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CO₂ Hydrogenation Studies on Co and CoPt Bimetallic Nanoparticles Under Reaction Conditions Using TEM, XPS and NEXAFS

Alayoglu, Selim; Beaumont, Simon K.; Zheng, Fan; Pushkarev, Vladimir V.; Zheng, Haimei; Iablokov, Viacheslav; Liu, Zhi; Guo, Jinghua; Kruse, Norbert; Somorjai, Gabor A.

CO₂ Hydrogenation Studies on Co and CoPt Bimetallic Nanoparticles Under Reaction Conditions Using TEM, XPS and NEXAFS Thumbnail


Authors

Selim Alayoglu

Fan Zheng

Vladimir V. Pushkarev

Haimei Zheng

Viacheslav Iablokov

Zhi Liu

Jinghua Guo

Norbert Kruse

Gabor A. Somorjai



Abstract

Cobalt and platinum–cobalt bimetallic alloy nanoparticles of uniform size distribution where prepared and supported on MCF-17 to produce a controlled and well-characterized model catalyst which was studied under reaction conditions during CO2 hydrogenation. Near edge X-ray absorption fine structure (NEXAFS) spectroscopy was used to elucidate the oxidation state of the catalyst under reaction conditions while the effect of reducing H2 gas on the composition and structure of the bimetallic PtCo nanoparticles was measured using ambient pressure X-ray photoelectron spectroscopy (AP-XPS) and environmental transmission electron microscopy (ETEM). NEXAFS indicates that Pt aids the reduction of Co to its metallic state under relevant reaction conditions, while AP-XPS and ETEM indicate that Pt is enriched at the surface by exchange with subsurface layers which become Pt deficient—in agreement with the “Pt-like” selectivity seen during catalytic testing of these materials.

Citation

Alayoglu, S., Beaumont, S. K., Zheng, F., Pushkarev, V. V., Zheng, H., Iablokov, V., …Somorjai, G. A. (2011). CO₂ Hydrogenation Studies on Co and CoPt Bimetallic Nanoparticles Under Reaction Conditions Using TEM, XPS and NEXAFS. Topics in Catalysis, 54(13-15), 778-785. https://doi.org/10.1007/s11244-011-9695-9

Journal Article Type Article
Publication Date Sep 1, 2011
Deposit Date Mar 8, 2014
Publicly Available Date Apr 15, 2014
Journal Topics in Catalysis
Print ISSN 1022-5528
Electronic ISSN 1572-9028
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 54
Issue 13-15
Pages 778-785
DOI https://doi.org/10.1007/s11244-011-9695-9
Keywords Cobalt nanoparticles, Silica support, NEXAFS, AP-XPS, Catalysis.

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