| http://www.w3.org/ns/prov#value | - In the process for the preparation of vanadium - phosphorus containing catalysts comprising the reduction of pentavalent vanadium to a valence of less than +5 wherein the reducing agent is a mixture of an organic acid or aldehyde having 1 to 18 carbon atoms and a secondary alchol having 3 to 12 carbon atoms wherein the improvement comprises employing from about 75 to 90% of the stoichiometric amou
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