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Hamidreza Roozbahani,Sarah Maghsoodi,Behrouz Raei,Amirhossein Shahbazi Kootenaei,Zoha Azizi 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
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 35m2g1 after calcination at 500 oC. 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 oC 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 oC demonstrated the lowest activity.