Ferrites have been investigated as the most promising and active redox materials for two-step thermochemical CO₂ splitting. Reactions are conducted in a two-step cycle, in which the ferrites are generally reduced at 1400 °C in an inert atmosphere, then the reduced ferrites are re-oxidized by reacting with CO₂ at 1000 °C to produce CO. In this work, MgFeO ferrites (designated as FM-x, x denotes as the mole fraction of Fe₂O₃ to MgO + Fe₂O₃) were screened for activity in two-step thermochemical CO₂ splitting. Ferrites were characterized by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman and Mössbauer spectroscopies. The self-regenerative function and internal reaction, which are responsible for the initial higher CO production rate and a greater utilization of the bulk ferrites, respectively, were confirmed for MgFeO ferrites. Consequently, the self-regenerative FM-0.2 with internal reaction possesses a 2.2 times higher CO yield as compared with that of FM-0.5. Kinetic analysis was conducted in consideration of various solid state reaction models, and bulk diffusion, which is an indication of internal reaction, was found to be the crucial factor for the accessibility of the bulk redox species.

已经研究了铁氧体作为用于两步热化学CO ₂分解的最有前途和最活跃的氧化还原材料。反应分两步进行，其中铁素体通常在惰性气氛下于1400°C还原，然后还原的铁氧体通过与1000°C的CO ₂反应再氧化以生成CO。 ，筛选了Mg Fe O铁氧体（标记为FM-x，x表示Fe ₂ O ₃对MgO + Fe ₂ O ₃的摩尔分数）在两步热化学CO _2中的活性分裂。通过差示扫描量热法（DSC），X射线衍射（XRD），扫描电子显微镜（SEM），拉曼光谱和Mössbauer光谱对铁氧体进行了表征。对于Mg Fe O铁氧体，证实了分别负责最初较高的CO产生速率和更大的块状铁氧体利用率的自我再生功能和内部反应。因此，具有内部反应的自再生FM-0.2具有比FM-0.5高2.2倍的CO收率。动力学分析是考虑到各种固态反应模型而进行的，本体扩散是内部反应的指示，被发现是本体氧化还原物质可及性的关键因素。