Abstract

Methods for the synthesis of LaNi_1/3Sb_5/3O₆ with a rosiaite structure have been developed using citrate method and coprecipitation followed by annealing. The influence of synthesis conditions on the morphology of the samples has been demonstrated. A comparative analysis of the catalytic properties of LaNi_1/3Sb_5/3O₆ synthesized by various methods, in the reaction of CO oxidation has been carried out. The catalyst synthesized by the citrate method demonstrated the greatest efficiency and stability (the temperature of 90% CO conversion was T₉₀ = 336°C). The LaNi_1/3Sb_5/3O₆ surface was studied before and after catalysis by in situ diffuse reflectance IR spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed O₂ desorption. It has been shown that the catalytic oxidation of CO on the LaNi_1/3Sb_5/3O₆ surface proceeds according to the Mars–van Krevelen mechanism and is accompanied by redox Sb³⁺ ↔ Sb⁵⁺ processes. It has been established that no contamination of the sample surface occurs during the catalysis process.

中文翻译：

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不同方法合成的LaNi1/3Sb5/3O6催化CO氧化

摘要

开发了采用柠檬酸盐法和共沉淀随后退火合成具有蔷薇石结构的LaNi _1/3 Sb _5/3 O ₆的方法。已经证明了合成条件对样品形貌的影响。对不同方法合成的LaNi _1/3 Sb _5/3 O ₆对CO氧化反应的催化性能进行了比较分析。通过柠檬酸盐法合成的催化剂表现出最高的效率和稳定性（90％CO转化的温度为T ₉₀ = 336℃）。_{通过原位漫反射红外光谱、X射线光电子能谱和程序升温O 2}解吸研究了催化前后的LaNi _1/3 Sb _5/3 O ₆表面。结果表明，CO在LaNi _1/3 Sb _5/3 O ₆表面上的催化氧化按照Mars-van Krevelen机制进行，并伴随着氧化还原Sb ³⁺ ↔ Sb ⁵⁺过程。已经确定在催化过程中样品表面不会发生污染。