Surface functionalization of SBA-15-ordered mesoporous silicas: Oxidation of benzene to phenol by nitrous oxide

被引：45
作者：
Li, Ying [1 ]
Feng, Zhaochi [2 ]
van Santen, R. A. [1 ]
Hensen, E. J. M. [1 ]
Li, Can [2 ]
机构：
[1] Eindhoven Univ Technol, Schuit Inst Catalysis, NL-5600 MB Eindhoven, Netherlands
[2] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
来源：
JOURNAL OF CATALYSIS | 2008年 / 255卷 / 02期
基金：
中国国家自然科学基金;
关键词：
selective oxidation; benzene; nitrous oxide; Fe-Ga-SBA-15; ordered mesoporous silica; active sites; resonance Raman spectroscopy;
D O I：
10.1016/j.jcat.2008.02.001
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：
We report the preparation and catalytic properties of highly ordered mesoporous Fe-Ga-SBA-15 materials via direct hydrothermal synthesis. Gallium and iron ions were introduced directly into the synthesis gel typical for the preparation of SBA-15. The resulting materials had hexagonally ordered mesopores of about 6 nm and surface areas >1000 m(2)/g. In Fe-SBA-15, the iron species were mainly tetrahedrally coordinated in the amorphous silica walls. In the presence of Ga (Fe-Ga-SBA-15), Fe species were located at the silica surface as isolated species, as determined by Raman and diffuse-reflectance UV-Vis spectroscopy measurements. The Fe species in Fe-Ga-SBA-15 displayed similar properties as the FeZSM-5 zeolites toward nitrous oxide decomposition and were active in the oxidation of benzene to phenol by nitrous oxide. Ga-SBA-15 and Fe-SBA-15, on the other hand, showed no catalytic activity. Compared with Fe-Al-SBA-15, Fe-Ga-SBA-15 displayed greater selectivity to the desired phenol product. (C) 2008 Elsevier Inc. All rights reserved.
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收藏
页码：190 / 196
页数：7
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