Until now various oxygen carrier particles have been proposed for use in chemical looping processes. Their chemical performance is determined not only by their composition and their microstructure/morphology but also by the reaction condition of the processes in which they are utilized. In the present work, iron based oxygen carriers supported on Al₂O₃ and MgAl₂O₄ were spray dried and heat treated to have a suitable morphology and sufficient mechanical properties for chemical looping. The MgAl₂O₄-support was in situ generated from MgO and Al₂O₃ by reaction sintering. After physical characterization and determining their compressive strength the oxygen carriers were tested in the chemical looping reforming process for producing syngas in a lab-scale batch fluidized-bed reactor. The suitability of utilizing steam regeneration was investigated for both oxygen carriers by relating their chemical performance to their composition. It was shown that the Al₂O₃-supported oxygen carrier deactivated after 9 cycles of steam regeneration because of the accumulation of an in-situ formed FeAl₂O₄-phase due to an irreversible reaction between support and the active phase. This deactivation was successfully avoided by replacing the Al₂O₃-support with MgAl₂O₄. This Fe₂O₃/MgAl₂O₄ oxygen carrier could be subsequently regenerated by steam, making it suitable for chemical looping for hydrogen generation.

迄今为止，已经提出了各种氧气载体颗粒用于化学环化工艺。它们的化学性能不仅取决于它们的组成和微观结构/形态，还取决于使用它们的过程的反应条件。在本发明中，将负载在Al ₂ O ₃和MgAl ₂ O ₄上的铁基氧载体喷雾干燥并进行热处理，以具有合适的形态和足够的机械性能用于化学成环。由MgO和Al ₂ O ₃原位生成MgAl ₂ O _4-载体通过反应烧结。物理表征并确定其抗压强度后，在实验室规模的分批流化床反应器中，通过化学循环重整工艺对氧气载体进行了测试，以生产合成气。通过将两种氧气载体的化学性能与其成分相关联，研究了利用蒸汽再生的适用性。结果表明，由于载体与活性相之间不可逆的反应，原位形成的FeAl ₂ O ₄相的积累，使Al ₂ O ₃负载的氧载体在9个蒸汽再生循环后失活。通过替代Al ₂ O _3可以成功避免这种失活-用MgAl ₂ O ₄支撑。该Fe ₂ O ₃ / MgAl ₂ O ₄氧载体可以随后通过蒸汽再生，使其适合用于氢气的化学循环。