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学科主题物理化学
Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde
Chen, Dan1; Qu, Zhenping1; Shen, Shijin1; Li, Xinyong1; Shi, Yong1; Wang, Yi1; Fu, Qiang2; Wu, Jingjing2; ZhenpingQu
关键词Support Ag Based Catalysts Formaldehyde Tpd Tpsr
刊名CATALYSIS TODAY
2011-10-25
ISSN待补充
DOI10.1016/j.cattod.2011.03.059
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
研究领域[WOS]Chemistry ; Engineering
关键词[WOS]SUBSURFACE OXYGEN ; ALUMINA CATALYSTS ; CO OXIDATION ; AG CATALYSTS ; AMBIENT-TEMPERATURE ; SELECTIVE REDUCTION ; ROOM-TEMPERATURE ; AU CATALYSTS ; METHANE ; SURFACE
英文摘要Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde; 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.
语种英语
WOS记录号WOS:000295735400048
引用统计
被引频次:65[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/321008/115501
专题中国科学院大连化学物理研究所
通讯作者ZhenpingQu
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
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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.
APA Chen, Dan.,Qu, Zhenping.,Shen, Shijin.,Li, Xinyong.,Shi, Yong.,...&ZhenpingQu.(2011).Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde.CATALYSIS TODAY,175(1),338-345.
MLA Chen, Dan,et al."Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde".CATALYSIS TODAY 175.1(2011):338-345.
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