Abstract
ZSM-22 hollow spheres (ZSM-22-HSs) were fabricated by a novel two-stage hydrothermal method. The structure of the zeolites were characterized by XRD, XRF, SEM, TEM and N2 adsorption-desorption. ZSM-22 nanorods were formed in first-stage crystallization, and self-assembled to form hollow spheres with intercrystalline mesopores in second-stage crystallization assisted by cetyltrimethylammonium bromide. Hierarchical pore structures for ZSM-22-HSs was also well developed by this method. The formation of these ZSM-22-HSs may be due to the developed grain boundaries of ZSM-22 nanorods.
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