Thermoregulated Phase-Separable Catalysis for Rh Nanoparticle Catalyzed Selective Hydrogenation of 1,5-Cyclooctadiene

Abstract

Through the study of the critical solution temperature of ionic liquids [CH 3 (OCH 2 CH 2 ) n N + Et 3 ][CH 3 SO 3 − ] (IL PEG , n = 12, 16, 22), IL PEG -stabilized Rh nanoparticle catalysts have been found to function as thermoregulated phase-separable catalysts and have been shown to be efficient and recyclable for the selective hydrogenation of 1,5-cyclooctadiene (1,5-COD) to cyclooctene (COE). Under optimized conditions, the conversion of 1,5-COD and selectivity for COE were 99% and 90%, respectively. The Rh catalyst could be recovered by simple phase separation and reused for ten times without loss of activity or selectivity. 发现离子液体 [CH 3 (OCH 2 CH 2 ) n N + Et 3 ][CH 3 SO 3 – ] (IL PEG , n = 12, 16, 22) 具有临界溶解温度特性, 据此确证了以 IL PEG 为稳定剂制得的 Rh 纳米催化剂具有温控相分离催化功能, 并将其用于 1,5-环辛二烯 (1,5-COD) 选择性加氢制环辛烯 (COE) 的反应中. 在优化的反应条件下, 1,5-COD 转化率和 COE 选择性分别为 99% 和 90%; Rh 纳米催化剂经简单分相即可与产物分离, 催化剂循环使用 10 次, 其活性和选择性无明显降低. Thermoregulated phase-separable Rh nanoparticle catalyst was shown to be efficient and recyclable for the selective hydrogenation of 1,5-cyclooctadiene.