Journal
TOPICS IN CATALYSIS
Volume 54, Issue 13-15, Pages 778-785Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-011-9695-9
Keywords
Cobalt nanoparticles; Silica support; NEXAFS; AP-XPS; Catalysis
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Funding
- Office of Energy Research, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Center for Electron Microscopy, Lawrence Berkeley Lab
- U.S. Department of Energy [DE-AC02-05CH11231]
- Office of Science, Office of Basic Energy Sciences, Division of Material Sciencess and Engineering, of the U. S. Department of Energy [DE-AC02-05CH11231]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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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 H-2 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.
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