Issue 7, 2024

Controlling the morphologies and crystal growth orientations of H-ZSM-5: their impact on the structure-diffusion-performance relationship in the methanol-to-propylene reaction

Abstract

In this study, three typical ZSM-5 catalysts with different morphologies and crystal growth orientations were prepared for methanol-to-propylene (MTP) reactions. Despite having similar acidity, significant differences in lifetimes and selectivity were observed over the three different ZSM-5 catalysts under a high space velocity of 10 h−1. Generally, the lifetime and propylene selectivity were in the order of ZSM-5-NS (300 h, 55.04%) > ZSM-5-NC (168 h, 53.34%) > ZSM-5-NF (78 h, 49.31%). A series of characterization results revealed that the superior performance of ZSM-NS was attributed to its higher ratio of framework Al distribution within the straight and sinusoidal channels favored for the alkene cycle and enhancing C2–4 olefin selectivity, a higher diffusion rate owing to its thinner (010) crystal plane along the b axis orientation, and higher crystallinity and fewer framework defects within the micropore contributed to an extended lifetime stability because of its lower coking rate. Additionally, the shaped ZSM-5-NS catalyst exhibited impressive stability and regenerability in a single-tube test, enduring an impressive long 2680 h lifespan in a single cycle and a total of 6800 h lifetime across three cycles, suggesting its significant potential for industrial application in the MTP process.

Graphical abstract: Controlling the morphologies and crystal growth orientations of H-ZSM-5: their impact on the structure-diffusion-performance relationship in the methanol-to-propylene reaction

Supplementary files

Article information

Article type
Paper
Submitted
09 Nov 2023
Accepted
18 Jan 2024
First published
25 Jan 2024

Catal. Sci. Technol., 2024,14, 1760-1774

Controlling the morphologies and crystal growth orientations of H-ZSM-5: their impact on the structure-diffusion-performance relationship in the methanol-to-propylene reaction

W. Zhang, X. Wang, Z. Wu, Z. Li, X. Yong, Y. Gu and J. Wang, Catal. Sci. Technol., 2024, 14, 1760 DOI: 10.1039/D3CY01558K

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