Application of oxide-metallic catalysts on valve metals for ecological catalysis

Abstract

It is shown that a promising technique for obtaining oxide-metallic catalysts is the plasma-electrolytic oxidation (PEO) of valve metals, particularly aluminum and titanium alloys. Such a mode of synthesis makes it possible to form catalytically active materials with a developed surface, high content of dopants, and a broad scope of application over a single-stage technological process. The d-metals, in particular, manganese and cobalt are most promising as the dopants for oxide-metallic catalysts.Employing results of the experimental studies, we demonstrated pathways to control the composition and degree of surface development of the mangan- and cobalt-containing oxide-metallic systems by using complex electrolytes. It is established that the obtained oxide coatings are characterized by high catalytic activity in the model conversion reactions of carbon (II) oxide. In terms of such critical process parameters as the degree of conversion and ignition temperature, they are not inferior to, and in some cases, outperform industrial platinum catalysts. The use of manganese-containing oxide-metallic coating of the piston in an internal combustion engine leads to lower fuel consumption and a reduction in the toxicity of gas emissions