硅烷化凹凸棒黏土负载杂多酸盐催化环己烷氧化反应

摘要

Heteropolyacid salts catalysts supported on silylated attapulgite were prepared by incipient wetness impregnation and characterized by XRD, BET, FTIR. The effects of the amount of H2O2, heteropolyacid salts catalysts loading and recycling times on cyclohexane oxidation was evaluated. The results show that the supported CoH7P2Mo15V3O62 enhanced cyclohexane oxidation. Recycle catalyst can be directly reused after drying, and catalytic activity was not significantly reduced. Under the optimal conditions, the conversion of cyclohxane was 35.28 % and the total yield of cyclohexanol and cyclohexanone was 12.48%. Experiments showed that the supported CoH7P2Mo15V3O62 heteropolyacid salts was one kind of promising catalyst, which could facilitate separation of products, require few pieces of equipment and cause less environmental pollution.%以硅烷化凹凸棒黏土为载体，满孔浸渍法制备了负载型杂多酸盐催化剂，采用X射线衍射、比表面积测定、傅里叶变换红外光谱等手段对催化剂进行了表征。分别考察了双氧水用量、杂多酸盐负载量及循环使用次数等因素对环己烷氧化反应的影响。结果表明，负载型杂多酸盐CoH7P2Mo15V3O62能显著提高环己烷氧化能力；催化剂回收烘干后可直接重复利用，催化活性没有明显降低。在优化条件下，环己烷转化率达到35.28％，目标产物环己醇和环己酮的总收率达到12.48％。实验表明，负载型杂多酸盐CoH7P2Mo15V3O62是一种具有应用前景的催化剂，便于与产物分离，且对设备和环境污染小。