A Facile Formation of Vanadium(0) by the Reduction of Vanadium Pentoxide Pelletized with Magnesium Oxide Enabled by Microwave Irradiation. Issue 10 (11th March 2020)

• Record Type: Journal Article
• Authors: Inazu, Naomi; Suzuki, Eiichi; Fujii, Satoshi; Tsubaki, Shuntaro; Wada, Yuji
• Is Part Of: ChemistrySelect. Volume 5:Issue 10(2020)
• Page Start: 2949
• Page End: 2953
• Publication Date: 2020-03-11
• Subjects: complex oxide -- magnesium -- microwave irradiation -- vanadium -- vanadium oxide; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201904547
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The reduction of V2 O5 to 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 V2 O5 well‐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 MgV2 O4, presumably as a precursor, was formed in calcination of the V2 O5 /MgO pellet to be reduced to V(0) by the reaction with magnesium. Calcination of V2 O5 /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‐Mg2 V2 O7, Mg3 (VO4 )2, triclinic Mg2 V2 O7, and MgV2 O6 . While the yield of V(0) was dependent on the kind of the complex oxide, formation of MgV2 O4 was essential as the precursor to the formation of V(0). Abstract : The reduction of V2 O5 to V(0) with Mg(0) is enabled by the calcination of a pelletized mixture of V2 O5 and MgO to form MgV2 O4 and the following microwave irradiation in the presence of Mg(0) for just a short period of time as 1 h.