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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); Zhang J(张静); Xie YN(谢亚宁); Hu TD(胡天斗)
2005
Source PublicationACTA PHYSICO-CHIMICA SINICA
Volume21Issue:1Pages:#REF!
Corresponding AuthorDong, P (reprint author), Beijing Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China.
SubtypeArticle
AbstractBy 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.
KeywordXAFS (X-ray absorption fine structure) TiO2-SiO2 sol-gel impregnation CVD catalyst
Subject AreaChemistry
DOI10.3866/PKU.WHXB20050107
Indexed BySCI
WOS SubjectChemistry, Physical
WOS IDWOS:000226537000007
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Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/225635
Collection多学科研究中心
Recommended Citation
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!.
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