The thermal stability of MnMoO4-MoO3 catalysts for methanol oxidation has been studied. Formation of eutectie composition of 33 wt.% MnMoO4 and 67 wt% MoO3 and a melting point of 969-973K was observed. An attempt has been made to plot a state diagram of the MnMoO4-MoO3 system.The thermal stabilities of the Mn-Mo-O and commercial Fe-Mo-O catalysts have been compared. It has been concluded that manganese(II) molybdate catalysts are stable up to 973 K and are of a definite interest in view of their application in practice.
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