title: Exceptional thermal stability of Pd@CeO2 core-shell catalyst nanostructures grafted onto an oxide surface.
abstract: Monolayer films of highly catalytically active Pd@CeO2 core-shell nanocomposites were grafted onto a planar YSZ(100) (yttria-stabilized zirconia, YSZ) single crystal support that was functionalized with a CVD-deposited layer of triethoxy(octyl)silane (TEOOS). The resulting monolayer films were found to exhibit exceptionally high thermal stability compared to bare Pd nanoparticles with the Pd@CeO2 nanostructures remaining intact and highly dispersed upon calcining in air at temperatures in excess of 1000 K. The CeO2 shells were also shown to be more easily reduced than bulk CeO2, which may partially explain their unique activity as oxidation catalysts. The use of both TEOOS and tetradecylphosphonic acid (TDPA) as coupling agents for dispersing Pd@CeO2 core-shell nanocomposites onto a high surface area γ-Al2O3 support is also demonstrated.
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 311A Towne Building, 220 S. 33rd Street, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Lawrence
authors.initials: L
authors.lastname: Adijanto
authors.forename: David A
authors.initials: DA
authors.lastname: Bennett
authors.forename: Chen
authors.initials: C
authors.lastname: Chen
authors.forename: Anthony S
authors.initials: AS
authors.lastname: Yu
authors.forename: Matteo
authors.initials: M
authors.lastname: Cargnello
authors.forename: Paolo
authors.initials: P
authors.lastname: Fornasiero
authors.forename: Raymond J
authors.initials: RJ
authors.lastname: Gorte
authors.forename: John M
authors.initials: JM
authors.lastname: Vohs