The high activity and stability of La0.5Ba0.5MnO3 nanocubes in the oxidation of CO and CH4

Abstract La 0.5 Ba 0.5 MnO 3 nanocubes and nanoparticles were synthesized by hydrothermal and co-precipitation methods, respectively. The catalytic performances and thermal stabilities of the samples in the oxidation of CO and CH 4 were evaluated. La 0.5 Ba 0.5 MnO 3 nanocubes showed much higher catalytic activity and thermal stability in CO and CH 4 oxidation compared with the nanoparticles. After running at 560 °C for 50 h under the reaction conditions in CH 4 oxidation, the surface area of the nanoparticles decreased significantly, while the nanocubes well maintained their surface area. Jahn–Teller effect had a significant influence on the catalytic performances of La 0.5 Ba 0.5 MnO 3 nanocubes and nanoparticles. The much higher catalytic activity and thermal stability of La 0.5 Ba 0.5 MnO 3 nanocubes were mainly predominated by the perfect single crystal structure.