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题名: Role of the support on the behavior of Ag-based catalysts for NH3 selective catalytic oxidation (NH3-SCO)
作者: Qu, Zhenping1;  Wang, Hui1;  Wang, Shudong2;  Cheng, Hao2;  Qin, Yuan1;  Wang, Zhong1
关键词: NH3-SCO ;  UV-vis ;  Silver species ;  Support ;  N-2/N2O formation
刊名: APPLIED SURFACE SCIENCE
发表日期: 2014-10-15
DOI: 10.1016/j.apsusc.2014.08.023
卷: 316, 页:373-379
收录类别: SCI
文章类型: Article
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
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.
关键词[WOS]: SILVER-BASED CATALYSTS ;  AG/CEO2 CATALYSTS ;  CO OXIDATION ;  REDUCTION ;  NO ;  AG/AL2O3 ;  AMMONIA ;  TEMPERATURE ;  NITROGEN ;  SCR
语种: 英语
WOS记录号: WOS:000343329100052
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145897
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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.
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