Unconventional coke composition during high temperature anisole disproportionation on zeolites

Unconventional coke composition during high temperature anisole disproportionation on zeolites

Catalyst deactivation and shape selectivity in evolved products and retained coke are studied on medium, large and extra-large pore zeolites with varying Si/Al ratios in the disproportionation of anisole. Deactivation modelling as a function of time on stream highlights the key role of the catalyst...

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Bibliographic Details
Published in:Applied catalysis. A, General Vol. 682; p. 119808
Main Authors: Pichot, N., Chaouati, N., Lemaitre, T., Fahda, M., Valtchev, V., Mintova, S., Gilson, J.-P., Dufour, A., Pinard, L.
Format: Journal Article
Language:English
Published: Elsevier B.V 25-07-2024
Elsevier
Subjects:
Anisole
Catalysis
Chemical Sciences
Coke
Organic chemistry
Phenolic compounds
Zeolite
Zeolite pore size
Zeolite pore size
Zeolite
Phenolic compounds
Anisole
Coke
coke
phenolic compounds
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Summary:Catalyst deactivation and shape selectivity in evolved products and retained coke are studied on medium, large and extra-large pore zeolites with varying Si/Al ratios in the disproportionation of anisole. Deactivation modelling as a function of time on stream highlights the key role of the catalyst pore volume. Changes in selectivity between the primary (methylanisole) and secondary (cresol) products are due to the overtaking of one path over a second for the production of cresol. The nature of the products (methyl phenols) inhibits the formation of “usual” polyaromatic and non-oxygenated coke via the Sullivan mechanism, leaving only adsorbed oxygenated monoaromatics, available for transalkylation reactions with the feed, having adsorbed and fouled most of the available surface in the catalyst channels. [Display omitted] •Pore shape and size has not impact on coke nature for anisole disproportionation.•MOR, FAU, *BEA and JZO zeolites yield to the same oxygenated coke molecules: methyl-phenolics.•Phenolic function blocks the ring contraction/expansion mechanism responsible for coke growth.•Deactivation is by fouling and depends mainly on the pore volume and channel interconnectivity.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2024.119808