A Double Perovskite Oxide with A-Site Deficiency: A Facile Way to Yield a Boosted Propane Combustion Catalyst

• Published in: Petroleum chemistry 2023-12, Vol.63 (11), p.1322-1334
• Main Authors: Moradkhani, Froud, Kootenaei, Amirhossein Shahbazi, Maghsoodi, Sarah, Mirzaei, Masoomeh, Azimi, Alireza
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Catalysts; Chemical synthesis; Chemistry; Chemistry and Materials Science; Combustion; Industrial Chemistry/Chemical Engineering; Low temperature; Metal catalysts; Methods; Noble metals; Oxidation; Oxides; Oxygen; Perovskite; Perovskites; Photochemical smog; Propane; VOCs; Volatile organic compounds
• ISSN: 0965-5441; 1555-6239
• DOI: 10.1134/S0965544123060014

Development of robust non-noble metal catalysts for combustive oxidation of volatile organic compounds (VOCs) at low temperatures is in high demand. A-site deficient perovskite catalysts synthesized by gel-combustion technique have been studied for the combustion of propane as a model for the abatement of hydrocarbon VOCs. Double perovskite oxides La 2– x NiMnO 6 with x = 0.0, 0.05, 0.1, and 0.15 have been prepared. As-prepared samples have been investigated within the temperature range of 200‒500°C and have shown an almost perfect selectivity to carbon dioxide. Certain levels of the A-site deficiency result in the development of more oxygen vacancies, improve oxygen mobility, and enhance the catalyst reducibility. However, an excessive A-site deficiency has been found to deteriorate the catalytic performance. The 72-h durability experiments on the most active sample, La 2‒0.1 NiMnO 6 perovskite, demonstrate its good stability and H 2 O tolerance. Though the CO 2 presence in a feed slightly altered the conversion of La 2 NiMnO 6 , and La 2‒0.1 NiMnO 6 catalysts, a significant conversion change has been observed for the La 2‒0.15 NiMnO 6 catalyst. Catalyst characterization techniques used in the study include XRD, BET, H 2 -TPR, O 2 -TPD, EPR, and ICP.