Characterization of photoreduced Pt/TiO 2 and decomposition of dichloroacetic acid over photoreduced Pt/TiO 2 catalysts

J. C. Yang, Y. C. Kim, Yong-Gun Shul, C. H. Shin, T. K. Lee

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

The effect of photoreduction on the properties of Pt/TiO 2 catalysts was investigated. A decrease of the white-line area in the XANES spectra of Pt/TiO 2 catalysts at the Pt L III edge was observed with increasing photoreduction time, which denoted the photoreduction of Pt/TiO 2 with UV illumination. From the EXAFS fitting results, the growth of Pt particles with the photoreduction time could be monitored. The XPS spectra of Pt/TiO 2 catalysts at the Pt4f 5/2 and Pt4f 7/2 bands showed the presence of Pt 0 and Pt 2+ states after photoreduction and the fraction of metallic Pt 0 was increased with increasing photoreduction time. The optimum photoreduction time for DCA (dichloroacetic acid) decomposition was 6 h. The partially reduced state of Pt seems to be effective to obtain a high quantum yield in DCA decomposition with minimizing the agglomeration of Pt clusters on the TiO 2 surface.

Original languageEnglish
Pages (from-to)525-529
Number of pages5
JournalApplied Surface Science
Volume121-122
DOIs
Publication statusPublished - 1997 Jan 1

Fingerprint

Dichloroacetic Acid
Dichloroacetic acid
photochemical reactions
Decomposition
decomposition
catalysts
acids
Catalysts
Quantum yield
Agglomeration
X ray photoelectron spectroscopy
Lighting
agglomeration
illumination

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

@article{d2a0764898f54b1392a8b997e1a937e5,
title = "Characterization of photoreduced Pt/TiO 2 and decomposition of dichloroacetic acid over photoreduced Pt/TiO 2 catalysts",
abstract = "The effect of photoreduction on the properties of Pt/TiO 2 catalysts was investigated. A decrease of the white-line area in the XANES spectra of Pt/TiO 2 catalysts at the Pt L III edge was observed with increasing photoreduction time, which denoted the photoreduction of Pt/TiO 2 with UV illumination. From the EXAFS fitting results, the growth of Pt particles with the photoreduction time could be monitored. The XPS spectra of Pt/TiO 2 catalysts at the Pt4f 5/2 and Pt4f 7/2 bands showed the presence of Pt 0 and Pt 2+ states after photoreduction and the fraction of metallic Pt 0 was increased with increasing photoreduction time. The optimum photoreduction time for DCA (dichloroacetic acid) decomposition was 6 h. The partially reduced state of Pt seems to be effective to obtain a high quantum yield in DCA decomposition with minimizing the agglomeration of Pt clusters on the TiO 2 surface.",
author = "Yang, {J. C.} and Kim, {Y. C.} and Yong-Gun Shul and Shin, {C. H.} and Lee, {T. K.}",
year = "1997",
month = "1",
day = "1",
doi = "10.1016/S0169-4332(97)00359-0",
language = "English",
volume = "121-122",
pages = "525--529",
journal = "Applied Surface Science",
issn = "0169-4332",
publisher = "Elsevier",

}

Characterization of photoreduced Pt/TiO 2 and decomposition of dichloroacetic acid over photoreduced Pt/TiO 2 catalysts . / Yang, J. C.; Kim, Y. C.; Shul, Yong-Gun; Shin, C. H.; Lee, T. K.

In: Applied Surface Science, Vol. 121-122, 01.01.1997, p. 525-529.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Characterization of photoreduced Pt/TiO 2 and decomposition of dichloroacetic acid over photoreduced Pt/TiO 2 catalysts

AU - Yang, J. C.

AU - Kim, Y. C.

AU - Shul, Yong-Gun

AU - Shin, C. H.

AU - Lee, T. K.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - The effect of photoreduction on the properties of Pt/TiO 2 catalysts was investigated. A decrease of the white-line area in the XANES spectra of Pt/TiO 2 catalysts at the Pt L III edge was observed with increasing photoreduction time, which denoted the photoreduction of Pt/TiO 2 with UV illumination. From the EXAFS fitting results, the growth of Pt particles with the photoreduction time could be monitored. The XPS spectra of Pt/TiO 2 catalysts at the Pt4f 5/2 and Pt4f 7/2 bands showed the presence of Pt 0 and Pt 2+ states after photoreduction and the fraction of metallic Pt 0 was increased with increasing photoreduction time. The optimum photoreduction time for DCA (dichloroacetic acid) decomposition was 6 h. The partially reduced state of Pt seems to be effective to obtain a high quantum yield in DCA decomposition with minimizing the agglomeration of Pt clusters on the TiO 2 surface.

AB - The effect of photoreduction on the properties of Pt/TiO 2 catalysts was investigated. A decrease of the white-line area in the XANES spectra of Pt/TiO 2 catalysts at the Pt L III edge was observed with increasing photoreduction time, which denoted the photoreduction of Pt/TiO 2 with UV illumination. From the EXAFS fitting results, the growth of Pt particles with the photoreduction time could be monitored. The XPS spectra of Pt/TiO 2 catalysts at the Pt4f 5/2 and Pt4f 7/2 bands showed the presence of Pt 0 and Pt 2+ states after photoreduction and the fraction of metallic Pt 0 was increased with increasing photoreduction time. The optimum photoreduction time for DCA (dichloroacetic acid) decomposition was 6 h. The partially reduced state of Pt seems to be effective to obtain a high quantum yield in DCA decomposition with minimizing the agglomeration of Pt clusters on the TiO 2 surface.

UR - http://www.scopus.com/inward/record.url?scp=0031549723&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031549723&partnerID=8YFLogxK

U2 - 10.1016/S0169-4332(97)00359-0

DO - 10.1016/S0169-4332(97)00359-0

M3 - Article

AN - SCOPUS:0031549723

VL - 121-122

SP - 525

EP - 529

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

ER -