Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (8): 1550-1558.doi: 10.3866/PKU.WHXB201406031

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

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).

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