title: A nanoscale demonstration of hydrogen atom spillover and surface diffusion across silica using the kinetics of CO2 methanation catalyzed on spatially separate Pt and Co nanoparticles.
abstract: Hydrogen spillover is of great importance to understanding many phenomena in heterogeneous catalysis and has long been controversial. Here we exploit well-defined nanoparticles to demonstrate its occurrence through evaluation of CO2 methanation kinetics. Combining platinum and cobalt nanoparticles causes a substantial increase in reaction rate, but increasing the spatial separation between discrete cobalt and platinum entities results in a dramatic ∼ 50% drop in apparent activation energy, symptomatic of H atom surface diffusion limiting the reaction rate.
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Simon K
authors.initials: SK
authors.lastname: Beaumont
authors.forename: Selim
authors.initials: S
authors.lastname: Alayoglu
authors.forename: Colin
authors.initials: C
authors.lastname: Specht
authors.forename: Norbert
authors.initials: N
authors.lastname: Kruse
authors.forename: Gabor A
authors.initials: GA
authors.lastname: Somorjai