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以超临界二氧化碳(scCO2)/聚乙二醇(PEG)两相为反应介质,双齿氮配体功能化聚乙二醇稳定的Pd纳米颗粒作为催化剂,进行了醇的需氧氧化反应.系统研究了催化剂制备条件和反应条件对苯甲醇需氧氧化反应的影响.结果表明,以氢气为还原剂制备的Pd纳米粒子的催化活性最高.反应结束后,可以利用scCO2直接进行原位萃取得到产物,实现了催化剂与产物的有效分离和催化剂的循环使用.反应中没有检测到钯的流失.催化剂经过5次循环利用后转化率仍可达98%.
The aerobic oxidation of alcohols was carried out using Pd nanoparticles stabilized with bidentate nitrogen ligand functionalized with polyethylene glycol (PEG) as the reaction medium and scCO 2 / PEG as the reaction medium. The effects of preparation conditions and reaction conditions on the aerobic oxidation of benzyl alcohol were studied.The results showed that the catalytic activity of Pd nanoparticles prepared by using hydrogen as the reducing agent was the highest.After the reaction was completed, , The effective separation of the catalyst and the product and the recycling of the catalyst were achieved, no loss of palladium was detected in the reaction, and the conversion of the catalyst was still up to 98% after being recycled for 5 times.