1. Poisoning Effects of HCl on MOx‐WO3/TiO2 (M=Mn, Ce and V) Catalysts for Selective Catalytic Reduction of NOx by NH3.
- Author
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Yu, Jie, Wang, Chizhong, Wang, Yazhou, Qiu, Lei, Yin, Yimeng, Li, Xing, Zhao, Feilin, and Chang, Huazhen
- Subjects
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CATALYSTS , *POISONING , *FLUE gases , *HETEROGENEOUS catalysis , *INDUSTRIAL gases , *CATALYTIC reduction - Abstract
Selective catalytic reduction of NOx by ammonia (NH3‐SCR) was affected by HCl, which was widely present in industrial flue gas. In this study, the SCR performances over MOx‐WO3/TiO2 (MW/Ti, M=Mn, Ce and V) catalysts after HCl treatment were investigated. It was found that HCl poisoning showed inhibition and promotion in NOx conversion over MnW/Ti and CeW/Ti catalysts, respectively. While the SCR activity over VW/Ti catalyst was hardly affected by HCl. Over MnW/Ti catalyst, the rupture of the Mn−O bond by the strong Mn−Cl binding induced the formation of amorphous MnCl2 species. This Cl‐containing species with Mn in a low oxidation state exhibited poorer redox ability and NO activation, resulting in a decrease in low‐temperature SCR activity. However, instead of directly affecting the CeOx and VOx sites, gaseous HCl reacted with NH3 to form NH4Cl species on the surface of CeW/Ti and VW/Ti catalysts. As a result, the SCR activity of VW/Ti catalyst was scarcely influenced by HCl, taking the unchanged redox ability and NH3 adsorption. With a further accumulation of NH4Cl on CeW/Ti catalyst, the NOx conversion at low temperature was evidently enhanced due to the promotion in NO‐to‐NO2 conversion (Fast‐SCR). [ABSTRACT FROM AUTHOR]
- Published
- 2023
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