Diffuse reflectance FT-IR analysis on metallic catalysts: baseline artifacts and correction of gas-phase species signal

National @ ING+APN:IJB:DBI:FRMInternational audienceDiffuse reflectance FT-IR spectroscopy (DRIFTS) is commonly used to investigate catalytic reactions. CO is a reagent of many reactions of interest for environmental catalysis and fuel and chemical synthesis, as well as being a surface probe to investigate the structure and oxidation state of metal-based particles by in situ and operando FT-IR spectroscopy.It is crucial to avoid IR signal distortion that may affect the IR spectrum in the region corresponding to adsorbed CO, which spans from ca. 2250 cm-1 down to 1600 cm-1. Such bands can appear in the DRIFTS spectra of silica-based solids when the temperature and/or the hydration level of the sample are modified. These bands are merely due to variations of the vibrations modes of the silica and are not related to adsorbed CO.Accurate correction of gas-phase CO signal during DRIFTS analyses can be obtained by collecting a subtrahend spectrum under identical reaction conditions over an inert material such as SiC. Spurious bands may otherwise arise if a subtrahend is collected at a different temperature

Spectrum baseline artefacts and correction of gas-phase species signal during diffuse reflectance FT-IR analyses of catalysts at variable temperatures

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Individual Heat of Adsorption of Adsorbed CO Species on Palladium and Pd-Sn Nanoparticles Supported on Al2O3 by Using Temperature-Programmed Adsorption Equilibrium Methods

SSCI-VIDE+CARE:ING+IJB:JCO:FRM:DBIInternational audienc

Heat of adsorption of CO on EUROPT-1 using the AEIR method: Effect of analysis parameters, water and sample mode

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