Issue 13, 2022

Design of highly stable metal/ZSM-5 catalysts for the shape-selective alkylation of toluene with methanol to para-xylene

Abstract

This work aims to achieve high para-selectivity while maintaining catalytic stability for the alkylation of toluene with methanol to para-xylene over ZSM-5 catalysts under demanding reaction conditions. A high para-selectivity of greater than 97% is achieved by applying consecutive SiO2–P2O5–MgO (SPM) and SiO2 surface coatings on the surface of pristine ZSM-5. This surface modification passivates the external acid sites and at the same time narrows the pore openings of the ZSM-5 particles, which are both beneficial for the high para-selectivity. The catalytic stability of the surface modified catalysts is achieved by loading with metals including Pt, Ni and (Pt + Ni). This study shows that catalysts co-loaded with (Pt + Ni) exhibit superior catalytic stability, not only in pure H2 but also in a carrier gas containing a very low H2 fraction of 5% H2 and 95% Ar. This is because the co-existence of Pt and Ni effectively inhibits the formation of low-carbon olefins (the coke precursors) via the dehydrogenation of methanol to carbon oxides and the hydrogenation of olefins to paraffins. By studying the different locations of metal loading on the catalysts, this work also confirms that the most effective location of metal loading is on the external surface of the modified catalysts.

Graphical abstract: Design of highly stable metal/ZSM-5 catalysts for the shape-selective alkylation of toluene with methanol to para-xylene

Supplementary files

Article information

Article type
Research Article
Submitted
31 mar. 2022
Accepted
20 maí 2022
First published
06 jún. 2022

Inorg. Chem. Front., 2022,9, 3348-3358

Design of highly stable metal/ZSM-5 catalysts for the shape-selective alkylation of toluene with methanol to para-xylene

H. Han, H. Yang, A. Zhang, L. Ren, X. Nie, C. Chen, M. Liu, C. Shi, C. Song and X. Guo, Inorg. Chem. Front., 2022, 9, 3348 DOI: 10.1039/D2QI00686C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements