Preprint Article Version 1 This version is not peer-reviewed

A Facile Strategy to Prepare Shaped ZSM-5 Catalyst with Enhanced para-Xylene Selectivity and Stability for Toluene Methylation

Version 1 : Received: 1 April 2017 / Approved: 3 April 2017 / Online: 3 April 2017 (17:27:20 CEST)

How to cite: Wang, Y.; Chang, Y.; Liu, M.; Zhang, A.; Song, C.; Guo, X. A Facile Strategy to Prepare Shaped ZSM-5 Catalyst with Enhanced para-Xylene Selectivity and Stability for Toluene Methylation. Preprints 2017, 2017040009 (doi: 10.20944/preprints201704.0009.v1). Wang, Y.; Chang, Y.; Liu, M.; Zhang, A.; Song, C.; Guo, X. A Facile Strategy to Prepare Shaped ZSM-5 Catalyst with Enhanced para-Xylene Selectivity and Stability for Toluene Methylation. Preprints 2017, 2017040009 (doi: 10.20944/preprints201704.0009.v1).

Abstract

This work describes the catalytic performances of attapulgite/ZSM-5 extrudate in comparison to conventional alumina-bound ZSM-5 extrudate in toluene methylation. The novel attapulgite/ZSM-5 extrudate is prepared by using natural clay attapulgite as binder which introduces mobile alkaline species and macropores to the extrudate. In contrast to alumina-bound extrudate, this novel extrudate shows significantly higher para-selectivity and stability. By using characterization techniques, including in-situ XRD, SEM, NH3 temperature programmed desorption (TPD), thermogravimetric analysis and n-hexane/cyclohexane physical adsorption, the catalytic performance improvement of attapulgite/ZSM-5 extrudate is correlated with the neutralization of Brønsted acid sites by mobile alkaline species during calcination and reaction process. Moreover, a higher para-selectivity was obtained over attapulgite-bound modified ZSM-5 extrudate. The strategy of extruding ZSM-5 catalysts with attapulgite as binder is facile and universal. Such method paves a new way for preparation of shaped toluene methylation catalyst with enhanced para-selectivity and stability.

Subject Areas

toluene methylation; zeolite extrudates; para-xylene selectivity; attapulgite; binder; stability

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