Perovskite-supported metal is sometimes referred to as an “Intelligent” catalyst because metal can reversibly leave or enter the perovskite lattice following high-temperature reduction or oxidation; however, slow egress-ingress kinetics associated with large perovskite crystallites make these systems impractical. In the present work, thin films (~1 nm) of ATiO3 (A=Ca, Sr and Ba) were deposited onto MgAl2O4 and then examined as catalyst supports for Ni, Pd and Pt. It was found that the metal supported on thin film perovskite has similar behavior as their bulk counterparts. For example, the Pt/ATiO3/MgAl2O4 catalyst exhibited evidence for strong support interactions. Pt/ATiO3/MgAl2O4 showed high activity for CO oxidation following reduction at 1073 K, even though CO adsorption was suppressed; but the catalysts were dramatically less active after oxidation at 1073 K and reduction at 773 K. Both Pt/ATiO3/MgAl2O4 and a catalyst formed by ex-solution of ATi0.95Pt0.05O3 exhibited very low rates for toluene hydrogenation in comparison to Pt/MgAl2O4. Supported Intelligent" Nickel catalysts showed enhanced coke resistance, similar to their bulk counterparts. The metal showed strong interactions with the thin film perovskite, as characterized by various techniques, including but not limited to STEM,LEIS and XAS. Impact on the metal's behavior from the A-site cations in the perovskite thin film will be discussed.

Ti-based perovskit intelligent" catalysts prepared by atomic layer deposition: Effect of A-site cations

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.