In this present study, carbothermic reduction process of MoO₃ to produce MoO₂ has been carried to investigate the influences of reaction temperature and distance between activated carbon and MoO₃ on phase composition of reduction products by controlling carbon diffusion. Results show that the reduction degree increases with the increase of temperature and the decrease of distance between activated carbon and MoO₃. MoO₃ can be completely reduced to MoO₂ at 680°C with the carbon distance of 1 mm. It is found that the transformation from MoO₃ to MoO₂ is a process of crystal cracking and growth by observing the phase transition and morphological evolution during the reduction. The massive MoO₃ is first decomposed into a platelet-shaped MoO_x (2.75 < x < 3), then the platelet-shaped MoO_x changes into a needle-like shape or irregular platelet-like Mo₄O₁₁, and finally Mo₄O₁₁ changes into irregular granular or irregular platelet-like shaped crystals, which form MoO₂ powders.

本研究采用碳热还原MoO ₃制备MoO ₂工艺，通过控制碳扩散，研究反应温度和活性炭与MoO ₃之间的距离对还原产物相组成的影响。结果表明，随着温度的升高和活性炭与MoO ₃距离的减小，还原程度增加。MoO ₃可在680°C完全还原为MoO ₂，​​碳距离为1 mm。发现 MoO ₃向 MoO _2的转变是通过观察还原过程中的相变和形态演变来晶体开裂和生长的过程。块状MoO ₃首先分解成片状MoO _x (2.75 < x < 3)，然后片状MoO _x变成针状或不规则片状Mo ₄ O ₁₁，最后变成Mo ₄ O ₁₁变成不规则的粒状或不规则的片状晶体，形成MoO ₂粉末。