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Revealing Origin of Hydrogen-Carbonate Species in CO Oxidation Over Pt/Al2O3: A SSITKA-IR Study

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Abstract

The catalytic oxidation of CO by O2 to form CO2 over Pt based catalysis is one of the most studied catalytic reaction leading to controversial mechanism descriptions. Steady State Isotopic Transient Kinetic Analysis (SSITKA) coupled with InfraRed (IR) spectroscopy is a powerful technique to study heterogeneous reaction mechanisms combining both the observation of adsorbed species on the catalyst surface and kinetic measurements. In this paper, SSITKA-IR technique was applied to study the CO oxidation reaction in presence and absence of CO2 in order to distinguish between active and spectator intermediates formed during the reaction. Linear carbonyl and bridged carbonyl type species adsorbed on metallic Pt0 were clearly identified as active intermediates at low temperature (131 °C). In contrast, the hydrogen-carbonate species formed during CO oxidation reaction were proven to be inactive species in CO2 formation but rather due to the re-adsorption of CO2 product itself on alumina surface.

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Data Availabilty

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors thank the Region “Hauts-de-France” (Grant STaRS 2019), Centrale Lille Institute, the Ministère de l’Enseignement Supérieur et de la Recherche (CPER IRENE and CPER ECRIN) and the European Fund for Regional Economic Development for their financial support. ICP-OES analyses were performed in the « Spectrométrie par torche à plasma » platform of the Research Federation Michel-Eugène Chevreul hosted by the LASIRE laboratory.

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Authors and Affiliations

  1. Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181, UCCS - Unité de Catalyse et Chimie du Solide, Lille, 59000, France

    Ibrahim Hatoum, Nassim Bouchoul, Mélissandre Richard & Christophe Dujardin

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  1. Ibrahim Hatoum
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  2. Nassim Bouchoul
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  3. Mélissandre Richard
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Contributions

All authors contributed to the study conception and design. Material preparation and data collection were performed by IH and NB. All authors participated to the methodology development and data analysis. The first draft of the manuscript was written by IH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ibrahim Hatoum.

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Hatoum, I., Bouchoul, N., Richard, M. et al. Revealing Origin of Hydrogen-Carbonate Species in CO Oxidation Over Pt/Al2O3: A SSITKA-IR Study. Top Catal 66, 915–921 (2023). https://doi.org/10.1007/s11244-022-01722-2

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