Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 325, Issue 1, Pages 203-206Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2008.04.069
Keywords
platinum; gold; alloy; temperature-programmed reduction; redox treatment
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Alloy catalysts of Pt-Au/C with different Pt/Au ratios were prepared by the precipitation-deposition of metal chlorides and reduced by H-2 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, 02 was chemisorbed on the reduced catalysts and the chemisorbed O-2 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 (T-r) = 145 and 240 K, respectively. T-r 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. (C) 2008 Elsevier Inc. All rights reserved.
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