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Combining in situ NEXAFS spectroscopy and CO₂ methanation kinetics to study Pt and Co nanoparticle catalysts reveals key insights into the role of platinum in promoted cobalt catalysis

Beaumont, Simon K.; Alayoglu, Selim; Specht, Colin; Michalak, William D.; Pushkarev, Vladimir V.; Guo, Jinghua; Kruse, Norbert; Somorjai, Gabor A.

Combining in situ NEXAFS spectroscopy and CO₂ methanation kinetics to study Pt and Co nanoparticle catalysts reveals key insights into the role of platinum in promoted cobalt catalysis Thumbnail


Authors

Selim Alayoglu

Colin Specht

William D. Michalak

Vladimir V. Pushkarev

Jinghua Guo

Norbert Kruse

Gabor A. Somorjai



Abstract

The mechanistic role of platinum and precious metals in promoting cobalt hydrogenation catalysts of the type used in reactions such as Fischer–Tropsch synthesis is highly debated. Here we use well-defined monometallic Pt and Co nanoparticles (NPs) and CO2 methanation as a probe reaction to show that Pt NPs deposited near Co NPs can enhance the CO2 methanation rate by up to a factor of 6 per Co surface atom. In situ NEXAFS spectroscopy of these same Pt NP plus Co NP systems in hydrogen shows that the presence of nearby Pt NPs is able to significantly enhance reduction of the Co at temperatures relevant to Fischer–Tropsch synthesis and CO2 methanation. The mechanistic role of Pt in these reactions is discussed in light of these findings.

Citation

Beaumont, S. K., Alayoglu, S., Specht, C., Michalak, W. D., Pushkarev, V. V., Guo, J., …Somorjai, G. A. (2014). Combining in situ NEXAFS spectroscopy and CO₂ methanation kinetics to study Pt and Co nanoparticle catalysts reveals key insights into the role of platinum in promoted cobalt catalysis. Journal of the American Chemical Society, 136(28), 9898-9901. https://doi.org/10.1021/ja505286j

Journal Article Type Article
Acceptance Date May 27, 2014
Online Publication Date Jul 7, 2014
Publication Date Jul 16, 2014
Deposit Date Jul 17, 2014
Publicly Available Date Mar 28, 2024
Journal Journal of the American Chemical Society
Print ISSN 0002-7863
Electronic ISSN 1520-5126
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 136
Issue 28
Pages 9898-9901
DOI https://doi.org/10.1021/ja505286j

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, 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/ja505286j.




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