XAFS study of the structure of the silica-supported ytterbium oxide catalyst

被引：20

作者：

Yamamoto, T ^{[1
]}

Tanaka, T ^{[1
]}

Matsuyama, T ^{[1
]}

Funabiki, T ^{[1
]}

Yoshida, S ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Engn, Dept Mol Engn, Kyoto 6068501, Japan

来源：

SOLID STATE COMMUNICATIONS | 1999年 / 111卷 / 03期

关键词：

surfaces and interfaces; crystal; structure and symmetry; EXAFS; NEXAFS;

D O I：

10.1016/S0038-1098(99)00183-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

3.4, 8.4 mmol Yb g(SiO2)(-1)) was characterized by X-ray The structure of the silica-supported ytterbium oxide catalyst (1.7 diffraction and Yb-Lm-edge XAFS. XANES and EXAFS spectra of all the catalysts were quite similar to each other but different from those of the Yb2O3 crystal. The local structure around Yb was not affected by the loading amounts of Yb and the thermal treatment up to 8.4 mmol g(SiO2)-1 and 1273 K, respectively. In the second derivatives of the XANES spectra, Yb2O3 exhibited a doublet, while all the Yb/SiO2 samples gave a singlet. The presence of Yb-O-Si linkage and the absence of Yb-O-Yb contributions were confirmed in all the Yb/SiO2 catalysts. Yb atoms were supported on SiO2 in a highly dispersed form as a YbO6 octahedron, which strongly interacted with SiO4 tetrahedra. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.

引用

页码：137 / 142

页数：6

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