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Selective production of para-xylene and light olefins from methanol over mesostructured Zn-Mg-P/ZSM-5 catalyst

Abstract

The mesostructured Zn-Mg-P/ZSM-5 catalyst has been fabricated for direct conversion of methanol to p-xylene and light olefins (C2= ~ C4=). The Zn-modified ZSM-5 zeolites afford the main activity for methanol aromatization. The subsequent Mg-P co-modification improves the shape-selectivity towards p-xylene and promotes the production of light olefins, by partially blocking the pore-openings and strongly passivating the acidity. Inevitably, the catalyst activity is diminished during the modification process. To enhance the mass transfer and increase the overall reactivity, additional mesoporosity has been incorporated into the catalyst by desilication. The combination of mesoporous zeolite structure and Zn-Mg-P modification endows the catalyst with an efficient and stable catalytic performance, yielding ca. 19 wt% p-xylene (>90 wt% para-selectivity) and ca. 46 wt% light olefins with a nearly complete methanol conversion in 50 h reaction. This work also provides a strategy for compensating the reduced activity and deteriorated stability of the modified catalysts in shape-selective reactions.

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Publication details

The article was received on 23 Oct 2018, accepted on 01 Dec 2018 and first published on 04 Dec 2018


Article type: Paper
DOI: 10.1039/C8CY02189A
Citation: Catal. Sci. Technol., 2019, Accepted Manuscript
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    Selective production of para-xylene and light olefins from methanol over mesostructured Zn-Mg-P/ZSM-5 catalyst

    J. Zhang, X. Zhu, S. Zhang, M. Cheng, M. Yu, G. Wang and C. Li, Catal. Sci. Technol., 2019, Accepted Manuscript , DOI: 10.1039/C8CY02189A

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