A Facile Formation of Vanadium(0) by the Reduction of Vanadium Pentoxide Pelletized with Magnesium Oxide Enabled by Microwave Irradiation
A Facile Formation of Vanadium(0) by the Reduction of Vanadium Pentoxide Pelletized with Magnesium Oxide Enabled by Microwave Irradiation
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DOI：
10.1002/slct.201904547
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发表时间：
2020-03
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影响因子：
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通讯作者：
Naomi Inazu;E. Suzuki;S. Fujii;S. Tsubaki;Y. Wada
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文献类型：
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作者：
Naomi Inazu;E. Suzuki;S. Fujii;S. Tsubaki;Y. Wada
在820 W微波辐射条件下，在1273 K温度下，用镁蒸气还原V2 O 5得到金属钒（0）的反应在1 h内完成，V（0）的分离率为55.6%。 将粉末状V2 O 5与MgO粉末以特定的混合比充分混合，然后在环境空气中在1173 K下煅烧，这对于反应是至关重要的，因为MgV 2 O 4的复合氧化物（可能作为前体）在V2 O 5/MgO粒料的煅烧中形成，以通过与镁的反应还原为V（0）。 不同配比的V2 O 5/MgO球团在不同温度下煅烧，生成不同类型的钒镁复合氧化物，如α-Mg 2 V2 O 7、Mg3（VO 4）2、三斜晶系Mg 2 V2 O 7和MgV 2 O 6。虽然V（0）的产率取决于复合氧化物的种类，但MgV 2 O 4的形成是形成V（0）的前体。
The reduction of V2O5to vanadium metal(0), that requires severe conditions in conventional reduction methods, was enabled to be proceeded in a short time of 1 h at 1273 K by the reaction with magnesium vapor with the isolation yield of V(0) in 55.6% by using microwave irradiation of 820 W. A pressurized pelletization of powdery V2O5well‐mixed with MgO powder at a specific mixing ratio followed by calcination in ambient air at 1173 K was crucial for the reaction since a complex oxide of MgV2O4, presumably as a precursor, was formed in calcination of the V2O5/MgO pellet to be reduced to V(0) by the reaction with magnesium. Calcination of V2O5/MgO pellets with different mixing ratios or different temperatures resulted in the formation of different kinds of complex oxide of vanadium and magnesium such as α‐Mg2V2O7, Mg3(VO4)2, triclinic Mg2V2O7, and MgV2O6. While the yield of V(0) was dependent on the kind of the complex oxide, formation of MgV2O4was essential as the precursor to the formation of V(0).