Reversible activity upon redox cycling at high temperature has been demonstrated on Pt catalyst that supported on high-surface-area LaFeO3 thin films coated on MgAl2O4 using atomic layer deposition (ALD). This catalyst exhibited similar behaviors as the so called “intelligent” catalysts, showing superior activity in CO oxidation after high-temperature reduction. The Pt remained dispersed as ~1 nm particles after oxidation at 1073 K, showing epitaxial registration with the LaFeO3 lattice underneath. ex situ extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) measurements on the oxidized sample showed that Pt content was in a mixture of Pt and PtO2, while Pt in the reduced sample was in the metallic form. Despite the high Pt dispersion, CO adsorption at room temperature was negligible. Possible reasons for how LaFeO3 affects properties of Pt are discussed.

“Self-regenerated” Pt catalysts supported on LaFeO3 films prepared by atomic layer deposition

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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