Role of the support on the behavior of Ag-based catalysts for NH3 selective catalytic oxidation (NH3-SCO)

	Role of the support on the behavior of Ag-based catalysts for NH3 selective catalytic oxidation (NH3-SCO)
	Qu, Zhenping 1; Wang, Hui 1; Wang, Shudong 2; Cheng, Hao 2; Qin, Yuan 1; Wang, Zhong 1
刊名	applied surface science
	2014-10-15
卷号	316 页码:373-379
关键词	NH3-SCO UV-vis Silver species Support N-2/N2O formation
英文摘要	in this work four supports with different textural properties (al2o3, sio2, nay and tio2) are used to evaluate the formation of different silver species and their effect on the nh3-sco performance. characterization analyses have shown that the predominant ag-0 species and the oxidized ag species ag+ and ag-n(delta+)) are located on the four catalysts with different ratio of ag-0/oxidized ag. small ag-0 particle with high dispersion which is obtained on 10 wt% ag/al2o3 (5 nm, ag-0 ratio = 97.7%) shows an excellent catalytic performance for sco reaction at low temperatures a complete nh3 conversion at 180 degrees c and a high n-2 selectivity of 89%). in addition, a certain amount of oxidized ag species formed on the catalysts, especially for the nay and sio2 support, as well as the surface acidity of catalysts have also been found to play an important role in the enhanced n-2 selectivity above 140 degrees c by promoting iscr reaction involving no as an intermediate for n-2 formation. a model to relate the silver species with the performance of nh3-sco is proposed, which is very significant for the further optimization of the catalyst (e.g. choosing a suitable support) for nh3-sco reaction and its practical application in the future. (c) 2014 elsevier b.v. all rights reserved.
WOS标题词	science & technology ; physical sciences ; technology
类目[WOS]	chemistry, physical ; materials science, coatings & films ; physics, applied ; physics, condensed matter
研究领域[WOS]	chemistry ; materials science ; physics
关键词[WOS]	silver-based catalysts ; ag/ceo2 catalysts ; co oxidation ; reduction ; no ; ag/al2o3 ; ammonia ; temperature ; nitrogen ; scr
收录类别	SCI
语种	英语
WOS记录号	WOS:000343329100052
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/145897]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn MOE, Dalian 116024, Peoples R China 2.Dalian Inst Chem Phys, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Qu, Zhenping,Wang, Hui,Wang, Shudong,et al. Role of the support on the behavior of Ag-based catalysts for NH3 selective catalytic oxidation (NH3-SCO)[J]. applied surface science,2014,316:373-379.
APA	Qu, Zhenping,Wang, Hui,Wang, Shudong,Cheng, Hao,Qin, Yuan,&Wang, Zhong.(2014).Role of the support on the behavior of Ag-based catalysts for NH3 selective catalytic oxidation (NH3-SCO).applied surface science,316,373-379.
MLA	Qu, Zhenping,et al."Role of the support on the behavior of Ag-based catalysts for NH3 selective catalytic oxidation (NH3-SCO)".applied surface science 316(2014):373-379.