Facile fabrication of aluminum-promoted vanadium phosphate: A highly active heterogeneous catalyst for isopropylation of toluene to cymene

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• 作者：Gobinda Chandra Behera ; K.M. Paridap> ; p>p>paridakulamani@yahoo.comp> ; D.P. Das
• 关键词：Isopropylation ; p-Cymene ; Toluene ; Vanadium phosphate
• 刊名：Journal of Catalysis
• 出版年：2012
• 期刊代码：97_00219517
• 类别：ce
• 出版时间：May, 2012
• 卷：289
• 期：Complete
• 页码：190-198
• 文件大小：1313 K

摘要

Vanadium phosphate is well known as a heterogeneous catalyst in gas phase oxidation reactions. To date, there has been little interest in carrying out liquid-phase reactions with vanadium phosphate as catalyst. Herein, we report the catalytic activity of vanadium phosphate and aluminum-promoted vanadium phosphate toward liquid-phase isopropylation of toluene to cymene. The catalysts were unambiguously characterized by X-ray diffraction, N₂ adsorption-desorption, FT-IR technique, UV-vis DRS, and FE-SEM. The total acid sites were estimated by an NH₃ TPD analyzer. XPS was used as a powerful tool to know the electronic environment of the catalysts. The optimization of the reaction was carried out by varying temperature from 75 to 150 掳C and molar ratio (toluene: isopropanol) from 1:1-1:3. Under optimum reaction conditions, 5 wt.%aluminum-promoted vanadium phosphate showed 90%conversion with 85%selectivity to p-cymene.