Realization of rapid synthesis of H-ZSM-5 zeolite by seed-assisted method for aromatization reactions of methanol or methane
- 1 November 2021
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 99 (11), 874-880
- https://doi.org/10.1139/cjc-2021-0095
Abstract
H-ZSM-5 zeolites are successfully synthesized within 1 h with organic-template-free system by the seed-assisted method. The synthetic method not only reduces the production cost of H-ZSM-5 zeolite, but also prevents the pollution of environment compared with the conventional synthesis process. Characterization by SEM, XRD, N2 adsorption-desorption, NH3-TPD and Py-IR confirms that the product of H-ZSM-5 with a high crystallinity and reveals that the rapid synthesis process in accordance with seed surface crystallization mechanism. In order to improve the aromatic selectivity on H-ZSM-5 zeolite, different concentrations of Mo and Zn catalysts were prepared by incipient wetness impregnation and ion-exchange method. Mo-Zn/H-ZSM-5-SAS-1 h have similar catalytic lifetime and higher selectivity of paraxylene in aromatics products compared with Mo-Zn/H-ZSM-5-seed in the reaction of methanol to aromatic. However, the catalytic lifetime of 6%Mo/H-ZSM-5-SAS-1 h is shorter than that of 6%Mo/H-ZSM-5-seed catalyst in methane to benzene reaction under same reaction conditions.Keywords
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