PILCs上,铜物种高度分散,主要以活性物种Cu2+的形式存在。700℃焙烧引起较小孔的孔结构崩塌,使得催化剂比表面大幅降低,且高温焙烧下Cu/Ti-PILCs形成没有催化活性的铜氧化物团聚体,导致了催化活性的大幅降低。Catalysts Cu / Ti-PILCs prepared at different calcination temperatures were studied in selective catalytic reduction of NO by propylene. The influences of calcination temperature on catalytic activity,pore structure and active species of Cu / Ti-PILCs were investigated. Cu / Ti-PILCs calcined at 500℃ had best catalytic activity. The pore structure of Cu / Ti-PILCs remained good shape and stability under 600℃ calcinations. The Cu species were highly-dispersed and existed mainly as Cu2 ＋species on 500℃-calcined Cu / Ti-PILCs. Cu2 ＋species were the catalytic active components to SCR reaction. 700℃-calcined catalyst showed poor catalytic activity.Calcination at 700℃ destroyed the catalyst＇s pore structure and formed Cu O bulky aggregation which had no catalytic activity,all these resulted in the severe decrease of the SBETof catalysts and the drop of the catalytic activity.

关 键 词：NO 层柱粘土 Ti-PILCs SCR 催化剂 

分 类 号：X701[环境科学与工程—环境工程] O643[理学—物理化学]