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用程序升温还原(TPR)、X射线衍射(XRD)和原位Mssbauer谱(In Situ-MBS)等测定方法研究了Fe_2(MoO_4)_3在H_2/N_2气氛中的还原过程。结果表明,随着温度的提高,还原产物依次为β-FeMoO_4,Mo_4O_(11),MoO_2,Fe_3O_4,Fe_2Mo_3O_8,Fe,Mo及铁钼合金.Mo~(6+)在还原成Mo~(4+)的同时也将Fe~(2+)氧化成Fe~(3+),由于这种金属离子间存在的相互作用和电子的传递,使得Fe_2(MoO_4)_3中金属离子的还原变得很为复杂。通过对TPR图谱的剖析。提出了在不同还原阶段中Fe_2(MoO_4)_3的反应方程式,并首次得出Fe_2Mo_3O_8的Mssbauer谱参数为:I.S.=0.90mm/s,Q.S.=0.58mm/s和I.S.=1.02mm/s,Q.S.=1.04mm/S,其图谱为二组双线谱。
The reduction process of Fe_2 (MoO_4) _3 in H_2 / N_2 atmosphere was investigated by temperature programmed reduction (TPR), X-ray diffraction (XRD) and in situ Mssbauer spectroscopy (In Situ-MBS) The results show that the reduction products are β-FeMoO_4, Mo_4O_ (11), MoO_2, Fe_3O_4, Fe_2Mo_3O_8, Fe, Mo and iron-molybdenum alloys with increasing temperature.Mo ~ ) Also oxidizes Fe 2+ to Fe 3+. Due to the interaction between the metal ions and the transfer of electrons, the reduction of metal ions in Fe 2 (MoO 4) 3 becomes very much complex. Through the analysis of TPR atlas. The reaction equation of Fe_2 (MoO_4) _3 in different reduction stages was proposed and the Mssbauer spectral parameters of Fe_2Mo_3O_8 were obtained for the first time: IS = 0.90mm / s, QS = 0.58mm / s and IS = 1.02mm / s, QS = 1.04mm / S, the map for the two sets of two-line spectrum.