Abstract A series of La-Mn-Fe-O perovskite oxides were prepared successfully and used as oxygen carriers for the Chemical-looping reforming of methane to produce pure syngas and hydrogen. The textural properties of the La-Mn-Fe-O oxygen carriers play important role on the reactivity. The effect of calcination temperature on structure properties of the La0.85MnFe0.15O3 and LaMn0.9Fe0.1O3 were investigated in detail. It was found that the series of La0.85MnFe0.15O3 samples exhibited a better structural and porous properties. The samples calcined at 800 °C exhibited higher concentration of oxygen vacancies and better oxygen mobility. In the CH4 isothermal reaction, the appropriate H2/CO ratio is 2.0. La0.85MnFe0.15O3-800 still maintained at an ideal value (around 2.0) during the 9 cycled reactions. In addition, La0.85MnFe0.15O3-800 exhibited the best reactivity during the successive redox cycles, presenting better thermal stability. After 9 times successive redox experiments, the series of La0.85MnFe0.15O3 samples showed smaller crystal size, presenting better structural stability.

中文翻译：

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La-Mn-Fe-O氧载体上甲烷的化学链重整：煅烧温度的影响

摘要 成功制备了一系列La-Mn-Fe-O钙钛矿氧化物，并将其用作氧载体，用于甲烷化学循环重整制取纯合成气和氢气。La-Mn-Fe-O 氧载体的结构特性对反应性起着重要作用。详细研究了煅烧温度对La0.85MnFe0.15O3和LaMn0.9Fe0.1O3结构性能的影响。结果表明，La0.85MnFe0.15O3系列样品表现出更好的结构和多孔性能。在 800 °C 下煅烧的样品表现出更高的氧空位浓度和更好的氧迁移率。在 CH4 等温反应中，合适的 H2/CO 比为 2.0。La0.85MnFe0.15O3-800 在 9 个循环反应过程中仍保持在理想值（约 2.0）。此外，La0.85MnFe0. 15O3-800 在连续的氧化还原循环中表现出最好的反应性，表现出更好的热稳定性。经过9次连续氧化还原实验，La0.85MnFe0.15O3系列样品的晶体尺寸更小，结构稳定性更好。