Аннотация:In this work a detailed comparison of the N2O decomposition catalytic performance of LaCoO3 perovskite-likemixed oxides supported over different commercial materials was conducted. Zirconia-, silica- and γ-aluminabasedsupports were studied. Zirconia-based supports turned out to be the most applicable because of the formationof the pure LaCoO3 perovskite phase on their surface. Among these supports, ZrO2-La revealed to possessthe best activity owing to the highest Co2+/Co3+ (0.82) and Oads./OL (0.67) ratios on its surface. The raw ofactivities was as follows: LaCoO3(20 %)/ZrO2-La > LaCoO3(20 %)/ZrO2 > LaCoO3(20 %)/ZrO2-W. When theLaCoO3 content in LaCoO3/ZrO2-La was 20 wt%, the maximum of activity was observed – 94.78 mmol(N2O)/[g(cat.)⋅h] at 450 ◦C. This fact was in accordance with the highest Co2+/Co3+ (0.82) and Oads./OL (0.67) ratios atthe 20 wt% LaCoO3 content. Coordinatively unsaturated Co2+, forming Lewis acid-base pairs, were proposed tobe the active sites of the zirconia-based LaCoO3 catalysts in the N2O decomposition.
