Microwaves effectively examine the extent and type of coking over acid zeolite catalysts

Liu, B., Slocombe, D. R. ORCID: https://orcid.org/0000-0003-3590-6075, Wang, J., Aldawsari, A., Gonzalez-Cortes, S., Arden, J., Kuznetsov, V. L., AlMegren, H., AlKinany, M., Xiao, T. and Edwards, P. P. 2017. Microwaves effectively examine the extent and type of coking over acid zeolite catalysts. Nature Communications 8 , 514. 10.1038/s41467-017-00602-8

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Abstract

Coking leads to the deactivation of solid acid catalyst. This phenomenon is a ubiquitous problem in the modern petrochemical and energy transformation industries. Here, we show a method based on microwave cavity perturbation analysis for an effective examination of both the amount and the chemical composition of cokes formed over acid zeolite catalysts. The employed microwave cavity can rapidly and non-intrusively measure the catalytically coked zeolites with sample full body penetration. The overall coke amount is reflected by the obtained dielectric loss (ε″) value, where different coke compositions lead to dramatically different absorption efficiencies (ε″/cokes’ wt%). The deeper-dehydrogenated coke compounds (e.g., polyaromatics) lead to an apparently higher ε″/wt% value thus can be effectively separated from lightly coked compounds. The measurement is based on the nature of coke formation during catalytic reactions, from saturated status (e.g., aliphatic) to graphitized status (e.g., polyaromatics), with more delocalized electrons obtained for enhanced Maxwell–Wagner polarization.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	This article is licensed under a Creative Commons Attribution 4.0 International License.
Publisher:	Nature Research
ISSN:	2041-1723
Date of First Compliant Deposit:	11 September 2017
Date of Acceptance:	12 July 2017
Last Modified:	04 May 2023 22:59
URI:	https://orca.cardiff.ac.uk/id/eprint/104521

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