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Issue 22, 2016
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Oxygen-containing coke species in zeolite-catalyzed conversion of methanol to hydrocarbons

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Abstract

Zeolites are the most commonly used catalysts for methanol-to-hydrocarbon (MTH) conversion. Here, we identified two oxygen-containing compounds as coke species in zeolite catalysts after MTH reactions. We investigated the possible influences of the oxygen-containing compounds on coke formation, catalyst deactivation, product selectivity, and the induction period of the MTH reaction through a series of controlled experiments in which one of the identified compounds (2,3-dimethyl-2-cyclopenten-1-one) was co-fed with methanol over a zeolite H-ZSM-5 catalyst. Our results allow us to infer that once produced, the oxygen-containing compounds block the Brønsted acid sites by strong chemisorption and their rapid conversion to aromatics expedites the formation of coke and thus the deactivation of the catalyst. A minor effect of the production of such compounds during the MTH reaction is that the aromatic-based catalytic cycle can be slightly promoted to give higher selectivity to ethylene.

Graphical abstract: Oxygen-containing coke species in zeolite-catalyzed conversion of methanol to hydrocarbons

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Publication details

The article was received on 08 Jul 2016, accepted on 06 Oct 2016 and first published on 06 Oct 2016


Article type: Paper
DOI: 10.1039/C6CY01463A
Citation: Catal. Sci. Technol., 2016,6, 8157-8165
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    Oxygen-containing coke species in zeolite-catalyzed conversion of methanol to hydrocarbons

    Z. Liu, X. Dong, X. Liu and Y. Han, Catal. Sci. Technol., 2016, 6, 8157
    DOI: 10.1039/C6CY01463A

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