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Issue 42, 2016
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An operando emission spectroscopy study of Pt/Al2O3 and Pt/CeO2/Al2O3

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Abstract

In situ time-resolved spectroscopic examination of catalysts based on well dispersed nanoparticles on metal oxides under transient conditions significantly facilitates the elucidation of reaction mechanisms. In this contribution, we demonstrate the level of structural information that can be obtained using high-energy resolution off-resonant spectroscopy (HEROS) to study 1.3 wt% Pt/Al2O3 and 1.3 wt% Pt/20 wt% CeO2/Al2O3 catalysts subjected to redox pulsing. First, HEROS is compared with XANES in a temperature programmed reduction experiment to demonstrate the increased sensitivity and time resolution of HEROS. Second, modulation excitation spectroscopy is exploited by redox pulsing to enhance the sensitivity of HEROS to structural changes by the application of phase sensitive detection (PSD) to the time-resolved HEROS data set. The HEROS measurements were complemented by resonant X-ray emission (RXES) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy measurements performed under identical conditions and in a single reactor cell in order to probe different aspects of the catalyst materials under the selected experimental conditions.

Graphical abstract: An operando emission spectroscopy study of Pt/Al2O3 and Pt/CeO2/Al2O3

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Publication details

The article was received on 30 Aug 2016, accepted on 22 Sep 2016 and first published on 28 Sep 2016


Article type: Paper
DOI: 10.1039/C6CP05992A
Citation: Phys. Chem. Chem. Phys., 2016,18, 29268-29277
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    An operando emission spectroscopy study of Pt/Al2O3 and Pt/CeO2/Al2O3

    V. Marchionni, J. Szlachetko, M. Nachtegaal, A. Kambolis, O. Kröcher and D. Ferri, Phys. Chem. Chem. Phys., 2016, 18, 29268
    DOI: 10.1039/C6CP05992A

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