BaFeO3-x与Cu-ZSM-5耦合催化剂的NOx储存还原性能  

NO_xStorage Reduction Performance of Coupled BaFeO_(3-x)+Cu-ZSM-5 Catalyst

作　　者：吕姣龙 李锋丽[1,2] 李新刚[1,2] 

机构地区：[1]天津大学,化工学院,天津市应用催化科学与工程重点实验室,天津300072 [2]天津化学化工协同创新中心,天津300072

出　　处：《物理化学学报》2014年第8期1550-1558,共9页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(U1162103, U1232118);教育部新世纪优秀人才支持计划(NCET-10-0615);教育部留学归国人员科研启动基金(2011-1568)资助项目~~

摘　　要：为替代传统的贵金属基NOx储存还原(NSR)催化剂,本文设计并制备了不含贵金属的BaFeO3-x+CuZSM-5耦合催化剂,用于催化消除稀燃发动机尾气中的NOx.在稀燃阶段,NO在BaFeO3-x催化剂上发生了氧化和储存反应;在富燃阶段,从BaFeO3-x催化剂中脱附出来未能消除的NOx被置于其后的Cu-ZSM-5催化剂进一步催化消除.实验结果表明,BaFeO3-x+Cu-ZSM-5耦合催化剂的工作温度窗口被拓宽到250-400°C,同时NOx消除性能得到了显著提高:NOx转化率最高可达98%,N2选择性接近100%.A BaFeO3-x＋Cu-ZSM-5 coupled catalyst was designed and synthesized to eliminate the NO, emitted from leanburn exhausts, providing an alternative to the traditional noble-metal-based NOx storage reduction （NSR） catalysts. During the leanburn period, the NO oxidation and storage processes mainly occurred over the BaFeO3-x catalyst. During the fuel-rich period, the released NOx from the BaFeO3-x catalyst was further reduced over the Cu-ZSM-5 catalyst. Our results show that, compared with the BaFeO3-x and Cu-ZSM-5 catalyst alone, the operating temperature window of the coupled BaFeO3-x＋Cu-ZSM-5 catalyst is extended from 250 to 400℃, and its NOx elimination performance is significantly improved. The maximum NO, conversion of the coupled catalyst was 98%, while the N2 selectivity was close to 100%.

关 键 词：稀燃 耦合催化剂 氮氧化物 储存 还原 

分 类 号：O643.36[理学—物理化学] O613.61[理学—化学]