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通过三甲基氯硅烷(TMS)对沸石表面进行修饰,制得了两亲性沸石样品TMS-Hβ,TMS-HY和TMS-HZSM-5,并采用X射线衍射、红外光谱、水饱和吸附量测定和酸碱滴定等手段对改性样品进行了表征.TMS对这三种母体沸石的改性结果有所不同:对于HZSM-5沸石,TMS仅在外表面修饰;对于Hβ沸石,少量TMS进入沸石孔道;而对于HY沸石,TMS则导致沸石结构部分坍塌.两亲性TMS-HZSM-5和TMS-Hβ沸石在乙酸异戊酯相界面水解反应中表现出明显优于各自母体沸石的催化性能.两亲性沸石表面硅烷基的稳定性对其催化性能有一定的影响.相对于TMS-HZSM-5沸石,TMS-Hβ沸石表面硅烷基的稳定性较强;在较高的相界面反应温度下,TMS-Hβ样品仍能维持两亲性能,表现出较高的催化活性.
The amphiphilic zeolite samples TMS-Hβ, TMS-HY and TMS-HZSM-5 were prepared by trimethychlorosilane (TMS). The X-ray diffraction, And acid-base titration were used to characterize the modified samples.The results of TMS modification on these three kinds of parent zeolites were different: TMS was only modified on the outer surface for HZSM-5 zeolites; for Hβ zeolites, a small amount of TMS entered the zeolite pores TMS-HZSM-5 and TMS-Hβ zeolites exhibited better catalytic performance than zeolites in the hydrolysis of isopentyl acetate phase, respectively.While TMS led to the collapse of zeolite structure for HY zeolite, the amphiphilic TMS- The stability of the silane groups on the surface of the amphiphilic zeolites has a certain influence on the catalytic performance of the zeolites.Compared with the TMS-HZSM-5 zeolites, the stability of the silane groups on the surface of TMS-Hβ zeolites is relatively strong.Under the higher phase reaction temperature, TMS-Hβ samples can still maintain amphiphilic performance, showing higher catalytic activity.