The local structure of titania-silica composite oxides

	The local structure of titania-silica composite oxides
	Yang, XG; Dong, P; Zhou, YS; Liu, T; Zhou, YS; Liu, T; Zhang, J; Xie, YN; Hu, TD; Liu T(刘涛)
刊名	ACTA PHYSICO-CHIMICA SINICA
	2005
卷号	21 期号:1 页码:#REF!
关键词	XAFS (X-ray absorption fine structure) TiO2-SiO2 sol-gel impregnation CVD catalyst
通讯作者	Dong, P (reprint author), Beijing Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China.
英文摘要	By analyzing the X-ray absorption spectra of Ti K edge, the structural information of TiO2-SiO2 composite oxides prepared by sol-gel(CTS1, CTS4), impregnation (SYB02, SYB04, SYB06), and CVD (CVD], CVD2) methods were obtained. TiO2 was most dispersed in SiO2 by the sol-gel method and TiO2 was least dispersed in SiO2 by the CVD method. The pre-edge structure of anatase(Ti K edge of XAFS) is characteristic of three peaks: A1, A2, and A3. For the sol-gel and impregnation prepared TiO2-SiO2 supports, the structure of Ti K edge is different from that of anatase. The intensity of A2 peak increases with the decrease of the content of Ti, and coordination numbers of the first shell of Ti - O increase with the increase of the content of Ti. The pre-edge absorption feature of TiO2-SiO2 prepared by CVD is consistent with that of anatase, and the coordination number of the first shell is nearly to 6. The bond lengths of the first shell of Ti - O increase with the increasing Ti content. The results were confirmed by further measurement using XRD. Based on the experimental results, a model of titania-silica composite oxide was proposed.
学科主题	Chemistry
类目[WOS]	Chemistry, Physical
收录类别	SCI
WOS记录号	WOS:000226537000007
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225635]
专题	高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Yang, XG,Dong, P,Zhou, YS,et al. The local structure of titania-silica composite oxides[J]. ACTA PHYSICO-CHIMICA SINICA,2005,21(1):#REF!.
APA	Yang, XG.,Dong, P.,Zhou, YS.,Liu, T.,Zhou, YS.,...&胡天斗.(2005).The local structure of titania-silica composite oxides.ACTA PHYSICO-CHIMICA SINICA,21(1),#REF!.
MLA	Yang, XG,et al."The local structure of titania-silica composite oxides".ACTA PHYSICO-CHIMICA SINICA 21.1(2005):#REF!.