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

doi:10.1016/S1872-2067(18)63054-2

Abstract

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

Jun Yang, Yupeng Chang, Weili Dai, Guangjun Wu, Naijia Guan, Landong Li. Bimetallic Cr-In/H-SSZ-13 for selective catalytic reduction of nitric oxide by methane[J]. Chinese Journal of Catalysis, 2018, 39(5): 1004-1011.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63054-2

https://www.cjcatal.com/EN/Y2018/V39/I5/1004

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