Abstract
Abstract Gases evolved by the decomposition of ammonium paramolybdate tetrahydrate have been analyzed by means of an omegatron mass spectrometer. Only water molecules of the hydration were eliminated during the first stage of decomposition, and the final stage was not the elimination reaction of ammonia but the oxidation reaction of ammonia by Mo(VI) oxide. Between 150 and 250°C, ammonia and water were evolved in a mole ratio of roughly 2:1, corresponding to the elimination of (NH4)2O. However, the range is not clear because of the overlap of the elimination of water at the lower limit and that of nitrogen at the upper limit. At higher temperatures, a small amount of NO was observed.
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