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Methanol Desorption from Cu-ZSM-5 Studied by In Situ Infrared Spectroscopy and First-Principles Calculations
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0001-6748-6656
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Number of Authors: 112017 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 121, no 49, p. 27389-27398Article in journal (Refereed) Published
Abstract [en]

The dynamic interaction of methanol and its derivatives with Cu-exchanged ZSM-5 during methanol temperature -programmed desorption from 30 to 450 degrees C has been investigated using in situ diffuse reflectance infrared Fourier transform spectroscopy and first-principles calculations. The results emphasize that defects in the framework structure of the zeolite and Bronsted acid sites constitute ion-exchange sites for Cu ions. The Cu sites introduced in ZSM-S actively interact with methanol adsorbed at moderate temperature, i.e., below 250 degrees C, and take roles in further oxidation of the adsorbed species to formate and CO. Moreover, spectra recorded at higher temperatures, i.e., above 300 degrees C, after adsorption of methanol show strong interaction between methoxy groups and the zeolite framework, suggesting that, under mild conditions, proton extraction for methanol production during direct partial methane to methanol over Cu-ZSM-5 is necessary.

Place, publisher, year, edition, pages
2017. Vol. 121, no 49, p. 27389-27398
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Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-150922DOI: 10.1021/acs.jpcc.7b07067ISI: 000418393900017OAI: oai:DiVA.org:su-150922DiVA, id: diva2:1172175
Available from: 2018-01-09 Created: 2018-01-09 Last updated: 2018-01-09Bibliographically approved

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Cichocka, Magdalena O.Zou, Xiaodong
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