Mechanism of the H-2 Effect on NH3-Selective Catalytic Reduction over Ag/Al2O3: Kinetic and Diffuse Reflectance Infrared Fourier Transform Spectroscopy Studies

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	Mechanism of the H-2 Effect on NH3-Selective Catalytic Reduction over Ag/Al2O3: Kinetic and Diffuse Reflectance Infrared Fourier Transform Spectroscopy Studies
	Xu, Guangyan ; Ma, Jinzhu ; Wang, Lian ; Lv, Zhihui ; Wang, Shaoxin ; Yu, Yunbo ; He, Hong
刊名	ACS CATALYSIS
	2019-11-01
卷号	9 期号:11 页码:10489-10498
关键词	NOx NH3-SCR H-2 Ag/Al2O3 reaction mechanism
ISSN号	2155-5435
英文摘要	The mechanism of H-2-assisted NH3-selective catalytic reduction (SCR) over Ag/Al2O3 was systematically investigated by kinetic measurements and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). H-2 was an essential reactant for the NH3-SCR reaction over Ag/Al2O3, and the overall chemical reaction equation for this reaction was as follows: 2NO + 2NH(3) + 2O(2) + 3H(2) = 2N(2) + 6H(2)O. Kinetic studies indicated that this reaction obeyed the Langmuir-Hinshelwood mechanism, such that both NO and NH3 adsorbed on the Ag/Al2O3 surface before their further reaction. In situ DRIFTS experiments showed that Ag species catalytically oxidized NO to yield nitrate species, which further migrated to the Al2O3 surface. Then, the bridging and bidentate nitrates reacted with the B-NH, species to produce N-2 and H2O. Afterward, the -OH species consumed by the adsorption of B-NH, species were restored by H-2 dissociation on the metallic Ag species. Notably, the rate-determining step in the H-2-NH3-SCR reaction was the reduction of oxidized Ag species, which further governed the formation of nitrate species. The reduction of NOx primarily occurred at the surface of Al2O3, while Ag species and H-2 contributed to the oxidation of NO to generate nitrates and to the regeneration of -OH species.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43154]
专题	生态环境研究中心_大气污染控制中心
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Fujian, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Xu, Guangyan,Ma, Jinzhu,Wang, Lian,et al. Mechanism of the H-2 Effect on NH3-Selective Catalytic Reduction over Ag/Al2O3: Kinetic and Diffuse Reflectance Infrared Fourier Transform Spectroscopy Studies[J]. ACS CATALYSIS,2019,9(11):10489-10498.
APA	Xu, Guangyan.,Ma, Jinzhu.,Wang, Lian.,Lv, Zhihui.,Wang, Shaoxin.,...&He, Hong.(2019).Mechanism of the H-2 Effect on NH3-Selective Catalytic Reduction over Ag/Al2O3: Kinetic and Diffuse Reflectance Infrared Fourier Transform Spectroscopy Studies.ACS CATALYSIS,9(11),10489-10498.
MLA	Xu, Guangyan,et al."Mechanism of the H-2 Effect on NH3-Selective Catalytic Reduction over Ag/Al2O3: Kinetic and Diffuse Reflectance Infrared Fourier Transform Spectroscopy Studies".ACS CATALYSIS 9.11(2019):10489-10498.