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

Beaumont, Simon K.; Alayoglu, Selim; Specht, Colin; Kruse, Norbert; Somorjai, Gabor A.

doi:10.1021/nl501969k

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

Beaumont, Simon K.; Alayoglu, Selim; Specht, Colin; Kruse, Norbert; Somorjai, Gabor A.

Authors

Dr Simon Beaumont simon.beaumont@durham.ac.uk
Associate Professor

Selim Alayoglu

Colin Specht

Norbert Kruse

Gabor A. Somorjai

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.

Citation

Beaumont, S. K., Alayoglu, S., Specht, C., Kruse, N., & Somorjai, G. 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. https://doi.org/10.1021/nl501969k

Journal Article Type	Article
Acceptance Date	Jul 6, 2014
Online Publication Date	Jul 15, 2014
Publication Date	Aug 13, 2014
Deposit Date	Jul 18, 2014
Publicly Available Date	Jul 21, 2014
Journal	Nano Letters
Print ISSN	1530-6984
Electronic ISSN	1530-6992
Publisher	American Chemical Society
Peer Reviewed	Peer Reviewed
Volume	14
Issue	8
Pages	4792-4796
DOI	https://doi.org/10.1021/nl501969k
Keywords	Hydrogen spillover, Nanoparticles, Catalysis, Surface diffusion, Transport limited, CO2 methanation.

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/nl501969k.