Characterization and catalytic properties of aerogel chromium oxide supported by alumina or silica

被引：4

作者：

Khaddar-Zine, S ^{[1
]}

Ghorbel, A

Naccache, C

机构：

[1] Inst Preparatoire Etud Ingn Nabeul, El Merazka 8000, Nabeul, Tunisia

[2] Fac Sci Tunis, Dept Chim, Lab Chim Mat & Catalyse, Tunis 1060, Tunisia

[3] Inst Rech Catalyse, F-69626 Villeurbanne, France

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2000年 / 19卷 / 1-3期

关键词：

chromium oxide; alumina; silica; aerogel;

D O I：

10.1023/A:1008729815266

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Alumina or silica supported chromium oxide catalysts prepared by sol-gel technique have been investigated by X-ray diffraction, BET analysis, combined diffuse reflectance spectroscopy, EPR and reduction-extraction by ethane 1,2 diol. The results reveal the presence of Cr3+, Cr5+ and Cr6+ ions. Chromium species Cr6+ are isolated and atomically dispersed on the alumina support as free chromate CrO42- while on silica, dichromate or polychromate species like Cr2O72- or Cr3O102- predominate. Chromium oxide exhibits a better catalytic properties for paraxylene partial oxidation, when it is supported on alumina. The difference of oxidation states and degree of oligomerisation of chromium on the two supports affects the catalytic properties.

引用

页码：637 / 641

页数：5

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