Effect of the composition of the reaction atmosphere on the thermal stability of highly dispersed gold particles on an oxide support (Au/Al2O3 system)


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Metal gold particles were supported onto the surface of aluminum oxide by physical vapor deposition. The effects of thermal treatments at 30−800°C both in a vacuum and in an atmosphere of O2 (5 mbar), CO (5 mbar), or a mixture of CO + O2 (5 mbar of each) on the samples of Au/Al2O3 were studied by X-ray photoelectron spectroscopy. An increase in the Au4f line intensity in the course of gold deposition was accompanied by a shift of this line toward smaller binding energy. Upon the supporting of a maximum quantity of gold, the binding energy Eb(Au4f7/2) became smaller than the value characteristic of the bulk metal. It was hypothesized that this can be explained by the formation of negatively charged Auδ− particles due to electron density transfer from the support to the particles of gold. In the course of the heating of Au/Al2O3 in a vacuum or in a reaction atmosphere, the agglomeration of small gold particles occurred; this fact manifested itself in a decrease in the atomic ratio [Au]/[Al]. In all of the atmospheres, the Au particles supported on Al2O3 exhibited high thermal stability; considerable changes in the ratio [Au]/[Al] were observed only at temperatures higher than 600°C.

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M. Smirnov

Boreskov Institute of Catalysis, Siberian Branch

编辑信件的主要联系方式.
Email: smirnov@catalysis.ru
俄罗斯联邦, Novosibirsk, 630090

E. Vovk

Boreskov Institute of Catalysis, Siberian Branch

Email: smirnov@catalysis.ru
俄罗斯联邦, Novosibirsk, 630090

A. Kalinkin

Boreskov Institute of Catalysis, Siberian Branch

Email: smirnov@catalysis.ru
俄罗斯联邦, Novosibirsk, 630090

V. Bukhtiyarov

Boreskov Institute of Catalysis, Siberian Branch

Email: smirnov@catalysis.ru
俄罗斯联邦, Novosibirsk, 630090

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