文章基本信息

标题：High Resistance to Na Poisoning of the V2O5-Ce(SO4)2/TiO2 Catalyst for the NO SCR Reaction
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作者：Yanrong Chen ; Mingxuan Wang ; Xuesen Du 等
期刊名称：Aerosol and Air Quality Research
印刷版ISSN：1680-8584
出版年度：2018
卷号：18
期号：12
页码：2948-2955
DOI：10.4209/aaqr.2017.11.0521
语种：English
出版社：Chinese Association for Aerosol Research in Taiwan
摘要：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.
关键词：Selective catalytic reduction;Ce(SO4)2;Redox properties;Acidity;Alkali poisoning resistance