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通过水蒸气脱铝的方法制备含有介孔结构的超稳Y沸石(USYM),同时采用四氯化硅蒸汽脱铝方法制备了缺乏介孔的超稳Y沸石(USYSI)。采用等体积浸渍方法将金属Pd负载到载体USYM,USYSI和Al-MCM-41上用于大分子芘的加氢反应。芘加氢反应活性在USYM负载的Pd催化剂上明显高于USYSI和Al-MCM-41负载的Pd催化剂。催化剂的表征结果表明,与USYSI相比,引入到USYM沸石中的介孔结构有利于大分子芘的扩散;与Al-MCM-41相比,USYM沸石具有强酸中心有利于负载Pd催化剂对芳烃分子加氢活性的提高。
The ultrastable Y zeolite with mesoporous structure (USYM) was prepared by the dealumination of water vapor and the ultrastable zeolite Y (USYSI) lacking mesoporous was prepared by the dealumination of silicon tetrachloride vapor. Metal Pd was loaded onto supports USYM, USYSI and Al-MCM-41 using an equal volume impregnation method for the hydrogenation of macromolecular pyrene. Pyrene hydrogenation activity was significantly higher on USYM-supported Pd catalysts than on USYSI and Al-MCM-41 supported Pd catalysts. The characterization of the catalyst showed that the mesoporous structure introduced into the USYM zeolite favors the diffusion of the macromolecular pyrene compared to the USYSI zeolite. Compared with Al-MCM-41, the USYM zeolite has a strong acid site which favors the loading of the Pd catalyst onto the aromatic hydrocarbon Increased hydrogenation activity.