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The Preparation and Characterization of High SpecificSurface Area VPO Catalysts

WANG Xiao-Shu, NIE Wei-Yan, JI Wei-Jie, YAN Qi-Jie, CHEN Yi(Center for Modern Analysis, Nanjing University, Nanjing 210093, China;School of Chemistry and Chemical Engineering, Nanjing Unicersity, Nanjing 210093, China)  
The high specific surface area VPO cata1yst systems were first developed by using polyethyleneglycol(PEG) as the dispersant in the organic media. Two PEGs with different molecular weights, namely,PEG 6000 and PEG 10000, were applied to this study, and the resulted VPO catalyst had their specificsurface areas of 52 and 54 m2/g, respectively. For the VPO sample prepared without using PEG, it onlyhad a specific surface area of 19 m2/g. For partial oxidation of n-butane to maleic anhydride, it was foundthat the conversion of n-butane and the selectivity to maleic anhydride over the catalysts prepared in thepresence of PEG were 84%-87% and 78%, respectively; while over the compared sample they are only71% and 71%, respectively. The significant higher specific surface area of the PEG-synthesized samplemay in part account for the enhancement in catalytic activity.
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