The high activity and stability of La_0.5Ba_0.5MnO₃ nanocubes in the oxidation of CO and CH₄

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• 作者：Shuhui Liang ; Tongguang Xu ; Fei Teng ; Ruilong Zong ; Yongfa Zhu
• 关键词：La_0.5Ba_0.5MnO₃ ; Nanocubes ; Single crystal structure ; Jahn– ; Teller distortion ; CO oxidation ; CH₄ oxidation
• 刊名：Applied Catalysis B: Environmental
• 出版年：2010
• 出版时间：7 June 2010
• 年：2010
• 卷：96
• 期：3-4
• 页码：267-275
• 全文大小：692 K

文摘

La_0.5Ba_0.5MnO₃ 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 CH₄ were evaluated. La_0.5Ba_0.5MnO₃ nanocubes showed much higher catalytic activity and thermal stability in CO and CH₄ oxidation compared with the nanoparticles. After running at 560 °C for 50 h under the reaction conditions in CH₄ 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_0.5Ba_0.5MnO₃ nanocubes and nanoparticles. The much higher catalytic activity and thermal stability of La_0.5Ba_0.5MnO₃ nanocubes were mainly predominated by the perfect single crystal structure.