A method for synthesising an essentially v2o5-free vanadium oxide having a mean vanadium oxidation state of at least +4 but lower than +5 from nh4vo3, said vanadium oxide preferably consisting essentially of v6oÕ13?, voÕ2? or any mixture thereof

摘要

PCT No. PCT/DK95/00480 Sec. 371 Date Nov. 7, 1997 Sec. 102(e) Date Nov. 7, 1997 PCT Filed Nov. 29, 1995 PCT Pub. No. WO96/17229 PCT Pub. Date Jun. 6, 1996A new method for synthesising an essentially V2O5-free vanadium oxide having a mean vanadium oxidation state of at least +4 but lower than +5 from NH4VO3 is disclosed. By this method NH4VO3 is heated to a reaction temperature sufficient for thermal decomposition of NH4VO3, and at said reaction temperature, the pressure is kept on at least 0.5 MPa. The method enables production of single-phase V6O13, single-phase VO2 as well as any mixture thereof in a remarkably simple manner, as it primarily involves careful control of temperature and pressure conditions. The synthesis method of the invention can thus be easily scaled up to any industrial requirement.