An alumina-supported silver catalyst with high water tolerance for H-2 assisted C3H6-SCR of NOx

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	An alumina-supported silver catalyst with high water tolerance for H-2 assisted C3H6-SCR of NOx
	Ma, Jinzhu; He, Guangzhi; Yu, Yunbo; He, Hong; Xu, Guangyan
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2017-06-15
卷号	207 期号:0 页码:60-71
关键词	Ag/al2o3 Hc-scr Water Vapor H-2 Dft
英文摘要	Water vapor is typically present in diesel engine exhausts, and thus the design of catalysts with high water-tolerance is highly desired. The addition of water vapor was shown to have quite different influences on the activity of Ag/Al2O3 catalysts with different Ag loadings during the H-2-assistedC(3)H(6)-SCR of NOx (H-2-C3H6-SCR). The 2 wt% Ag/Al2O3 catalyst showed the best activity for H2-C3H6-SCR, with excellent water resistance over the whole temperature range. An enhancement in NOx conversion was observed after water vapor was introduced, particularly at low temperatures. Over this catalyst, kinetic studies confirmed that H2O addition did not change the apparent activation energy for NOx reduction, while it increased the reaction order of C3 H-6 from -0.62 to 0.73. This result indicated that the reaction pathway for NOx reduction was hardly changed by the introduction of water vapor, while a poisoning effect related to C3H6 oxidation was decreased. In situ DRIFTS studies and DFT calculations revealed that water vapor significantly inhibits the formation of inert formate during the H2-C3H6-SCR process, and thus more sites are available for the formation of active enolic species and acetates, finally leading to increased activity for 2 wt% Ag/Al2O3 in NOx reduction. (C) 2017 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39185]
专题	生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	Ma, Jinzhu,He, Guangzhi,Yu, Yunbo,et al. An alumina-supported silver catalyst with high water tolerance for H-2 assisted C3H6-SCR of NOx[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,207(0):60-71.
APA	Ma, Jinzhu,He, Guangzhi,Yu, Yunbo,He, Hong,&Xu, Guangyan.(2017).An alumina-supported silver catalyst with high water tolerance for H-2 assisted C3H6-SCR of NOx.APPLIED CATALYSIS B-ENVIRONMENTAL,207(0),60-71.
MLA	Ma, Jinzhu,et al."An alumina-supported silver catalyst with high water tolerance for H-2 assisted C3H6-SCR of NOx".APPLIED CATALYSIS B-ENVIRONMENTAL 207.0(2017):60-71.