EPR and UV-visible spectroscopic studies of alumina-supported chromium oxide catalysts

被引：32
|
作者：
Khaddar-Zine, S
Ghorbel, A
Naccache, C
机构：
[1] Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France
[2] Inst Preparatoire Etud Ingen Nabeul, El Merazka 8000, Nabeul, Tunisia
[3] Fac Sci Tunis, Dept Chim, Lab Chim Mat & Catalyse, Tunis 1060, Tunisia
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 1999年 / 150卷 / 1-2期
关键词：
EPR; oxidation state; chromium oxide catalysts;
D O I：
10.1016/S1381-1169(99)00204-6
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The oxidation state, the mobility and the molecular structure of chromium species present on CrOx-Al2O3 catalysts have been studied by combined diffuse reflectance spectroscopy, EPR and reduction-extraction by ethane 1,2 diol. CrO42- species exist on the alumina surface in the form of loosely-interacting species on hydrated surface (species A) and in the form of strongly bonded species on dehydrated Al2O3 surface species B). The CrO42- species show high mobility and are probably responsible for the formation of CrOx clusters. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：223 / 231
页数：9
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