We report an in-situ/operando characterization study of MgAl2O4 supported Ir single atoms to understand their unique electronic properties and reaction kinetics during low temperature CO oxidations. In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and in-situ/operando high energy resolution fluorescence detected X-ray absorption near edge structure (HERFD-XANES) spectroscopy were used to study the adsorption behaviors of CO and O2 at room temperature and during CO oxidation. Using DRIFTS, HERFD-XANES and FEFF calculated XANES spectra, we identified the structure and adsorption of CO and O2 on Ir single atoms. We demonstrate that CO and O are co-adsorbed on Ir single atoms during CO oxidation. We will discuss the possible reaction pathways of low temperature CO oxidation on Ir single atoms and the consequences of the CO-O co-adsorbed species on the reaction pathways.

In-situ/operando characterization of supported Ir single atoms

255th National Meeting (2018)

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