Temperature-programmed reduction study on carbon-supported platinum-gold alloy catalysts

Kuan Wen Wang, Chuin Tih Yeh

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Alloy catalysts of Pt-Au/C with different Pt/Au ratios were prepared by the precipitation-deposition of metal chlorides and reduced by H2 at 470 K. The surface composition of alloy crystallites deposited on the prepared catalysts was characterized by a technique of temperature-programmed reduction (TPR). In the characterization, O2 was chemisorbed on the reduced catalysts and the chemisorbed O2 was reduced by TPR. A low-temperature routine (LT) in the temperature range between 120 and 430 K was used for the TPR characterization. Monometallic catalysts of Au/C and Pt/C showed a reduction peak in the LT-TPR at reduction temperature (Tr) = 145 and 240 K, respectively. Tr from alloyed catalysts fell in the range and increased monotonously with their Pt/Au ratios. Interior Pt atoms in deposited alloy particles tended to segregate toward their surface during oxidation treatment at elevated temperatures.

Original languageEnglish
Pages (from-to)203-206
Number of pages4
JournalJournal of Colloid and Interface Science
Volume325
Issue number1
DOIs
StatePublished - 1 Sep 2008

Keywords

  • Alloy
  • Gold
  • Platinum
  • Redox treatment
  • Temperature-programmed reduction

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