Abstract The behavior of chemical looping reforming of methane over the magnetite oxygen carrier (OC) has been investigated by thermodynamic analysis and experiments, which clarified the appropriate operating conditions and material composition. The possible revolution of the reaction composition and the corresponding isothermal redox reactions also have been carried out. Compared with the effect of temperature rise (800 - 1000 °C) on the formation of carbon deposition, it is more conducive to the reduction of iron oxide. In the oxidation stage, the temperature of 400-650 °C is favorable for inhibiting the formation of C and Fe3C, which greatly influenced the quality of hydrogen production. The compounds such as FeTiO3, FeTi2O5 and Fe2TiO5 can be regenerated by water vapor. However, FeAl2O4 and MgFe2O4 are irreversible, resulting in the loss of reducible iron species. Equilibrium composition study revealed that syngas with an ideal ratio of (H2/CO = 2) can be obtained at a temperature higher than 900 °C, while the carbon deposition has been inhibited. Both the thermodynamic analysis and experiment showed that the chemical thermodynamics analysis method is a leading approach for the reaction characteristic studies of chemical looping reforming of methane.

中文翻译：

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甲烷化学循环重整磁铁矿氧载体的热力学演化

摘要 通过热力学分析和实验研究了甲烷在磁铁氧载体（OC）上的化学循环重整行为，阐明了合适的操作条件和材料组成。也进行了可能的反应组合物革命和相应的等温氧化还原反应。与升温（800-1000℃）对积碳形成的影响相比，更有利于氧化铁的还原。在氧化阶段，400-650℃的温度有利于抑制C和Fe3C的形成，对制氢质量有很大影响。FeTiO3、FeTi2O5、Fe2TiO5等化合物可以通过水蒸气再生。然而，FeAl2O4 和 MgFe2O4 是不可逆的，导致可还原铁种类的损失。平衡成分研究表明，在高于 900 °C 的温度下可以获得理想比例为 (H2/CO = 2) 的合成气，同时抑制了碳沉积。热力学分析和实验表明，化学热力学分析方法是甲烷化学链重整反应特性研究的主要方法。