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Issue
Korean Journal of Chemical Engineering,
Vol.39, No.3, 586-595, 2022
Effects of catalyst preparation methods on the performance of La2MMnO6 (M=Co, Ni)double perovskites in catalytic combustion of propane
Roozbahani H, Maghsoodi S, Raei B, Kootenaei AS, Azizi Z
La2MMnO6 (M=Co, Ni) dual perovskite oxides were synthesized by sol-gel and gel-combustion methods and tested for the total oxidation of propane. The synthesized catalysts were characterized by TPR, XRD, ICP, SEM, TEM, H2-TPR and O2-TPD techniques. The preparation method had a significant effect on the physicochemical properties of samples. The XRD spectra resulting from the synthesized samples revealed the formation of single-phase perovskite structure. The largest BET specific surface area related to the La2NiMnO6 perovskite synthesized by the gelcombustion method was obtained as 35m2g-1 after calcination at 500℃. Based on the findings, the catalysts synthesized by the gel-combustion method showed an increase in specific surface area, oxygen capacity, reducibility and oxygen mobility compared to those synthesized by the sol-gel method. Accordingly, these catalysts revealed a better performance. The acquired results also showed that the presence of Ni improved the catalytic activity compared to Co. The La2NiMnO6 perovskite synthesized by the gel-combustion method with the T90 equal to 415℃ was found to be the most active catalyst, while the La2CoMnO6 double perovskite synthesized by the sol-gel method with the T90 equal to 474℃ demonstrated the lowest activity.
Keywords: Catalyst; Combustion; Double Perovskite; Sol-gel; Gel-combustion
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