Preparation and characterization of V-K catalysts supported on porous α-alumina ceramic substrate for diesel soot oxidation

Abstract

The V-K catalysts were produced on porous α-alumina substrate by a solution impregnation route and the compositions and catalytic activities for soot oxidation were studied by XRD, TG/DTG, DSC and TPR. According to the catalytic activity studies, the catalytic activity of the crystalline phases is in the order: KNO₃+KVO₃>K₃V₅O₁₄+KVO₃. The appearance of excessive KHCO₃ phase will lead to the deterioration of catalytic activity when the catalysts contain higher KNO₃ content. It is also found that when the K:V molar ratio is higher than 1:1, the prepared catalysts show a strong CO₂ absorption characteristic and this behavior will become gradually significant with the increasing of K:V molar ratio. Considerable amount of absorbed CO₂ are strongly bonded to the crystal lattice with onset desorption temperature of 200 °C.

Keywords

V-K catalyst / oxidation / diesel soot / catalytic activity

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