Preparation and characterization of thermally stable high surface area mesoporous vanadium oxides

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• 作者：Mingwei Xue ; Hui Chen ; Jiazhen Ge ; Jianyi Shen
• 关键词：Mesoporous VO₂ ; Layered structure ; Microcalorimetric adsorption ; Selective oxidation of toluene
• 刊名：Microporous and Mesoporous Materials
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：131
• 期：1-3
• 页码：37-44
• 全文大小：1253 K

文摘

Vanadium oxides with high surface areas are desirable for the applications in catalysis and lithium batteries. A new method has been developed in this work for the preparation of mesoporous VO₂ with the surface area of about 180 m²/g and slit-shaped mesopores. In this simple method, V₂O₅ was first dissolved in aqueous solution of H₂O₂ and the solution was evaporated at 353 K to form a gel with layered structures. After being dried in n-butanol at 353 K, the layered gel intercalated with n-butanol was evacuated at 673 K to form the mesoporous VO₂. Characterizations showed that the prepared mesoporous VO₂ possessed much stronger surface acidity and redox ability than the traditional V₂O₅. Accordingly, it exhibited much higher activity than V₂O₅ for the conversion of isopropanol in air and the selective oxidation of toluene to benzaldehyde and benzoic acid. In addition, the mesoporous VO₂ displayed high thermal stability. It possessed the surface area of 130 m²/g even after the reaction of selective oxidation of toluene at 633 K.