Abstract
It is shown by XRD that mixed oxide phases Cu0.92Co2.08O4 and Cu4MgO5 are formed along with the oxides CuO, Co3O4, MgO, and CaO under certain conditions. The positive catalytic effect of individual oxides (CuO and Co3O4) and mixed oxide systems (CuO-Cu0.92Co2.08O4, CuO-CaO, and Cu-MgO-Cu4MgO5) on the oxidation of diesel soot at 280–580°C is established, and a series of catalytic activities CuO-Cu0.92Co2.08O4 > CuO-MgO-Cu4MgO5 > CuO-CaO = CuO > Co3O4 is revealed. Using TEM, the surface micromorphology of crystallites that form oxide systems is characterized. It is found that a catalytic system’s activity increases as the size and surface smoothness of crystallites diminishes. According to data from X-ray photoelectron spectroscopy, a considerable increase in the concentration of O2 in soot with CuO and Co3O4 additives after its oxidation by oxygen is observed without changing the oxidation state of Cu and Co oxidation. The promoting effect of potassium additives in the form of K2CO3 on the investigated catalytic systems during soot oxidation is revealed.
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