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High Resistance to Na Poisoning of the V2O5-Ce(SO4)2/TiO2 Catalyst for the NO SCR Reaction

Category: Aerosol and Atmospheric Chemistry

Volume: 18 | Issue: 12 | Pages: 2948-2955
DOI: 10.4209/aaqr.2017.11.0521
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Yanrong Chen1,2, Mingxuan Wang1,2, Xuesen Du 1,2, Jingyu Ran1,2, Li Zhang1,2, Dingling Tang3

  • 1 Key Laboratory of Low-grade Energy Utilization Technologies and Systems of the Ministry of Education of China, College of Power Engineering, Chongqing University, Chongqing 400030, China
  • 2 Institute of Energy and Environment of Chongqing University, Chongqing 400030, China
  • 3 Shanghai Minghua Electric Power Technology Engineering Co., Ltd., Shanghai 200090, China

Highlights

V2O5-Ce(SO4)2/TiO2 catalyst exhibits excellent activity of NO conversion.
V2O5-Ce(SO4)2/TiO2 catalyst shows excellent resistance to alkali metal poisoning.
V2O5-Ce(SO4)2/TiO2 catalyst shows strong redox ability and abundant acid sites.


Abstract

Poisoning by Na is one of the major issues for the commercial SCR catalyst. In this study, Ce(SO4)2 was added to the catalyst system of V2O5/TiO2 to enhance its resistance to Na poisoning. The results show that the addition of Ce(SO4)2 increases the NOx conversion of the V2O5/TiO2 catalyst at medium temperatures of 330°C–450°C. After being doped with sodium with a molar ratio of Na/V = 1/1, the V2O5-Ce(SO4)2/TiO2 catalyst still shows excellent DeNOx efficiency, about 40% higher than the commercial V2O5-WO3/TiO2 catalyst. The fresh and Na-poisoned catalysts were characterized using XRD, SEM, NH3-TPD and H2-TPR. The results show that the Ce(SO4)2 addition remarkably strengthens the surface acidity and redox ability of the V2O5/TiO2 catalyst. Furthermore, the TPD results show that the V2O5-Ce(SO4)2/TiO2 catalyst can maintain its surface acidity after being doped with Na, while the acidity of the V2O5-WO3/TiO2 catalyst dramatically decreases. The redox ability of the catalyst can also be retained more effectively when Ce(SO4)2 is added to the catalyst system.

Keywords

Selective catalytic reduction Ce(SO4)2 Redox properties Acidity Alkali poisoning resistance


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