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molybdenum oxide powder is a white/light gray powder shaped like talcum powder, slightly soluble in water, soluble in alkali and acid, and has high purity. It is used as raw material to produce molybdenum metal in powder metallurgy, as molybdenum source additive of various molybdenum compounds and catalysts and in the production of enamel pigments. It is also used as co-catalyst for the industrial production of acrylonitrile by the oxidation of propane and ammonia.

The isothermal TG and DSC heat treatment of the two substoichiometric molybdenum oxides (Mo9O26 and Mo4O11) was performed on a synchronous thermal analyzer (STA 449 F3, NETZSCH, Selbu, Germany). As shown in Figure 2(a), the DSC curve contains three endothermic peaks at 774.1 degC, 811.3 degC and 1012.6 degC. The TG curve shows a mass reduction peak at 766.1 degC. Both the TG and DSC curves show that the two molybdenum oxides undergo structural changes with increasing temperature.

The inhalation of MoO3 in air results in lung damage characterized by eosinophilic infiltration and fibrosis with scattered bronchiolar nodules. Pneumoconiosis with x-ray findings has been observed in 3 of 19 workers exposed to MoO3 at levels up to 19 mg/cu m for 4-7 years. In addition, molybdenum oxide has been found to be a carcinogen in male F344/N rats exposed for 2 yr by increased incidences of alveolar/bronchiolar adenoma and carcinoma. For this reason, it is classified as a Class III carcinogen by the International Agency for Research on Cancer.

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