In-situ synthesis of ZSM-5 on silica gel and studies on its catalytic activity

ZSM-5 was in-situ synthesized on silica gel using n-butylamine as the template and characterized by XRD, SEM, FT-IR and N2 adsorption. The results indicated that the synthesized sample not only has a composite structure with ZSM-5 and silica gel, but also retains the shape of silica gel microsphere. To obtain detailed information on the rules of synthesized chemistry, the effects of SiO2/Al2O3 of initial gel, H2O/SiO2, BuNH2/SiO2, OH−/SiO2, crystallization time and crystallization temperature on ZSM-5 crystallinity were systematically studied. The composite materials were tested in a micro fixed-bed reactor, using Daqing Vacuum Gasoline Oil (VGO) as the feedstock. The results indicated that the composite structure zeolite yields more light olefins and has good selectivity to light olefins.