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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

par Beaumont, Simon K.;Alayoglu, Selim;Specht, Colin;Somorjai, Gabor A.;Kruse, Norbert
Référence Nano letters, 14, 8, page (4792-4796)
Publication Publié, 2014-08

Article révisé par les pairs

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Résumé :

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. © 2014 American Chemical Society.