界面活性Pd/SiO_2催化剂用于水相加氢反应

Interface-active Pd/SiO_2 catalyst for aqueous hydrogenation reactions

将Pd/SiO2进行表面疏水化修饰后,获得具有界面活性的固体催化剂,并以此作为稳定剂成功制备了气体微泡。这种微泡体系可以增加气-液反应界面,减小传质阻力,为水介质中进行的气-液-固多相反应提供了一种高效的催化反应平台。研究表明,与传统的多相反应体系相比,这种微泡催化体系在水相催化烯烃的氢化反应中显示出更高的催化活性。经过7次反应循环,催化剂活性没有明显降低。

After surface hydrophobicity modification of Pd/SiO_2,the solid interface-active Pd/SiO2 catalyst was obtained,and gasin-water microbubbles have been successfully prepared using it as stabilizer.Such a microbubble system can significantly enlarge the gas-liquid reaction interface and decrease the mass transport resistance,leading to an efficient catalytic platform for gas-involved multiphase reactions in water.The results show that the microbubble catalyst system exhibits higher catalytic activity for the hydrogenation of olefins in aqueous phase compared with conventional multiphase reactions.After seven reaction cycles,its activity has no significant decrease.