In situ ATR-IR study of CO adsorption and oxidation over Pt/Al2O3 in gas and aqueous phase: Promotion effects by water and pH.

S.D. Ebbesen, Barbara Mojet, Leonardus Lefferts

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The adsorption and oxidation of carbon monoxide over a Pt/Al2O3 catalyst layer deposited on a ZnSe internal reflection element was investigated both in gas phase and water using attenuated total reflection infrared spectroscopy. A preparation method is described that results in a strongly attached layer that is stable for many days in a water flow. Both adsorption and oxidation of CO are largely affected by the presence of liquid water. It influences the metal particle potential as well as the CO molecule directly, which is reflected in large red shifts (45 cm−1) and a fourfold higher intensity when the experiments are carried out in water. Furthermore, the rate of CO oxidation changes significantly when carried out in water compared with gas phase. Finally, with increasing pH, CO stretching frequencies shift to lower wavenumbers, accompanied by a large increase in CO oxidation rate.
Original languageUndefined
Pages (from-to)66-73
Number of pages8
JournalJournal of catalysis
Volume246
Issue number1
DOIs
Publication statusPublished - 2007

Keywords

  • IR-74674
  • METIS-236844

Cite this

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title = "In situ ATR-IR study of CO adsorption and oxidation over Pt/Al2O3 in gas and aqueous phase: Promotion effects by water and pH.",
abstract = "The adsorption and oxidation of carbon monoxide over a Pt/Al2O3 catalyst layer deposited on a ZnSe internal reflection element was investigated both in gas phase and water using attenuated total reflection infrared spectroscopy. A preparation method is described that results in a strongly attached layer that is stable for many days in a water flow. Both adsorption and oxidation of CO are largely affected by the presence of liquid water. It influences the metal particle potential as well as the CO molecule directly, which is reflected in large red shifts (45 cm−1) and a fourfold higher intensity when the experiments are carried out in water. Furthermore, the rate of CO oxidation changes significantly when carried out in water compared with gas phase. Finally, with increasing pH, CO stretching frequencies shift to lower wavenumbers, accompanied by a large increase in CO oxidation rate.",
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In situ ATR-IR study of CO adsorption and oxidation over Pt/Al2O3 in gas and aqueous phase: Promotion effects by water and pH. / Ebbesen, S.D.; Mojet, Barbara; Lefferts, Leonardus.

In: Journal of catalysis, Vol. 246, No. 1, 2007, p. 66-73.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - In situ ATR-IR study of CO adsorption and oxidation over Pt/Al2O3 in gas and aqueous phase: Promotion effects by water and pH.

AU - Ebbesen, S.D.

AU - Mojet, Barbara

AU - Lefferts, Leonardus

PY - 2007

Y1 - 2007

N2 - The adsorption and oxidation of carbon monoxide over a Pt/Al2O3 catalyst layer deposited on a ZnSe internal reflection element was investigated both in gas phase and water using attenuated total reflection infrared spectroscopy. A preparation method is described that results in a strongly attached layer that is stable for many days in a water flow. Both adsorption and oxidation of CO are largely affected by the presence of liquid water. It influences the metal particle potential as well as the CO molecule directly, which is reflected in large red shifts (45 cm−1) and a fourfold higher intensity when the experiments are carried out in water. Furthermore, the rate of CO oxidation changes significantly when carried out in water compared with gas phase. Finally, with increasing pH, CO stretching frequencies shift to lower wavenumbers, accompanied by a large increase in CO oxidation rate.

AB - The adsorption and oxidation of carbon monoxide over a Pt/Al2O3 catalyst layer deposited on a ZnSe internal reflection element was investigated both in gas phase and water using attenuated total reflection infrared spectroscopy. A preparation method is described that results in a strongly attached layer that is stable for many days in a water flow. Both adsorption and oxidation of CO are largely affected by the presence of liquid water. It influences the metal particle potential as well as the CO molecule directly, which is reflected in large red shifts (45 cm−1) and a fourfold higher intensity when the experiments are carried out in water. Furthermore, the rate of CO oxidation changes significantly when carried out in water compared with gas phase. Finally, with increasing pH, CO stretching frequencies shift to lower wavenumbers, accompanied by a large increase in CO oxidation rate.

KW - IR-74674

KW - METIS-236844

U2 - 10.1016/j.jcat.2006.11.019

DO - 10.1016/j.jcat.2006.11.019

M3 - Article

VL - 246

SP - 66

EP - 73

JO - Journal of catalysis

JF - Journal of catalysis

SN - 0021-9517

IS - 1

ER -