【摘要】 利用有机相制备ＶＰＯ催化剂,在制备过程中加入聚乙二醇(ＰＥＧ)作为分散剂可有效提高ＶＰＯ催化剂的比表面积．实验中采用两种不同分子量的聚乙二醇(ＰＥＧ ６０００和ＰＥＧ １００００),所得ＶＰＯ催化剂的比表面积分别为５２与５４ ｍ２/ｇ,而不加聚乙二醇的ＶＰＯ催化剂其比表面积仅为１９ ｍ２/ｇ．ＸＲＤ,ＸＰＳ及ＦＴＩＲ的结果表明,催化剂的主要晶相均为(ＶＯ)２Ｐ２Ｏ７,但两类催化剂的微观结构有所不同．正丁烷选择氧化生成马来酐的催化反应结果表明,３８５℃时加聚乙二醇制备的ＶＰＯ催化剂其丁烷的转化率为８４%~８６%．马来酸酐的选择性为７８%,而不加聚乙二醇制备的ＶＰＯ催化剂其转化率和选择性均为７１%．更多还原

【Abstract】 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.更多还原