Abstract
MCM-22 zeolites with various morphology properties including BET surface area, pore volume and platelet size were synthesized using glycerin as the auxiliary chemical (AC) under dynamic hydrothermal conditions. The products had been characterized by means of XRD, BET, TG-DSC, FT-IR and SEM techniques. Depending on the amount of the auxiliary chemical, the BET specific surface area of MCM-22 could be controlled up to 483 m2·g–1. Moreover, the alkylation of benzene with propylene was carried out under liquid-phase reaction over the prepared MCM-22 zeolite. The results showed that, in the alkylation catalyzed by the MCM-22 obtained using glycerin as the AC with the molar ratio of AC/SiO2 = 1.0, the selectivity of cumene was improved to 80.8%, which was about 5.0% higher than that in the alkylation catalyzed by the material obtained without using auxiliary chemical. Finally, a conceivable mechanism of catalytic performance improvement in the presence of glycerin as the auxiliary chemical is discussed.
