Abstract: Using IM-5 zeolite by primary crystallization as parent, IM-5 zeolite with high crystallinity was prepared via secondary hydrothermal crystallization. The effects of inorganic base system and organic base system on the crystallinity, crystal morphology and pore structure of the prepared zeolite were investigated systematically, and the optimized scheme of secondary crystallization using organic base system suitable for industrial production was obtained. The physical properties of the prepared samples were analyzed by XRD, SEM, XRF and N₂ adsorption-desorption methods, and the catalytic performance of the samples was evaluated. The results show that the secondary crystallization method can effectively improve the crystallinity, specific surface area, pore volume, and crystal morphology of IM-5 zeolite, which indicates higher catalytic activity in the alkylation reaction of toluene with methanol.

Key words: IM-5 zeolite, secondary crystallization, crystallinity, catalytic performance