PdOx/SiO2+TiO2/Ti composites with different palladium contents have been fabricated by a combination of plasma electrolytic oxidation and template sal-gel synthesis on titanium substrates. The effect of multiplicity of deposition of titanium hydroxide gel with palladium nanoparticles on the composite composition and the surface morphology has been investigated. It has been established that the coatings surface is heterogeneous: it is built from alternating sites of different types with varying palladium content. Palladium is concentrated in nanosized structures of a diameter of 25-60 nm. The fabricated composites catalyze the reaction of oxidation of CO into CO2 at temperatures above 170 degrees C. It has been demonstrated that at the average concentration of palladium in coatings equal to 0.04 at.% the activation energy for this reaction is equal to similar to 55 kJ/mol, whereas at 0.1-0.2 at.% it is equal to similar to 46 kJ/mol. (C) 2014 Elsevier B.V. All rights reserved.