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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...
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