Selim Alayoglu
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.
Authors
Dr Simon Beaumont simon.beaumont@durham.ac.uk
Associate Professor
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. |
Public URL | https://durham-repository.worktribe.com/output/1437364 |
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Copyright Statement
The final publication is available at Springer via http://dx.doi.org/10.1007/s11244-011-9695-9.
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