Synthesis and properties of chromium containing mesoporous molecular sieves

被引：8
|
作者：
Wei, D [1 ]
Yao, NS [1 ]
Haller, GL [1 ]
机构：
[1] Yale Univ, Dept Chem Engn, New Haven, CT 06520 USA
来源：
SCIENCE AND TECHNOLOGY IN CATALYSIS 1998 | 1999年 / 121卷
关键词：
D O I：
10.1016/S0167-2991(99)80073-1
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Chromium containing MCM-41 [1,2] has been synthesized and small angle XRD and nitrogen physisorption show that the material has an uniform. mesoporous structure. The local environment of chromium ions was then characterized by diffuse reflectance UV-visible spectroscopy (DRUV) and X-ray absorption spectroscopy. It was found that the calcined material has chromium (Cr-VI) in a tetrahedral coordination sphere with oxygen. In-situ XANES show that degradation transformed chromium to octahedra and the Cr-VI species became Cr-III after thermal treatment to 500 degrees C in helium. The oxidations of alkylaromatics with tert-butyl hydroperoxide (TBHP) in chlorobenzene were also investigated.
引用
收藏
页码：239 / 244
页数：6
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