Catalytic oxidation of cyclohexane with dioxygen over boehmite supported trans-A2B2 type metalloporphyrins catalyst

• Trans-A2B2 type metalloporphyrins show catalytic activity in cyclohexane oxidation.
• Boehmite supported trans-A2B2-metalloporphyrins present better catalytic performance.
• MsDClPPCl/BM catalysts are easy to recover and keep at the same activity in recycling.

Metalloporphyrin-catalysed direct functionalization of saturated CH bonds is one among the topical and challenging areas within the chemical industry. In this work, three types of unsupported and boehmite supported trans-A2B2-metalloporphyrin chloride complexes (Co-D(p-Cl)PPCl, Fe-D(p-Cl)PPCl, Mn-D(p-Cl)PPCl) were prepared and characterized. It has been found that these trans-A2B2-metalloporphyrins have high catalytic activity in cyclohexane oxidation under dioxygen. The boehmite supported metalloporphyrins show better catalytic performance and are more stable than unsupported metalloporphyrins. Among these supported metalloporphyrin catalysts, Co-D(p-Cl)PPCl/BM was better than Fe-D(p-Cl)PPCl/BM and Mn-D(p-Cl)PPCl/BM, the cyclohexane conversion and selectivity to KA oil are 6.83% and 83.30%, respectively, and the turnover number is 1.05 × 107. The Co-D(p-Cl)PPCl/BM catalyst can be facilely recovered and was recycled up to six times without significant decrease in catalytic performance.

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