Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 120, Issue 49, Pages 28057-28066Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b09824
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Funding
- Russian Foundation for Basic Research (RFBR) [15-02-06090]
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Depending on platinum loading and gas environment vastly different platinum structures in Pt/ceria were observed by Pt L-3-edge extended X-ray absorption (EXAFS) and X-ray absorption near-edge (XANES) spectroscopies. Calcination of highly loaded platinum (4 wt %) yielded stacked layers of alpha-PtO2. The low platinum-loaded sample (2 wt %), obtained by leaching, consisted of a single layer of alpha-PtPO2 bonded to the support by Pt-O-Ce linkages. Reduction of the platinum oxide by exposure to a carbon monoxide and hydrogen (PROX) gas mixture led to complete metal reduction at temperatures above 540 K. Under these conditions platinum-cerium bonds with a distance of 2.4 angstrom were detected and particles of 0.8 and 0.6 nm for the high-loaded and low-loaded Pt/ceria samples, respectively.
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