Abstract
ZSM-5 zeolites have been synthesized using tri-ethyl-n-propylammonium (TEPA) cations as the source of the organic base. X-ray diffraction, framework i.r. spectroscopy, scanning electron microscopy, adsorption of n-heptane and cyclohexane and product distribution in the conversion of methanol to hydrocarbons have been utilized in characterizing the synthesized zeolite. The rates of both nucleation and growth of ZSM-5 crystals are lower when TEPA rather than tetrapropylammonium (TPA) cation is used. The amount of cyclohexane (but not n-heptane) adsorbed on the ZSM-5 zeolite (prepared by the TEPA route) decreases at increased SiO 2 /Al 2 O 3 ratios. Under certain conditions, the ZSM-5 zeolite (in both the TPA and TEPA systems) undergoes transformation into α -quartz.
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