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        Effects of catalyst preparation methods on the performance of La2MMnO6 (M=Co, Ni) double perovskites in catalytic combustion of propane

        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 35m2g1 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.

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