Study of cracking of large molecules over a new type meso-ZSM-5 composite zeolite

A new type meso-ZSM-5 composite zeolite with interconnected macropores and skeletons under hydrothermal conditions was prepared through zeolite degraded method. The skeletons can be templated to the morphology of network in different conditions. The physical properties of the meso-ZSM-5 composite zeolite were characterized by XRD, IR, SEM and nitrogen sorption techniques. Catalytic tests show that the meso-ZSM-5 composite zeolite catalyst exhibits high catalytic activity compared with the conventional microporous ZSM-5 zeolites for catalytic cracking of 1,3,5-triisopropylbenzene. The high 1,3,5-triisopropylbenzene conversion are mainly assigned to the presence of the hierarchical porosity of the pore walls. The macropores offer easier transport and access to the active sites and the macroporous walls built by ZSM-5 crystals provide the acidic sites for reaction.