Issue 22, 2023

Operando time-gated Raman spectroscopy of solid catalysts

Abstract

Operando Raman spectroscopy is a powerful analytical tool to provide new insights in the working and deactivation principles of solid catalysts. Intense fluorescence can obscure Raman spectra to the extent that they become uninterpretable. Time-gated Raman spectroscopy, based on pulsed excitation and time-gated detection, suppresses background fluorescence based on its slower time dynamics compared to Raman scattering. In this work, we demonstrate and quantify the benefit of time gating for operando Raman spectroscopy, using the propane dehydrogenation reaction over Pt–Sn-based catalyst materials as a case study. Experimental time-gated Raman spectroscopy data are fitted to a time-trace model that is used to optimize time gating for the maximum signal-to-background-noise ratio. Time-gated Raman spectra of a spent propane dehydrogenation catalyst material show lower background fluorescence compared to the time-integrated Raman spectra counterparts. Simultaneous operando time-gated and time-integrated Raman spectroscopy experiments demonstrate the benefit of time gating to obtain more distinct Raman features, especially in the early coking stages where spectra are dominated by background fluorescence.

Graphical abstract: Operando time-gated Raman spectroscopy of solid catalysts

Supplementary files

Article information

Article type
Paper
Submitted
11 Jul 2023
Accepted
06 Sep 2023
First published
07 Sep 2023
This article is Open Access
Creative Commons BY license

Catal. Sci. Technol., 2023,13, 6366-6376

Operando time-gated Raman spectroscopy of solid catalysts

R. Vogel, P. T. Prins, F. T. Rabouw and B. M. Weckhuysen, Catal. Sci. Technol., 2023, 13, 6366 DOI: 10.1039/D3CY00967J

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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