Operando Raman spectroscopy is a powerful tool to shine light on solid catalysts. Unfortunately, intense background fluorescence often obscures Raman spectra to the extent that they become uninterpretable. In this work, we use time-gated Raman spectroscopy to improve the spectral quality by the suppression of fluorescence background based on its relatively slow dynamics compared to Raman scattering. The technique is based on an innovative detector design and has been used to study the formation of carbon deposits and subsequent catalyst deactivation during propane dehydrogenation over Pt-Sn-based catalysts. Furthermore, we show the general benefits of time-gating for operando Raman spectroscopy.
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