ESR characterization of vanadium centers supported on Al-containing mesoporous silica

被引：2
作者：
Bastardo-Gonzalez, E
Jones, W
Bahranowski, K
Labanowska, M
Serwicka, EM
机构：
[1] Polish Acad Sci, Inst Catalysis & Surface Chem, PL-30239 Krakow, Poland
[2] Jagiellonian Univ, Fac Chem, PL-30063 Krakow, Poland
[3] Acad Min & Met, Fac Geol Geophys & Environm Protect, PL-30059 Krakow, Poland
[4] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2001年 / 50卷 / 01期
关键词：
ESR; vanadium; mesoporous silica; HMS; MMS;
D O I：
10.1016/S1387-1811(01)00435-8
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The properties of Al-substituted mesoporous silicas modified with VO2+, ions in a one-step exchange reaction in aqueous medium have been investigated by means of ESR. The vanadium centers exist at the surface in a well dispersed form. ESR identifies two types of vanadyl ions: (a) fully hydrated VO2+ ions, retaining motional freedom at room temperature, and (b) species firmly bound to the surface due to the formation of inner-sphere complexes. The contribution of the latter increases with Al substitution. The phenomenon is discussed in terms of a gradual modification of the surface properties as a result of Al incorporation. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：61 / 68
页数：8
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