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Reactivity of Pt/ce...
Reactivity of Pt/ceria and Pt/alumina planar model catalysts prepared by colloidal lithography
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- Österlund, Lars, 1967- (författare)
- Uppsala universitet,Fasta tillståndets fysik
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- Kielbassa, S (författare)
- Chalmers University of Technology
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- Werdinius, C (författare)
- Chalmers University of Technology
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- Kasemo, B (författare)
- Chalmers University of Technology
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(creator_code:org_t)
- 2003
- 2003
- Engelska.
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Ingår i: Journal of Catalysis. - 0021-9517 .- 1090-2694. ; 215:1, s. 94-107
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- We report on the structure, chemical state, and catalytic activity of nanofabricated, planar Pt/ceria and Pt/alumina model catalysts prepared by colloidal lithography. Employing extended etching times, catalyst particles are fabricated that are much smaller than the size of the polystyrene colloidal particle mask. Using CO oxidation as a probe reaction, the influence of various pretreatments has been studied. We find that the H-2/O-2 pretreatment deteriorates the reactivity on Pt/alumina, which is accompanied by blocking of the high-temperature CO adsorption sites as seen by TPD. After prolonged reactions the Pt/ceria particles show pronounced restructuring, indicating a low-temperature, reaction-induced, strong metal-support interaction, where ceria is decorating the Pt particles. In contrast, after an identical reaction history the Pt/alumina particles become facetted. The nanofabrication approach allows us to attribute the structural changes on individual particles to the integrated, macroscopic catalytic response. (C) 2003 Elsevier Science (USA). All rights reserved.
Nyckelord
- nanofabrication
- colloidal lithography
- model catalyst
- Pt/alumina
- Pt/ceria
- strong metal-support interaction
- CO oxidation
- pretreatments
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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