Issue 41, 2019, Issue in Progress

Controlling the product selectivity in the conversion of methanol to the feedstock for phenol production

Abstract

This work investigated a novel nonpetroleum-based catalytic process of methanol to phenol. The idea was to convert methanol to produce a main product stream having a molar ratio of propylene to benzene/toluene of unity along with relatively higher-value products including para-xylene and alkenes. Such a product mix would be ideal for the manufacturing of phenol. This was achieved using a catalyst of 1.5 wt% zinc impregnated on a silica-deposited HZSM-5 zeolite at 0.1 MPa, 430 °C and 1.2 h−1 weight hourly space velocity. HZSM-5, with its acidic sites predominately being Brønsted acid, produced mainly alkanes and aromatics, of which a good fraction was undesirable nine- or more-nine-carbon higher aromatics. Silica deposition on HZSM-5 passivated the catalytic activity outside the HZSM-5 pores, resulting in an increase of alkenes selectivity, a sharp decrease of nine- or more-nine-carbon higher aromatics selectivity, and a shift of the xylene product from an equilibrium mixture of meta-xylene, para-xylene, and ortho-xylene to mostly para-xylene. Impregnation of 1.5 wt% zinc on silica-deposited HZSM-5 generated more Lewis acid sites and further increased alkene selectivity, which, with the proper selection of process conditions, led to the production of the target stream. A detailed analysis of the effects of silica deposition, zinc impregnation, acidic sites, and process conditions on the catalyst performance was presented.

Graphical abstract: Controlling the product selectivity in the conversion of methanol to the feedstock for phenol production

Supplementary files

Article information

Article type
Paper
Submitted
17 May 2019
Accepted
16 Jul 2019
First published
01 Aug 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 23864-23875

Controlling the product selectivity in the conversion of methanol to the feedstock for phenol production

A. S. Zambare, J. Ou, D. S. Hill Wong, C. Yao and S. Jang, RSC Adv., 2019, 9, 23864 DOI: 10.1039/C9RA03723C

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