过渡金属修饰Fe2O3/Al2O3氧载体的Redox性能研究

采用冷冻干燥法分别制备了经Cu、Co、Mn、Ni修饰的Fe₂O₃/Al₂O₃氧载体。利用化学吸附仪,通过程序升温还原(H₂-TPR)和程序升温氧化(TPO)来研究经不同过渡金属修饰的Fe₂O₃/Al₂O₃与H₂和O₂的反应性能。实验发现,在Fe₂O₃/Al₂O₃中加入Cu、Co、Ni以后,氧载体与H₂的反应性都有提高,但是当在Fe₂O₃/Al₂O₃中加入Mn以后,氧载体的反应性和载氧能力反而下降。经Cu修饰的Fe₂O₃/Al₂O₃与H₂的反应性最高,且具有很好的反应稳定性,适合用于化学链燃烧。

Investigation on redox performance of transition metal decorated Fe2O3/Al2O3 oxygen carrier

Cu, Co, Mn and Ni decorated Fe₂O₃/Al₂O₃ oxygen carriers were prepared by freeze-drying method in this work. Temperature programmed reduction (H₂-TPR) and Temperature programmed oxidation (TPO) experiments were conducted in an automatic chemisorption instrument, and the reactivity of transition metal decorated Fe₂O₃/Al₂O₃ oxygen carriers with H₂ and O₂ was evaluated. The results showed that the reactivity for oxygen carrier with H₂ was improved after decorated with Cu, Co and Ni. But when decorated with Mn, the reactivity and oxygen transport capacity of oxygen carrier decreased. The Cu-decorated Fe₂O₃/Al₂O₃ oxygen carrier demonstrated the best reactivity with H₂ and favorable stability. Therefore, it could be a potential oxygen carrier for using in the chemical looping combustion.