Studies on Selectively Catalytic Reduction of NOx by Methane over Ag-ZSM-5 Catalysts

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (4): 628.

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Studies on Selectively Catalytic Reduction of NO_x by Methane over Ag-ZSM-5 Catalysts

SHI Chuan^1,2, CHENG Mo-Jie¹, QU Zhen-Ping¹, YANG Xue-Feng², BAO Xin-He¹

1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
2. Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian 116024, China

Received:2001-03-21 Online:2002-04-24 Published:2002-04-24

Abstract

Abstract: Ag-ZSM-5 catalysts were investigated for the selectively catalytic reduction of NO by methanein the excess of oxygen.The adsorption properties of NO_x and the reaction of absorbed NO_x with CH₄ werestudied through TPD and TPSR measurements.NO_x was effectively and selectively reduced by CH₄ overAg-ZSM-5 catalysts.The co-adsorption of NO and O₂ over Ag-ZSM-5 catalyst led to the formation of ad-sorbed NO₃ species, which could be effectively reduced by CH₄. Even in the presence of O₂, NO₃ specieswere more reactive than O₂. The priority of CH₄ reaction with surface NO₃-species to form N₂ was clearlyobserved.

Key words: Ag-ZSM-5, CH₄, Selective reduction, NO₃-species

CLC Number:

O643.1

TrendMD:

SHI Chuan, CHENG Mo-Jie, QU Zhen-Ping, YANG Xue-Feng, BAO Xin-He. Studies on Selectively Catalytic Reduction of NO_x by Methane over Ag-ZSM-5 Catalysts[J]. Chem. J. Chinese Universities, 2002, 23(4): 628.

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Studies on Selectively Catalytic Reduction of NO_x by Methane over Ag-ZSM-5 Catalysts

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