The nanostructural catalytic composition CuMoO4/TiO2 + SiO2/Ti for combustion of diesel soot

The combination of two methods, the plasma electrolytic oxidation (PEO) technique for the oxide film formation on titanium and the extraction-pyrolytic (EP) technique for catalytic active layers coating are suggested to use. After covering with Cu and Mo by equimolar mixture of extracts and subsequent pyrolysis the copper molybdate phase grains with diameter up to 200 nm are observed. Three-fivefold covering leads to the formation of copper molybdate continuous layer. The composition CuMoO4/TiO2 + SiO2/Ti has the most high catalytic ability; after twofold treatment (EP) of oxidized titanium surface, diesel soot oxidation takes place in lower temperature range (the initiation temperature of combustion, Ti = 270 °C) than powder molybdate sample (Ti = 340 °C). In subsurface layer of CuMoO4 (~ 3 nm) the presence of Cu+ and Mo4+ was observed, which can explain the high reactivity of the compositions CuMoO4/TiO2 + SiO2/Ti on initial stage of soot combustion.

► CuMoO4/TiO2 + SiO2/Ti catalytic composition for diesel soot oxidation
► The plasmic-electrochemical and the extraction-pyrolytic techniques were used.
► CuMoO4 nano-grains were observed on composition surface.
► Cu+ and Mo4+ ions were present in composition subsurfaсe layer.