Low-temperature prepared highly effective ferric hydroxide supported gold catalysts for carbon monoxide selective oxidation in the presence of hydrogen

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	Low-temperature prepared highly effective ferric hydroxide supported gold catalysts for carbon monoxide selective oxidation in the presence of hydrogen
	Deng YQ(邓友全); Deng YQ(邓友全)
刊名	Applied Catalysis A: General
	2008
卷号	340 页码:220-228
关键词	Gold catalyst CO selective oxidation Preparation Uncalcined Low-temperature
ISSN号	0926-860X
通讯作者	邓友全
中文摘要	Ferric hydroxide supported Au catalysts prepared with co-precipitation method at room temperature without any heat treatment hereafter exhibited high catalytic activity and selectivity for CO oxidation in air and CO selective oxidation in the presence of H2. With calcination temperature rising, both activity and selectivity decreased. X-ray Photoelectron Spectra (XPS) indicated that Au existed as Au0 and Au+ in the catalyst without heat treatment and even after being calcined at 200 ℃, while after being calcined at 400 ℃, Au existed as Au0 completely. X-ray Diffraction (XRD) and High Resolution Transmission Electron Microscopic (HRTEM) investigations indicated that both the supports and Au species were highly dispersed as nano or sub-nano particles even after being calcined at 200 ℃, but after being calcined at 400 ℃ the supports transformed to crystal Fe2O3 with typical diameter of 30 nm and Au species aggregated to nano-particles with typical diameter of 2–4 nm. HRTEM investigations also suggested that the supports calcined at 200 ℃ were composed of amorphous ferric hydroxide and crystal ferric oxide. Results of computer simulation (CS) showed that O2 was adsorbed on Au crystal cell and then were activated, which should be the key factor for the subsequent reaction. It also suggested that O2 species were more easily adsorbed on Au+ than on Au0, indicating that higher positive charge of the Au species possessed the higher activity for CO oxidation.
学科主题	物理化学
收录类别	SCI
语种	英语
WOS记录号	WOS:000256327600010
公开日期	2013-08-19
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/3644]
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. Low-temperature prepared highly effective ferric hydroxide supported gold catalysts for carbon monoxide selective oxidation in the presence of hydrogen[J]. Applied Catalysis A: General,2008,340:220-228.
APA	邓友全,&邓友全.(2008).Low-temperature prepared highly effective ferric hydroxide supported gold catalysts for carbon monoxide selective oxidation in the presence of hydrogen.Applied Catalysis A: General,340,220-228.
MLA	邓友全,et al."Low-temperature prepared highly effective ferric hydroxide supported gold catalysts for carbon monoxide selective oxidation in the presence of hydrogen".Applied Catalysis A: General 340(2008):220-228.