发现离子液体[CH3(OCH2CH2)nN+Et3][CH3SO3–](ILPEG, n =12,16,22)具有临界溶解温度特性,据此确证了以 ILPEG 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.
Through the study of the critical solution temperature of ionic liquids [CH3(OCH2CH2)nN+Et3][CH3SO3–] (ILPEG, n = 12, 16, 22), ILPEG-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 condi-tions, 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.
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