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Volume 208, 2018
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In situ formation of the active sites in Pd–Au bimetallic nanocatalysts for CO oxidation: NAP (near ambient pressure) XPS and MS study

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Abstract

Model bimetallic Pd–Au/HOPG catalysts have been investigated in the CO oxidation reaction using a combination of NAP XPS and MS techniques. The samples have shown catalytic activity at temperatures above 150 °C. The redistribution of Au and Pd on the surface depending on the reaction conditions has been demonstrated using NAP XPS. The Pd enrichment of the bimetallic particles’ surface under reaction gas mixture has been shown. Apparently, CO adsorption induces Pd segregation on the surface. Heating the sample under reaction conditions above 150 °C decomposes the Pd–CO state due to CO desorption and reaction and simultaneous Pd–Au alloy formation on the surface takes place. Cooling back down to RT results in reversible Pd segregation due to Pd–CO formation and the sample becomes inactive. It has been shown that in situ studies are necessary for investigation of the active sites in Pd–Au bimetallic systems.

Graphical abstract: In situ formation of the active sites in Pd–Au bimetallic nanocatalysts for CO oxidation: NAP (near ambient pressure) XPS and MS study

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Submitted
19 Dec 2017
Accepted
24 Jan 2018
First published
24 Jan 2018

Faraday Discuss., 2018,208, 255-268
Article type
Paper

In situ formation of the active sites in Pd–Au bimetallic nanocatalysts for CO oxidation: NAP (near ambient pressure) XPS and MS study

A. V. Bukhtiyarov, I. P. Prosvirin, A. A. Saraev, A. Yu. Klyushin, A. Knop-Gericke and V. I. Bukhtiyarov, Faraday Discuss., 2018, 208, 255
DOI: 10.1039/C7FD00219J

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