Effect of Pt structure on the kinetics of NO oxidation as studied by Pt(321) and Pt(111) large single crystals and supported clusters from 2-9 nm

Fabio H. Ribeiro, Shadab S. Mulla, Andrew D. Smeltz, Seung Min Kim, W. Nicholas Delgass, Jeffrey T. Miller, Robert Martin Rioux, Jr., Eric A. Stach

Research output: Contribution to journalConference article

Abstract

The kinetics of NO to NO2 oxidation with O2 on Pt was studied on the large single crystals Pt(321), Pt(111) and on clusters from 2-9 nm supported on alumina, silica, carbon and niobia. The rates on all samples were measured under the same conditions and thus the kinetics can be directly compared. Based on the kinetics, in situ XPS, in situ x-ray absorption, and environmental TEM we concluded that the reaction happens on a Pt surface covered with about 0.7 ML of oxygen and is independent of the underlying structure of the Pt except that smaller particles oxidize completely and become inactive. The complete oxidation of the Pt clusters is a strong function of particle size and explains the size dependence on the turnover rate. The turnover rate is constant for all samples when normalized to the amount of Pt that does not over-oxidize.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - Dec 1 2010

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Single crystals
Oxidation
Kinetics
Aluminum Oxide
Silicon Dioxide
Alumina
Carbon
X ray photoelectron spectroscopy
Particle size
Silica
Oxygen
Transmission electron microscopy
X rays

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Ribeiro, Fabio H. ; Mulla, Shadab S. ; Smeltz, Andrew D. ; Kim, Seung Min ; Delgass, W. Nicholas ; Miller, Jeffrey T. ; Rioux, Jr., Robert Martin ; Stach, Eric A. / Effect of Pt structure on the kinetics of NO oxidation as studied by Pt(321) and Pt(111) large single crystals and supported clusters from 2-9 nm. In: ACS National Meeting Book of Abstracts. 2010.
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abstract = "The kinetics of NO to NO2 oxidation with O2 on Pt was studied on the large single crystals Pt(321), Pt(111) and on clusters from 2-9 nm supported on alumina, silica, carbon and niobia. The rates on all samples were measured under the same conditions and thus the kinetics can be directly compared. Based on the kinetics, in situ XPS, in situ x-ray absorption, and environmental TEM we concluded that the reaction happens on a Pt surface covered with about 0.7 ML of oxygen and is independent of the underlying structure of the Pt except that smaller particles oxidize completely and become inactive. The complete oxidation of the Pt clusters is a strong function of particle size and explains the size dependence on the turnover rate. The turnover rate is constant for all samples when normalized to the amount of Pt that does not over-oxidize.",
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Effect of Pt structure on the kinetics of NO oxidation as studied by Pt(321) and Pt(111) large single crystals and supported clusters from 2-9 nm. / Ribeiro, Fabio H.; Mulla, Shadab S.; Smeltz, Andrew D.; Kim, Seung Min; Delgass, W. Nicholas; Miller, Jeffrey T.; Rioux, Jr., Robert Martin; Stach, Eric A.

In: ACS National Meeting Book of Abstracts, 01.12.2010.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Effect of Pt structure on the kinetics of NO oxidation as studied by Pt(321) and Pt(111) large single crystals and supported clusters from 2-9 nm

AU - Ribeiro, Fabio H.

AU - Mulla, Shadab S.

AU - Smeltz, Andrew D.

AU - Kim, Seung Min

AU - Delgass, W. Nicholas

AU - Miller, Jeffrey T.

AU - Rioux, Jr., Robert Martin

AU - Stach, Eric A.

PY - 2010/12/1

Y1 - 2010/12/1

N2 - The kinetics of NO to NO2 oxidation with O2 on Pt was studied on the large single crystals Pt(321), Pt(111) and on clusters from 2-9 nm supported on alumina, silica, carbon and niobia. The rates on all samples were measured under the same conditions and thus the kinetics can be directly compared. Based on the kinetics, in situ XPS, in situ x-ray absorption, and environmental TEM we concluded that the reaction happens on a Pt surface covered with about 0.7 ML of oxygen and is independent of the underlying structure of the Pt except that smaller particles oxidize completely and become inactive. The complete oxidation of the Pt clusters is a strong function of particle size and explains the size dependence on the turnover rate. The turnover rate is constant for all samples when normalized to the amount of Pt that does not over-oxidize.

AB - The kinetics of NO to NO2 oxidation with O2 on Pt was studied on the large single crystals Pt(321), Pt(111) and on clusters from 2-9 nm supported on alumina, silica, carbon and niobia. The rates on all samples were measured under the same conditions and thus the kinetics can be directly compared. Based on the kinetics, in situ XPS, in situ x-ray absorption, and environmental TEM we concluded that the reaction happens on a Pt surface covered with about 0.7 ML of oxygen and is independent of the underlying structure of the Pt except that smaller particles oxidize completely and become inactive. The complete oxidation of the Pt clusters is a strong function of particle size and explains the size dependence on the turnover rate. The turnover rate is constant for all samples when normalized to the amount of Pt that does not over-oxidize.

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