Issue 9, 2024

Novel-ordered hierarchical ZSM-5 zeolite with interconnected macro–meso–microporosity for the enhanced methanol to aromatics reaction

Abstract

The methanol to aromatics (MTA) process is an attractive non-petroleum route to produce high-value aromatics but suffers from a high rate of carbon deposition and deactivation and relatively low BTX selectivity. Herein, we first prepared a three-dimensional ordered macro–mesoporous carbon material (3DOMmC) with a network structure by dropping-suction filtration. Then the obtained 3DOMmC was utilized as a hard template to synthesize the ordered hierarchical ZSM-5 zeolite with interconnected macro–meso–microporosity by bottom-up confined steam-assisted crystallization. Compared with the conventional microporous ZSM-5, the BTX selectivity and lifetime of the ordered hierarchical ZSM-5 zeolite (3DOMmC-Z5) have been greatly improved from 18.02% to 24.01% and 6.5 h to 8 h, respectively, due to the highly ordered and fully interconnected intercrystalline porous hierarchy. After that, we in situ introduced Zn into the synthesized ZSM-5 zeolite, and the BTX selectivity of 3DOMmC-Zn-Z5-0.5 was significantly improved from 24.01% to 29.9% along with a comparable lifetime (from 9 h to 8 h), which is still longer than 6.5 h for conventional catalysts. These findings mark the significance of precise tailoring of ordered hierarchical Zn-ZSM-5 zeolites with interconnected macro–meso–microporosity for enhanced catalytic conversion and product selectivity, excellent long-term catalytic stability, low coke formation in the methanol to aromatics reaction.

Graphical abstract: Novel-ordered hierarchical ZSM-5 zeolite with interconnected macro–meso–microporosity for the enhanced methanol to aromatics reaction

Supplementary files

Article information

Article type
Paper
Submitted
28 Dec 2023
Accepted
20 Mar 2024
First published
21 Mar 2024

Catal. Sci. Technol., 2024,14, 2461-2469

Novel-ordered hierarchical ZSM-5 zeolite with interconnected macro–meso–microporosity for the enhanced methanol to aromatics reaction

Y. Wang, T. Li, Y. Ouyang, J. Zhong, Y. Zhang, X. Xiong, Q. Hu, J. Deng, H. Sun and Z. Yan, Catal. Sci. Technol., 2024, 14, 2461 DOI: 10.1039/D3CY01783D

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