Investigating the acid site distribution of a new-generation methyl chloride synthesis catalyst

McInroy, A. R., Winfield, J. M., Dudman, C. C., Jones, P. and Lennon, D. (2019) Investigating the acid site distribution of a new-generation methyl chloride synthesis catalyst. ACS Omega, 4(9), pp. 13981-13990. (doi: 10.1021/acsomega.9b01719) (PMID:31497716) (PMCID:PMC6714609)

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Abstract

The effect of modifying an η-alumina methyl chloride synthesis catalyst by doping with CsCl and KCl over the concentration range of 0.1–1.0 mmol g(cat)–1 is investigated by a combination of pyridine chemisorption coupled with infrared spectroscopy and mass-selective temperature-programmed desorption measurements. The loading of group 1 metal chloride is equivalent to a titrant that enables selective neutralization of Lewis acid sites present at the surface of the reference η-alumina catalyst. Specifically, a loading of 0.1 mmol g(cat)–1 is sufficient to neutralize the strong Lewis acid sites; a loading of 0.6 mmol g(cat)–1 is sufficient to neutralize the strong and medium-strong Lewis acid sites; a loading of 1.0 mmol g(cat)–1 neutralizes all of the strong and medium-strong Lewis acid sites and partially neutralizes the medium-weak Lewis acid site. These deductions connect with a catalyst design program to develop a methyl chloride synthesis catalyst that exhibits minimal formation of the byproduct dimethyl ether.

Item Type:Articles
Additional Information:The EPSRC (grant number GR/P01984/01) and Ineos Chlor are thanked for project support and the provision of an Industrial CASE award (ARM).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Winfield, Professor John and Lennon, Professor David
Authors: McInroy, A. R., Winfield, J. M., Dudman, C. C., Jones, P., and Lennon, D.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:ACS Omega
Publisher:American Chemical Society
ISSN:2470-1343
ISSN (Online):2470-1343
Published Online:12 August 2019
Copyright Holders:Copyright © 2019 American Chemical Society
First Published:First published in ACS Omega 4(9): 13981-13990
Publisher Policy:Reproduced under a Creative Commons License

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