物理化学学报 >> 2014, Vol. 30 >> Issue (8): 1550-1558.doi: 10.3866/PKU.WHXB201406031

催化和表面科学 上一篇    下一篇

BaFeO3-x与Cu-ZSM-5耦合催化剂的NOx储存还原性能

吕姣龙1,2, 李锋丽1,2, 李新刚1,2   

  1. 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
  • 收稿日期:2014-04-11 修回日期:2014-05-30 发布日期:2014-07-18
  • 通讯作者: 李新刚 E-mail:xingang_li@tju.edu.cn
  • 基金资助:

    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)及教育部留学归国人员科研启动基金(2011-1568)资助项目

NOx Storage Reduction Performance of Coupled BaFeO3-x+Cu-ZSM-5 Catalyst

Lü Jiao-Long1,2, LI Feng-Li1,2, LI Xin-Gang1,2   

  1. 1. Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P. R. China;
    2. The Collaborative Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, P. R. China
  • Received:2014-04-11 Revised:2014-05-30 Published:2014-07-18
  • Contact: LI Xin-Gang E-mail:xingang_li@tju.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (U1162103, U1232118), Program for New Century Excellent Talents in University of China (NCET-10-0615), Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China (2011-1568).

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+Cu-ZSM-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 ℃,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%.

关键词: 稀燃, 耦合催化剂, 氮氧化物, 储存, 还原

Abstract:

A BaFeO3-x+Cu-ZSM-5 coupled catalyst was designed and synthesized to eliminate the NOx emitted from lean-burn exhausts, providing an alternative to the traditional noble-metal-based NOx storage reduction (NSR) catalysts. During the lean-burn 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 NOx conversion of the coupled catalyst was 98%, while the N2 selectivity was close to 100%.

Key words: Lean-burn, Coupled catalyst, NOx, Storage, Reduction

MSC2000: 

  • O643