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  Correlating Catalytic Methanol Oxidation with the Structure and Oxidation State of Size-Selected Pt Nanoparticles

Merte, L. R., Ahmadi, M., Behafarid, F., Ono, L. K., Lira, E., Matos, J., et al. (2013). Correlating Catalytic Methanol Oxidation with the Structure and Oxidation State of Size-Selected Pt Nanoparticles. ACS Catalysis, 3(7), 1460-1468. doi:10.1021/cs400234h.

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 Creators:
Merte, Lindsay R.1, Author
Ahmadi, Mahdi1, Author
Behafarid, Farzad1, Author
Ono, Luis K.1, Author
Lira, Estephania1, Author
Matos, Jeronimo1, Author
Li, Long2, Author
Yang, Judith C.2, Author
Roldan Cuenya, Beatriz1, Author           
Affiliations:
1Physics Department, University of Central Florida, ou_persistent22              
2Department of Chemical and Petroleum Engineering, Department of Physics, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States, ou_persistent22              

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 Abstract: We have investigated the structure and chemical state of size-selected platinum nanoparticles (NPs) prepared by micelle encapsulation and supported on γ-Al2O3 during the oxidation of methanol under oxygen-rich reaction conditions following both oxidative and reductive pretreatments. X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine-structure (EXAFS) spectroscopy measurements reveal that in both cases, the catalyst is substantially oxidized under reaction conditions at room temperature and becomes partially reduced when the reactor temperature is raised to 50 °C. Reactivity tests show that at low temperatures, the preoxidized catalyst, in which a larger degree of oxidation was observed, is more active than the prereduced catalyst. We conclude that the differences in reactivity can be linked to the formation and stabilization of distinct active oxide species during the pretreatment.

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Language(s): eng - English
 Dates: 2013-03-272013-05-162013-07-05
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/cs400234h
 Degree: -

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Title: ACS Catalysis
  Abbreviation : ACS Catal.
Source Genre: Journal
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Publ. Info: Washington, DC : ACS
Pages: 9 Volume / Issue: 3 (7) Sequence Number: - Start / End Page: 1460 - 1468 Identifier: ISSN: 2155-5435
CoNE: https://pure.mpg.de/cone/journals/resource/2155-5435