In situ transient FTIR and XANES studies of the evolution of surface species in CO oxidation on Au/TiO2

Juan D. Henao, Tiziana Caputo, Jeff H. Yang, Mayfair C. Kung, Harold H Kung

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The adsorption of CO and its reaction with oxygen were investigated using a combination of in situ Fourier transform infrared spectroscopy, step response measurements in a microreactor, 18O isotopic labeling, and X-ray absorption near edge structure spectroscopy. An as-prepared sample in which Au is present as a surface oxyhydroxy complex does not adsorb CO. On an activated sample in which only metallic Au is detected, 0.18 ± 0.03 mol CO/(mol Au) are adsorbed on Au at -60°C, which shows an IR band at 2090 cm -1. When oxygen is present in the gas phase, this species reacts with a turnover rate of 1.4 ± 0.2 mol CO(mol Au min)-1, which is close to the steady-state turnover rate. In contrast, there is a very small quantity of adsorbed oxygen on Au. A small IR peak at,1242 cm-1 appears when an activated sample is exposed to CO. It reacts rapidly with oxygen and is shifted to 1236 cm-1 if 18O is used. It is assigned to the possible intermediate hydroxycarbonyl.

Original languageEnglish
Pages (from-to)8689-8700
Number of pages12
JournalJournal of Physical Chemistry B
Volume110
Issue number17
DOIs
Publication statusPublished - May 4 2006

Fingerprint

Carbon Monoxide
Oxidation
oxidation
Oxygen
oxygen
isotopic labeling
X ray absorption near edge structure spectroscopy
Step response
Labeling
Fourier transform infrared spectroscopy
infrared spectroscopy
vapor phases
Adsorption
Gases
adsorption
spectroscopy
x rays

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

In situ transient FTIR and XANES studies of the evolution of surface species in CO oxidation on Au/TiO2. / Henao, Juan D.; Caputo, Tiziana; Yang, Jeff H.; Kung, Mayfair C.; Kung, Harold H.

In: Journal of Physical Chemistry B, Vol. 110, No. 17, 04.05.2006, p. 8689-8700.

Research output: Contribution to journalArticle

Henao, Juan D. ; Caputo, Tiziana ; Yang, Jeff H. ; Kung, Mayfair C. ; Kung, Harold H. / In situ transient FTIR and XANES studies of the evolution of surface species in CO oxidation on Au/TiO2. In: Journal of Physical Chemistry B. 2006 ; Vol. 110, No. 17. pp. 8689-8700.
@article{373cf2f71de44774a572fe1fae61ef57,
title = "In situ transient FTIR and XANES studies of the evolution of surface species in CO oxidation on Au/TiO2",
abstract = "The adsorption of CO and its reaction with oxygen were investigated using a combination of in situ Fourier transform infrared spectroscopy, step response measurements in a microreactor, 18O isotopic labeling, and X-ray absorption near edge structure spectroscopy. An as-prepared sample in which Au is present as a surface oxyhydroxy complex does not adsorb CO. On an activated sample in which only metallic Au is detected, 0.18 ± 0.03 mol CO/(mol Au) are adsorbed on Au at -60°C, which shows an IR band at 2090 cm -1. When oxygen is present in the gas phase, this species reacts with a turnover rate of 1.4 ± 0.2 mol CO(mol Au min)-1, which is close to the steady-state turnover rate. In contrast, there is a very small quantity of adsorbed oxygen on Au. A small IR peak at,1242 cm-1 appears when an activated sample is exposed to CO. It reacts rapidly with oxygen and is shifted to 1236 cm-1 if 18O is used. It is assigned to the possible intermediate hydroxycarbonyl.",
author = "Henao, {Juan D.} and Tiziana Caputo and Yang, {Jeff H.} and Kung, {Mayfair C.} and Kung, {Harold H}",
year = "2006",
month = "5",
day = "4",
doi = "10.1021/jp0568733",
language = "English",
volume = "110",
pages = "8689--8700",
journal = "Journal of Physical Chemistry B Materials",
issn = "1520-6106",
publisher = "American Chemical Society",
number = "17",

}

TY - JOUR

T1 - In situ transient FTIR and XANES studies of the evolution of surface species in CO oxidation on Au/TiO2

AU - Henao, Juan D.

AU - Caputo, Tiziana

AU - Yang, Jeff H.

AU - Kung, Mayfair C.

AU - Kung, Harold H

PY - 2006/5/4

Y1 - 2006/5/4

N2 - The adsorption of CO and its reaction with oxygen were investigated using a combination of in situ Fourier transform infrared spectroscopy, step response measurements in a microreactor, 18O isotopic labeling, and X-ray absorption near edge structure spectroscopy. An as-prepared sample in which Au is present as a surface oxyhydroxy complex does not adsorb CO. On an activated sample in which only metallic Au is detected, 0.18 ± 0.03 mol CO/(mol Au) are adsorbed on Au at -60°C, which shows an IR band at 2090 cm -1. When oxygen is present in the gas phase, this species reacts with a turnover rate of 1.4 ± 0.2 mol CO(mol Au min)-1, which is close to the steady-state turnover rate. In contrast, there is a very small quantity of adsorbed oxygen on Au. A small IR peak at,1242 cm-1 appears when an activated sample is exposed to CO. It reacts rapidly with oxygen and is shifted to 1236 cm-1 if 18O is used. It is assigned to the possible intermediate hydroxycarbonyl.

AB - The adsorption of CO and its reaction with oxygen were investigated using a combination of in situ Fourier transform infrared spectroscopy, step response measurements in a microreactor, 18O isotopic labeling, and X-ray absorption near edge structure spectroscopy. An as-prepared sample in which Au is present as a surface oxyhydroxy complex does not adsorb CO. On an activated sample in which only metallic Au is detected, 0.18 ± 0.03 mol CO/(mol Au) are adsorbed on Au at -60°C, which shows an IR band at 2090 cm -1. When oxygen is present in the gas phase, this species reacts with a turnover rate of 1.4 ± 0.2 mol CO(mol Au min)-1, which is close to the steady-state turnover rate. In contrast, there is a very small quantity of adsorbed oxygen on Au. A small IR peak at,1242 cm-1 appears when an activated sample is exposed to CO. It reacts rapidly with oxygen and is shifted to 1236 cm-1 if 18O is used. It is assigned to the possible intermediate hydroxycarbonyl.

UR - http://www.scopus.com/inward/record.url?scp=33744468288&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33744468288&partnerID=8YFLogxK

U2 - 10.1021/jp0568733

DO - 10.1021/jp0568733

M3 - Article

VL - 110

SP - 8689

EP - 8700

JO - Journal of Physical Chemistry B Materials

JF - Journal of Physical Chemistry B Materials

SN - 1520-6106

IS - 17

ER -