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Molybdenum trioxide describes a family of inorganic compounds with the formula MoO 3 (H 2 O) n where n = 0, 1, 2. The anhydrous compound is produced on the largest scale of any molybdenum compound since it is the main intermediate produced when molybdenum ores are purified. The anhydrous oxide is a precursor to molybdenum metal, an important ...
Weak oxidation of molybdenum starts at 300 °C (572 °F); bulk oxidation occurs at temperatures above 600 °C, resulting in molybdenum trioxide. Like many heavier transition metals, molybdenum shows little inclination to form a cation in aqueous solution, although the Mo 3+ cation is known to form under carefully controlled conditions.
Molybdic acid refers to hydrated forms of molybdenum trioxide and related species. The monohydrate (MoO 3 ·H 2 O) and the dihydrate (MoO 3 ·2H 2 O) are well characterized. They are yellow diamagnetic solids.
Molybdenum(IV) oxide (molybdenum dioxide, MoO 2) Molybdenum(VI) oxide (molybdenum trioxide, MoO 3) Other stoichiometric binary molybdenum-oxygen compounds include Mo 8 O
Molybdenum dioxide is a constituent of "technical molybdenum trioxide" produced during the industrial processing of MoS 2: [4] [5] 2 MoS 2 + 7 O 2 → 2 MoO 3 + 4 SO 2 MoS 2 + 6 MoO 3 → 7 MoO 2 + 2 SO 2 2 MoO 2 + O 2 → 2 MoO 3. MoO 2 has been reported as catalysing the dehydrogenation of alcohols, [6] the reformation of hydrocarbons [7] and ...
Heating ammonium orthomolybdate solid or treatment with acid gives molybdenum trioxide. Such reactions proceed via ammonium dimolybdate. This equilibrium is exploited in the purification of molybdenum from its ores. Aqueous solutions of ammonium orthomolybdate react with hydrogen sulfide to give ammonium tetrathiomolybdate:
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ADM is an intermediate in the production of molybdenum compounds from its ores. Roasting typical ore produces crude molybdenum(VI) oxides, which can be extracted into aqueous ammonia, affording ammonium molybdate. Heating solutions of ammonium molybdate gives ADM. Upon heating, solid ammonium dimolybdate decomposes to molybdenum trioxide: [1]
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