环己烷催化氧化制取顺酐和醋酸的催化剂研究

为研究气态环己烷催化氧化制取顺酐及醋酸的新反应，采取不同的方法制备了系列固体VPO催化剂.借助XRD、FT-IR对催化剂进行了主体晶相确定，用氧化还原滴定方法测定了不同晶相催化剂中钒的平均氧化数.结合催化反应的活性评价，发现催化剂主体晶相、结晶度、活化气氛和催化剂的V4＋/V5＋比均对目标反应的催化活性产生影响，5种催化剂中以(VO)2P2O7晶相催化剂的活性为最高.

Investigation of VPO Catalyst Transforming Gaseous Cyclohexane into Maleic Anhydride and Acetic Acid

In order to investigate the new reaction concerning the transformation of gas-cyclohexane into maleic anhydride and acetic acid, various solid VPO catalysts were prepared by different preparation methods. The main crystalline phase of the catalysts and the average oxidation value of vanadium in the catalysts were determined respectively by XRD、FT-IR and chemical titration. Experiment results revealed that the main crystalline phase, crystallization，activation ambience, and V4＋/ V5＋ ratio in the catalysts affected catalytic activity and selectivity. The catalysts whose main crystalline phase is (VO)2P2O7 possessed high crystallinity and feasible V4＋/ V5＋ ratio. (VO)2P2O7 calcinated in reaction ambience occupied higher selectivity.