Abstract
From the thermodynamical conciderations, it is expected that the reduction of vanadium oxide will be conducted like that of manganese oxide and accelerated by the co-existence with iron or nickel oxide. C, H. Fougner and E. J. Kohlmer, however, investigated the velocity of reduction of vanadium oxide by hydrogen at 1530° and obtained the results inferior to those above expected. The author, therefore, have studied again, using the absolutely dry hydrogen, the reduction of vanadium oxides at 1000° and 1100°, and have found it to agree with that of the thermodynamical calculations.
