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Durham University

Research & business

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Publication details for Dr Simon Beaumont

Beaumont, Simon K., Alayoglu, Selim, Specht, Colin, Kruse, Norbert & Somorjai, Gabor A. (2014). 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. Nano Letters 14(8): 4792-4796.

Author(s) from Durham

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.