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Ammonium Tetramolybdate Dihydrate is a white crystalline powder with a chemical formula of Mo4O13.2H4N. Ammonium Tetramolybdate is slightly soluble in water, alkali, and ammonia and insoluble in alcohol. It is often used to produce hydrogenation, desulfurization, and other petroleum refining catalysts, trace element fertilizers, and raw materials for manufacturing ceramic colorants, pigments, and other molybdenum compounds.