含过渡金属分子筛催化环己醇与空气氧化制备环己酮

Aerial oxidation of cyclohexanol to cyclohexanone catalyzed by transition metal-containing molecular sieve catalysts

分别采用离子交换法、水热合成法和干胶转化晶化法,将非贵过渡金属引入到分子筛中合成出含过渡金属的分子筛催化剂,并将其应用于以空气为氧化剂、多相催化环己醇合成环己酮的反应中,探索高效、环保、廉价的绿色催化氧化反应体系.研究结果表明,采用水热合成法制备的含钴分子筛(CoAlPO-5)在催化空气氧化环己醇制备环己酮的反应中表现出优异的催化活性,通过考察反应温度、空气流速、反应时间、催化剂用量等探索了最佳催化反应条件是:反应温度为100℃、空气流速为40mL/min、反应时间为8h、催化剂用量为100mg时,环己醇转化率可达到38.2%,环己酮选择性达到95.8%.

In this work, ion-exchange, hydrothermal and dry gel conversion methods have been applied to prepare transition metal-containing molecular sieve catalysts. The catalysts were applied to heterogeneous catalytic aerial oxidation of cyelohexanol to cyelohexanone, exploring efficient, environmental protection, lowpriced green catalytic oxidation reaction system. Among various catalysts, CoAlPO-5 synthesized by hydrothermal method showed the best catalytic activity in the catalytic oxidation of cyclohexanol with air to cyclohexanone. In addition, various reaction conditions, including the reaction time and temperature, the flow rate of air, the amount of catalyst used in the reaction, had also been discussed. The optimum reaction conditions were： reaction temperature 100 ℃, the air flow rate 40 mL/min, reaction time 8 h, the dosage of catalyst 100 rag. Under the condition of the reaction, cyclohexanol mole conversion rate reached 38. 2%, cyclohexanone selectivity up to 95.8%.