Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (5): 1004-1011.DOI: 10.1016/S1872-2067(18)63054-2

• Articles • Previous Articles    

Bimetallic Cr-In/H-SSZ-13 for selective catalytic reduction of nitric oxide by methane

Jun Yanga, Yupeng Changa, Weili Daia, Guangjun Wua, Naijia Guana,b, Landong Lia,b   

  1. a School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300071, China;
    b Key Laboratory of Advanced Energy Materials Chemistry of the Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
  • Received:2018-02-07 Revised:2018-03-07 Online:2018-05-18 Published:2018-04-19
  • Contact: 10.1016/S1872-2067(18)63054-2
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21773127, 21722303, 21421001) and the 111 Project (B18030).

Abstract:

Bimetallic Cr-In/H-SSZ-13 zeolites were prepared by wet impregnation and investigated for selective catalytic reduction of nitric oxide by methane (CH4-SCR). Reduction-oxidation treatments led to close contact and interaction between Cr and In species in these zeolites, as revealed by transmission electron microscopy and X-ray photoelectron spectroscopy. Compared to monometallic Cr/H-SSZ-13 and In/H-SSZ-13, the bimetallic catalyst system exhibited dramatically enhanced CH4-SCR performance, i.e., NO conversion greater than 90% and N2 selectivity greater than 99% at 550℃ in the presence of 6% H2O under a high gas hourly space velocity of 75 000/h. The bimetallic Cr-In/H-SSZ-13 showed very good stability in CH4-SCR with no significant activity loss for over 160 h. Catalytic data revealed that CH4 and NO were activated on the In and Cr sites of Cr-In/H-SSZ-13, respectively, both in the presence of O2 during CH4-SCR.

Key words: Selective catalytic reduction, Nitric oxide, Methane, Cr-In/H-SSZ-13, Bimetallic catalyst