以水滑石为前体 ,制备了镁铁和镁铁铝复合氧化物催化剂 ,运用原位穆斯堡尔谱研究了催化剂在H2 气氛中的还原行为。结果表明 :由于Mg、Al的加入和固溶体的形成 ,相对地稳定了FeO物相 ,阻碍了H2 对铁离子的还原 ,使得Fe2 +进一步还原为金属Fe0 的能力减弱 ;在还原过程中催化剂首先生成含Fe2 +的固溶体FeO MgO或FeO MgO Al2O3,然后再完全还原成金属Fe0。 The hydrotalcite and mafic-alumina composite oxide catalysts were prepared by using hydrotalcite as precursor, and the reduction behavior of the catalyst in H2 atmosphere was investigated by in situ Mössbauer spectroscopy. The results show that due to the addition of Mg and Al and the formation of solid solution, the phase of FeO is relatively stable and the reduction of H2 to iron ions is hindered. The reduction of Fe2 + to metal Fe0 further weakens. During the reduction process, the catalyst first forms Fe2 + containing solid solution FeO MgO or FeO MgO Al2O3, and then completely reduced to metal Fe0.