【摘要】 采用三甲基氯硅烷并通过控制水的添加量对硅铝比分别为25,42和101的HZSM-5沸石进行外表面修饰,制得三种两亲性沸石样品.水的添加量对沸石催化剂的两亲性有显著影响.红外光谱和低温氮吸附等测试结果表明,两亲性沸石样品具有与各自母体沸石相似的酸性及略小的比表面积.在环己烯水合及乙酸异戊酯水解的相界面反应中,两亲性沸石分布于水-油两相界面,并表现出明显高于各自母体沸石的催化活性.硅铝比为42的两亲性HZSM-5样品表现出最佳的相界面催化性能.相对于环己烯水合反应,两亲性HZSM-5沸石更适用于乙酸异戊酯水解的相界面催化反应.更多还原

【Abstract】 Amphiphilic HZSM-5 zeolite particles with Si/Al ratios of 25,42 and 101 were prepared by partial modification of the external surfaces of the HZSM-5 zeolite with trimethylchlorosilane.The amount of water added during the preparation influences the amphiphilic properties of the zeolites.The results of IR spectroscopy and N₂ adsorption indicate that these amphiphilic zeolite samples have the similar acidity and a little smaller surface area compared to their parent zeolites.In the phase-boundary reactions of cyclohexene hydration and isoamyl acetate hydrolysis,these amphiphilic zeolite particles are oriented at the aqueous-organic phase boundary and exhibit catalytic activity obviously superior to the parent zeolites.The amphiphilic HZSM-5 with a Si/Al ratio of 42 shows the best catalytic performance.Furthermore,the amphiphilic HZSM-5 is a more effective phase-boundary catalyst for the isoamyl acetate hydrolysis than for the cyclohexene hydration.更多还原