A novel route to one-step formation of epsilon-caprolactam from cyclohexane and nitrosyl sulfuric acid catalyzed by VPO composites

作者：You, Kuiyi; Wu, Bohua; Mao, Liqiu; Yin, Dulin^*; Liu, Pingle; Luo, He'an

来源：Catalysis Letters, 2007, 118(1-2): 129-133.

DOI：10.1007/s10562-007-9168-8

• cyclohexane
• nitrosyl sulfuric acid
• epsilon-caprolactam
• one-step process
• VPO composite catalyst

A series of VPO composites were employed to catalyze the reaction of cyclohexane with nitrosyl sulfuric acid in the presence of fuming sulfuric acid. To our delight, epsilon-caprolactam was for the first time directly obtained through such one-step catalytic process. VPO composite catalysts were proven to be efficient for the reaction, especially, the transition metals introduced to Al-VPO composite catalysts could improve the reactions selectivity to some extent. Among them, the Mn-Al-VPO composite catalyst gave the best results with 11.65% of conversion and 34.70% of selectivity to epsilon-caprolactam. While the conversion and selectivity are too low at this time to be commercially viable, this discovery establishes a potential new single step process for making epsilon-caprolactam from cyclohexane. A reaction mechanism is proposed.

• 出版日期2007-10
• 单位湘潭大学; 湖南师范大学