Issue 87, 2016

Effect of the Si/Al ratio on the performance of hierarchical ZSM-5 zeolites for methanol aromatization

Abstract

A series of hierarchical ZSM-5 zeolites with different Si/Al ratios were successfully prepared using a seed-deduced method and the addition of organosilicone reagents into the medial synthesis system. The crystallinity, morphology, chemical composition, acidity and textural property of the ZSM-5 zeolites were characterized using XRD, SEM, TEM, N2 adsorption, 27Al MAS NMR and NH3-TPD. The catalytic performance was evaluated in terms of methanol aromatization to investigate the effects of the Si/Al ratio on the catalyst stability and coke formation. The results indicated that despite their large external surface area and mesopore volume, a decrease in the Si/Al ratio resulted in an increase in the acidity of the zeolites, which significantly increased the coke formation and decreased their catalytic stability. The acid amount exhibits good linear correlation with the coke content, and the generalized and quantitative correlations are reported.

Graphical abstract: Effect of the Si/Al ratio on the performance of hierarchical ZSM-5 zeolites for methanol aromatization

Article information

Article type
Paper
Submitted
04 јул. 2016
Accepted
29 авг. 2016
First published
29 авг. 2016

RSC Adv., 2016,6, 83581-83588

Effect of the Si/Al ratio on the performance of hierarchical ZSM-5 zeolites for methanol aromatization

Y. Gao, B. Zheng, G. Wu, F. Ma and C. Liu, RSC Adv., 2016, 6, 83581 DOI: 10.1039/C6RA17084F

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