A key challenge for the further progress of chemical looping and its introduction into industrial processes is the development of effective functional materials. In this connection, the present work evaluates strontium hexaferrite SrFeO for possible use as an oxygen carrier material. Coulometric titration was employed to investigate the process of oxygen release from SrFeO during reductive decomposition at temperatures of 800–950 °C. Based on the obtained results, hexaferrite is characterized as a promising, self-supported oxygen carrier for the chemical looping processes in the mode of its decomposition to metallic iron and complex oxides belonging to the (SrO·nFeO) system. The recyclability of oxide over 10 redox cycles at 850 and 950 °C was confirmed by TGA experiments. The revealed channels and longitudinal spaces emerging between grains of the favorably-formed bed affect the results of the cycling experiments. Along with the experimental data obtained in the course of experiments in a fixed bed reactor, the estimated kinetic parameters and results of thermodynamic modeling suggest SrFeO as an oxygen carrier for achieving high performance in chemical looping processes involving the partial oxidation of carbon or organic compounds.

中文翻译：

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用于化学循环的自支撑氧载体 SrFe12O19：热力学分析、动力学和氧化还原稳定性

化学循环的进一步进展及其引入工业过程的一个关键挑战是开发有效的功能材料。在这方面，目前的工作评估了锶六方铁氧体SrFeO作为氧载体材料的可能用途。采用库仑滴定法研究了 SrFeO 在 800–950 °C 温度下还原分解过程中释放氧气的过程。基于所获得的结果，六方铁氧体被描述为一种有前途的自支撑氧载体，用于化学循环过程，其分解为金属铁和属于(SrO·nFeO)系统的复合氧化物。TGA 实验证实了氧化物在 850 和 950 °C 下经过 10 次氧化还原循环后的可回收性。形成良好的床的颗粒之间出现的显露通道和纵向空间会影响循环实验的结果。结合固定床反应器实验过程中获得的实验数据，估计的动力学参数和热力学模型结果表明，SrFeO 作为氧载体，可在涉及碳或有机化合物部分氧化的化学循环过程中实现高性能。