关键词: 环己烷, 环己酮, 环己醇, 氧化催化剂, 分子筛

Abstract: Selective oxidation of cyclohexane with air to form cyclohexanol and cyclohexanone over Au-Co/HZSM-5 catalyst prepared by impregnation-precipitation method was investigated, and without organic solvent or activator was involved. Results showed that the best activity was obtained with a catalyst having cobalt and gold dosage of 5.0% and 0.3%, respectively. Using such catalyst under the conditions of a reaction pressure of 4.0 MPa, a reaction temperature of 410 K and a reaction time of 300 min, the conversion of cyclohexane reached 12.4% and the total selectivity to cyclohexanol and cyclohexanone was 95.3% with a ratio of cyclohexanone to cyclohexanol of 2.6. The catalyst could be reused through washing and its activity was slightly decreased after four runs.

Key words: Cyclohexane, cyclohexanone, cyclohexanol, oxidation catalyst, molecular sieve