Pt/MgO catalysts with low Pt loadings (0.1 wt%) were prepared from aqueous/alcohol solvents and treated at various temperatures to tune the degree of surface hydroxylation, and structures were characterized with HERFD-XANES and EXAFS spectra recorded at the Pt LIII edge. The XANES data demonstrate the cationic nature of the platinum, and EXAFS and STEM data demonstrate its atomic dispersion, with isolated atoms on top of Mg columns in the (110) projection. The support in Pt supported on MgO calcined at 700 °C coordinates through more Pt–O bonds than that in supported on MgO calcined at 400 °C. The data are the basis of a model consisting of surface-coordinated Pt sites. The catalyst is active and stable for high-temperature CO oxidation, with kinetics and light-off curves characterizing its performance, and for low-temperature ethylene hydrogenation. We present structural models based on DFT and the experimental results.

MgO-supported single-site platinum catalysts for CO oxidation and ethylene hydrogenation: Characterization with X-ray absorption spectroscopy, electron microscopy, and density functional theory

ACS Fall 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.