Abstract

A series of oxide catalysts modified with potassium cations, 1–5% K₂О/CoFe₂O₄, with a spinel structure were obtained via mechanochemical synthesis. The obtained samples were studied via X-ray powder diffraction, nitrogen adsorption–desorption, temperature-programmed reduction with hydrogen, and temperature-programmed desorption of oxygen. It was shown that an increase in the potassium content leads to a significant decrease in the crystallinity of the oxide, an increase in the specific surface area, and the formation of weakly bound oxygen species; this favors an increase in the catalytic activity of the samples in the decomposition of nitrous oxide at 150–400°C. The most active catalyst was 5% K₂О/CoFe₂O₄, which had the maximum content of weakly bound oxygen species. It was determined that the presence of oxygen or water in the rection mixture decreases the activity in the low-temperature catalytic decomposition of N₂O.

中文翻译：

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N2O的低温催化分解

摘要

通过机械化学合成获得了一系列用钾阳离子改性的氧化物催化剂，1-5% K ₂ О/CoFe ₂ O ₄，具有尖晶石结构。获得的样品通过 X 射线粉末衍射、氮气吸附-解吸、氢气程序升温还原和氧气程序升温解吸进行了研究。结果表明，钾含量的增加导致氧化物结晶度显着降低，比表面积增加，形成弱结合氧；这有利于提高样品在 150–400°C 下分解一氧化二氮的催化活性。最活跃的催化剂是 5% K ₂ О/CoFe ₂ O₄，弱结合氧含量最高。_{已确定反应混合物中存在氧气或水会降低 N 2} O低温催化分解的活性。