Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures

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	Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures
	Deng YQ(邓友全); Deng YQ(邓友全)
刊名	Applied Catalysis B: Environmental
	2006
卷号	66 页码:241-248
关键词	Gold catalyst CO oxidation Green chemistry Preparation Uncalcined Unwashed
ISSN号	0926-3373
通讯作者	邓友全
中文摘要	Supported Au catalysts Au-Au+-Clx/Fe(OH)y (x＜4, y≤3) and Au-Clx/Fe2O3 prepared with co-precipitation without any washing to remove Cl- and without calcining or calcined at 400 ℃ were studied. It was found that the presence of Cl had little impact on the activity over the unwashed and uncalcined catalysts; however, the activity for CO oxidation would be greatly reduced only after Au-Au+-Clx/Fe(OH)y was further calcined at elevated temperatures, such as 400 8C. XPS investigation showed that Au in catalyst without calcining was composed of Au and Au+, while after calcined at 400 8C it reduced to Au0 completely. It also showed that catalysts precipitated at 70 8C could form more Au+ species than that precipitated at room temperatures. Results of XRD and TEM characterizations indicated that without calcining not only the Au nano-particles but also the supports were highly dispersed, while calcined at 400 8C, the Au nano-particles aggregated and the supports changed to lump sinter. Results of UV–vis observation showed that the Fe(NO3)3 and HAuCl4 hydrolyzed partially to form Fe(OH)3 and [AuClx(OH)4 x] (x = 1–3), respectively, at 70 ℃, and such pre-partially hydrolyzed iron and gold species and the possible interaction between them during the hydrolysis may be favorable for the formation of more active precursor and to avoid the formation of Au–Cl bonds. Results of computer simulation showed that the reaction molecular of CO or O2 were more easily adsorbed on Au+ and Au0, but was very difficultly absorbed on Au . It also indicated that when Cl- was adsorbed on Au0, the Au atom would mostly take a negative electric charge, which would restrain the adsorption of the reaction molecular severely and restrain the subsequent reactions while when Cl was adsorbed on Au+ there only a little of the Au atom take negative electric charge, which resulting a little impact on the activity.
学科主题	物理化学
收录类别	SCI
资助信息	the National Natural Science Foundation of China (No. 20173068)
语种	英语
公开日期	2013-08-27
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/3669]
专题	兰州化学物理研究所_绿色化学研究发展中心
通讯作者	Deng YQ(邓友全); Deng YQ(邓友全)
推荐引用方式 GB/T 7714	Deng YQ,Deng YQ. Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures[J]. Applied Catalysis B: Environmental,2006,66:241-248.
APA	邓友全,&邓友全.(2006).Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures.Applied Catalysis B: Environmental,66,241-248.
MLA	邓友全,et al."Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures".Applied Catalysis B: Environmental 66(2006):241-248.