Abstract:

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.

摘要：

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。