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Active sites of atomically dispersed Pt supported on Gd-doped ceria with improved low temperature performance for CO oxidation
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- Li, Yuanyuan (författare)
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook NY 11794 USA; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge TN 37831 USA
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- Wang, Haodong (författare)
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook NY 11794 USA
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- Song, Haohong (författare)
- Interdisciplinary Materials Science, Vanderbilt University, Nashville TN 37235 USA
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- Royal Society of Chemistry (RSC), 2023
- 2023
- Engelska.
- Ingår i: Chemical Science. - : Royal Society of Chemistry (RSC). - 2041-6520 .- 2041-6539. ; 14:44, s. 12582-12588
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- “Single-atom” catalysts (SACs) have been the focus of intense research, due to debates about their reactivity and challenges toward determining and designing “single-atom” (SA) sites. To address the challenge, in this work, we designed Pt SACs supported on Gd-doped ceria (Pt/CGO), which showed improved activity for CO oxidation compared to its counterpart, Pt/ceria. The enhanced activity of Pt/CGO was associated with a new Pt SA site which appeared only in the Pt/CGO catalyst under CO pretreatment at elevated temperatures. Combined X-ray and optical spectroscopies revealed that, at this site, Pt was found to be d-electron rich and bridged with Gd-induced defects via an oxygen vacancy. As explained by density functional theory calculations, this site opened a new path via a dicarbonyl intermediate for CO oxidation with a greatly reduced energy barrier. These results provide guidance for rationally improving the catalytic properties of SA sites for oxidation reactions.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- Li, Yuanyuan
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