Abstract
ZSM-11/5 composite zeolite was successfully synthesized through the addition of cetyltrimethylammonium bromide (CTAB) and seed, but in the absence of template. However, without the addition of CTAB, pure large hexagonal ZSM-5 crystals were formed in the presence of ZSM-11 as seed. The products were characterized by SEM, XRD, XRF, 27Al NMR, 27Si NMR, N2 physical adsorption and NH3-TPD. The SEM images imply that large ZSM-5 crystals gradually evolve from imperfect to perfect crystals, rather than forming small crystals first, and then gradually growing. The ZSM-11/5 composite zeolite exhibited hierarchical characteristics with higher specific surface areas, higher external surface areas, higher mesopore volumes and more acid sites than the sample synthesized by the conventional method with tetrabutylammonium as template. The ZSM-11/5 composite zeolite also exhibited excellent catalytic properties in the reaction of methanol to hydrocarbons.
Published Version
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