| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 65848 | Journal of Molecular Catalysis A: Chemical | 2013 | 8 Pages |
•In situ DRIFT targets CO adsorption on the standard Pt reference catalyst EuroPt-1.•The 55-atom Pt cuboctahedra exhibit three different sites: faces, edges and corners.•The method to analyze the complex spectrum of CO adsorbed on Pt is detailed.•IR frequencies come: face, edge, corner, and multiple adsorptions on a single corner.•Three parameters are studied: CO partial pressure, temperature and time.
A study using in situ Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy has targeted carbon monoxide (CO) adsorption on the standard platinum (Pt) reference catalyst EuroPt-1. Reduced and non-reduced EuroPt-1 were analyzed in an infrared (IR) chamber which allowed the control of the CO atmosphere from temperatures ranging from −30 to 300 °C. The complex spectra of CO linearly adsorbed on highly dispersed Pt have been analyzed by using a combination of Fourier self-deconvolution and curve fitting. The linear-CO spectrum is composed of three main bands at 2096, 2083 and 2072 cm−1. These were attributed to the three different adsorption sites – faces, edges and corners – of the 55-atom cuboctahedron Pt particles. The adsorption site competition was followed as a function of the temperature and it was demonstrated that these sites were never completely covered with CO. Furthermore, non-reduced EuroPt-1 presented reversible oxygen binding at low temperature in competition with CO. At 300 °C, CO mainly occupied corner sites and a comparable state was approached for both catalysts by the removal of the oxygen from these corner sites.
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