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Reversible Atomizat...
Reversible Atomization and Nano-Clustering of Pt as a Strategy for Designing Ultra-Low-Metal-Loading Catalysts
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- Chakraborty, Debasish (författare)
- Technical University of Denmark
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- Smitshuysen, Thomas Erik Lyck (författare)
- Technical University of Denmark
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- Kakekhani, Arvin (författare)
- University of Pennsylvania
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- Jespersen, Sebastian Pirel Fredsgaard (författare)
- Haldor Topsøe A/S
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- Banerjee, Sayan (författare)
- University of Pennsylvania
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- Krabbe, Alexander (författare)
- Technical University of Denmark
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- Hagen, Nicolai (författare)
- Technical University of Denmark
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- Silva, Hugo (författare)
- Danish Technological Institute (DTI)
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- Just, Justus (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Damsgaard, Christian Danvad (författare)
- Technical University of Denmark
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- Helveg, Stig (författare)
- Technical University of Denmark
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- Rappe, Andrew M. (författare)
- University of Pennsylvania
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- Nørskov, Jens K. (författare)
- Technical University of Denmark
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- Chorkendorff, Ib (författare)
- Technical University of Denmark
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(creator_code:org_t)
- 2022-09-15
- 2022
- Engelska 10 s.
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Ingår i: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 126:38, s. 16194-16203
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Noble metal-based catalysts have numerous industrial uses, and maximum utilization of the precious metals by lowering the metal loading is of significant interest in heterogeneous catalysis research. However, lowering the metal loading could lead to single-atom metal species formation, which may not be active for important reactions like propylene oxidation. We report a way to drastically reduce precious metal loading of catalysts by judiciously choosing an active metal/support pair and using the reversible atomization-nanoparticulate formation of transition metal on a high-surface area support. Here, Pt and MgAl2O4 are used as the transition metal and high-surface area support, respectively. Through catalytic testing and characterization using scanning transmission electron microscopy and synchrotron X-ray absorption spectroscopy, a reversible change between atomization and nano-cluster formation under oxidizing and reducing conditions has been found. Via density functional theory, favorable sites for reversible Pt adsorption are identified, including ionic Pt4+ sites that can serve to nucleate nanoclusters. Catalytic reaction modeling also rationalizes the catalytic inertness of atomic Pt sites. Finally, a re-activation mechanism for the atomized Pt based on gases present during reaction has been formulated and demonstrated.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Chakraborty, Deb ...
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Smitshuysen, Tho ...
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Kakekhani, Arvin
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Jespersen, Sebas ...
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Banerjee, Sayan
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Krabbe, Alexande ...
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visa fler...
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Hagen, Nicolai
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Silva, Hugo
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Just, Justus
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Damsgaard, Chris ...
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Helveg, Stig
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Rappe, Andrew M.
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Nørskov, Jens K.
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Chorkendorff, Ib
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visa färre...
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- NATURVETENSKAP
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och Fysik
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och Atom och molekyl ...
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Lunds universitet