Abstract
ABSTRACT LaFeO3 films were deposited to a thickness of 0.5 nm onto amorphous SiO2 by Atomic Layer Deposition and used as supports for Pt. Uniform coverage of the SiO2 was demonstrated by Scanning Transmission Electron Microscopy (STEM) and Temperature Programmed Desorption (TPD) of 2-propanol. The films were found to be amorphous to X-Ray Diffraction, but the reducibility of the Fe in the films and the ability of the films to maintain high Pt dispersions following harsh redox treatments suggested that the perovskite phase was formed on a short length scale. Similar to results found on Pt/LaFeO3/MgAl2O4, Pt/LaFeO3/SiO2 catalysts maintained a high Pt dispersion following redox cycling at 1073 K and showed high activity for CO oxidation following high-temperature reduction. The implications for using these materials is discussed.
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