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学科主题: 物理化学
题名: Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde
作者: Chen, Dan1;  Qu, Zhenping1;  Shen, Shijin1;  Li, Xinyong1;  Shi, Yong1;  Wang, Yi1;  Fu, Qiang2;  Wu, Jingjing2
通讯作者: ZhenpingQu
关键词: Support ;  Ag based catalysts ;  Formaldehyde ;  TPD ;  TPSR
刊名: CATALYSIS TODAY
发表日期: 2011-10-25
DOI: 10.1016/j.cattod.2011.03.059
卷: 175, 期:1, 页:338-345
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 502
产权排名: 2,7
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
摘要: Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Temperature programmed desorption (TPD) and temperature programmed surface reaction (TPSR) were employed to study the HCHO adsorption-desorption and the surface reaction on Ag based catalysts supported on different supports (MCM-41, SBA-15, NaY, SiO(2) and TiO(2)). According to the analysis of XRD, UV-Vis and H(2)-TPR for the as-prepared catalysts, there are four kinds of silver species on the supports, including metallic Ag particles (Ag(0)) with subsurface oxygen species, isolated Ag(+) ions, well dispersed Ag(2)O and Ag(n)(delta+) clusters. Moreover, the states, the dispersion and the amount of these silver species seem to be obviously different on different supports. No activity for HCHO oxidation is observed on any supports, and silver particles with some oxygen in bulk were more active for the adsorption and activation of HCHO. MCM-41 and SiO(2) supported silver catalysts give new adsorption sites for HCHO, and it is easily activated at lower temperatures and shows better surface reaction activity for HCHO oxidation. The desorption temperature for HCHO over SBA-15 and NaY supported silver catalysts is relatively higher, and its reaction performance is worse. However no surface reaction is observed on Ag/TiO(2) catalyst during experiments. It is also found that HCHO molecular adsorbed on silver sites could be was oxidized into dioxymethylene (DOM) and formate surface species, and they reacts with oxygen to form CO(2) during TPSR. The activities of different silver based catalysts for HCHO oxidation were closely related to their abilities for the formation of DOM and formate species. (C) 2011 Elsevier B.V. All rights reserved.
关键词[WOS]: SUBSURFACE OXYGEN ;  ALUMINA CATALYSTS ;  CO OXIDATION ;  AG CATALYSTS ;  AMBIENT-TEMPERATURE ;  SELECTIVE REDUCTION ;  ROOM-TEMPERATURE ;  AU CATALYSTS ;  METHANE ;  SURFACE
语种: 英语
WOS记录号: WOS:000295735400048
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115501
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, Key Lab Ind Ecol & Environm Engn MOE, Sch Environm Sci & Technol, Dalian 116024, Linggong, Peoples R China
2.Chinese Acad Sci, State Key Lab Catalysis, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Chen, Dan,Qu, Zhenping,Shen, Shijin,et al. Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde[J]. CATALYSIS TODAY,2011,175(1):338-345.
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