Methanol-to-olefins studied by UV Raman spectroscopy as compared to visible wavelength: capitalization on resonance enhancement

Campbell, Emma, Sazanovich, Igor V., Towrie, Michael, Watson, Michael J., Lezcano-Gonzalez, Ines and Beale, Andrew M. 2024. Methanol-to-olefins studied by UV Raman spectroscopy as compared to visible wavelength: capitalization on resonance enhancement. Journal of Physical Chemistry Letters 15 (26) , pp. 6826-6834. 10.1021/acs.jpclett.4c00865

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Abstract

Resonance Raman spectroscopy can provide insights into complex reaction mechanisms by selectively enhancing the signals of specific molecular species. In this work, we demonstrate that, by changing the excitation wavelength, Raman bands of different intermediates in the methanol-to-hydrocarbons reactions can be identified. We show in particular how UV excitation enhances signals from short-chain olefins and cyclopentadienyl cations during the induction period, while visible excitation better detects later-stage aromatics. However, visible excitation is prone to fluorescence that can obscure Raman signals, and hence, we show how fast fluorescence rejection techniques like Kerr gating are necessary for extracting useful information from visible excitation measurements.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Additional Information:	License information from Publisher: LICENSE 1: URL: https://creativecommons.org/licenses/by/4.0/, Start Date: 2024-06-25
Publisher:	American Chemical Society
ISSN:	1948-7185
Date of First Compliant Deposit:	9 July 2024
Date of Acceptance:	29 May 2024
Last Modified:	09 Jul 2024 09:00
URI:	https://orca.cardiff.ac.uk/id/eprint/170434

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