Catalytic Oxidation of CO over LaNi1/3Sb5/3O6 Synthesized by Different Methods

• Published in: Russian journal of inorganic chemistry 2023-12, Vol.68 (12), p.1725-1736
• Main Authors: Egorysheva, A. V., Golodukhina, S. V., Plukchi, K. R., Liberman, E. Yu, Ellert, O. G., Naumkin, A. V., Chistyakov, A. V., Kolesnik, I. V., Arapova, O. V.
• Format: Article
• Language: English
• Subjects: Carbon monoxide; Catalysis; Chemical synthesis; Chemistry; Chemistry and Materials Science; Infrared spectroscopy; Inorganic Chemistry; Mars surface; Oxidation; Photoelectrons; Synthesis and Properties of Inorganic Compounds; X ray photoelectron spectroscopy
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023623602106

Methods for the synthesis of LaNi 1/3 Sb 5/3 O 6 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 1/3 Sb 5/3 O 6 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 T 90 = 336°C). The LaNi 1/3 Sb 5/3 O 6 surface was studied before and after catalysis by in situ diffuse reflectance IR spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed O 2 desorption. It has been shown that the catalytic oxidation of CO on the LaNi 1/3 Sb 5/3 O 6 surface proceeds according to the Mars–van Krevelen mechanism and is accompanied by redox Sb 3+ ↔ Sb 5+ processes. It has been established that no contamination of the sample surface occurs during the catalysis process.