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Role of the support on the behavior of Ag-based catalysts for NH3 selective catalytic oxidation (NH3-SCO)
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
2014-10-15
DOI10.1016/j.apsusc.2014.08.023
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
关键词[WOS]SILVER-BASED CATALYSTS ; AG/CEO2 CATALYSTS ; CO OXIDATION ; REDUCTION ; NO ; AG/AL2O3 ; AMMONIA ; TEMPERATURE ; NITROGEN ; SCR
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.
语种英语
WOS记录号WOS:000343329100052
引用统计
被引频次:15[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/145897
专题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
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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.
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