Features of Coalescence of Gold on the Surface
of Different Supports during Catalytic Oxidation of CO
I. V. Lukiyanchuka, *, M. S. Vasilyevaa, b, A. A. Sergeevc,
A. V. Nepomnyashchiic, M. M. Serovd, and B. L. Kritd
a Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, 690022 Russia
b Far Eastern Federal University, Vladivostok, 690922 Russia
c Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, 690041 Russia
d Moscow Aviation Institute (National Research University), Moscow, 125993 Russia
Correspondence to: *e-mail: lukiyanchuk@ich.dvo.ru
Received 9 June, 2020
Abstract—Ultra-thin (of a thickness of 10 nm) gold films have been deposited on the surface of different supports by electron-beam deposition. The supports comprised titanium and zirconium fibers formed by the pendant drop melt extraction and titanium plates treated by plasma electrolytic oxidation. The Au/Zr, Au/Ti (based on fibers), and Au/TiO2/Ti (based on oxidized titanium) composites have been tested in the CO oxidation reaction. It has been shown that the deposition of gold increases the catalytic activity of titanium and zirconium fibers, but has an insignificant effect on the activity of oxidized titanium. It was established that, upon contact with a gas mixture at temperatures up to 500°C, gold particles were accumulated in droplets, the size and number of which depended on the nature of the metal and the thickness of the oxide film on its surface.
Keywords: gold deposition, metal fibers, pendant drop melt extraction, plasma electrolytic oxidation, CO oxidation, gold coalescence
DOI: 10.1134/S207020512104016X