Abstract:

A series of transition metal-doped M₁-M₂ vanadium phosphorus oxide（VPO）（M₁ = Mn，M₂=Al，Mg，Ti）composite catalysts were prepared by the reduction-dipping method，and were employed to catalyze reaction of cyclohexane with nitrosyl sulfuric acid in the presence of fuming sulfuric acid. ε-caprolactam was directly obtained from such one-step catalytic process. Among them，the Mn-Al-VPO gave the best results with 17.1% of conversion and 75.6% of selectivity to ε-caprolactam. A possible mechanism is proposed.

摘要：

采用还原-浸渍法设计和制备了一系列过渡金属掺杂的还原型M₁-M₂VPO（M₂=Al、Mg、Ti）复合催化剂，应用于环己烷液相亚硝化一步合成ε-己内酰胺的反应。结果表明，己内酰胺可以通过催化环己烷亚硝化一步直接获得。在这些复合催化剂中，还原-浸渍型的Mn-AlVPO催化剂具有较佳的催化性能：环己烷的转化率为17.1%，目标产物己内酰胺的选择性高达75.6%。并对反应机理进行了初步探讨。