Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde

	Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde
	Chen, Dan 1; Qu, Zhenping 1; Shen, Shijin 1; Li, Xinyong 1; Shi, Yong 1; Wang, Yi 1; Fu, Qiang 2; Wu, Jingjing 2
刊名	catalysis today
	2011-10-25
卷号	175 期号:1 页码:338-345
关键词	Support Ag based catalysts Formaldehyde TPD TPSR
ISSN号	待补充
通讯作者	zhenpingqu
产权排序	2,7
中文摘要	comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde
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.
学科主题	物理化学
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
收录类别	SCI
语种	英语
WOS记录号	WOS:000295735400048
公开日期	2012-07-09
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/115501]
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, 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
推荐引用方式 GB/T 7714	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.,...&Wu, Jingjing.(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.