Overview
Ammonium molybdate is an inorganic salt of molybdenum and ammonia, commonly encountered as the tetrahydrate form. It plays a vital role in various industrial processes due to its chemical properties. The compound is primarily manufactured by dissolving molybdenum trioxide in ammonia solution, followed by crystallization. Industrial production focuses on high-purity grades for catalyst manufacturing, while agricultural grades are used in micronutrient fertilizers. The global demand for ammonium molybdate has grown steadily with increasing applications in petroleum refining and metal surface treatment industries.
Physical and Chemical Properties
Ammonium molybdate tetrahydrate forms colorless monoclinic crystals that are stable under normal conditions but decompose upon heating, losing ammonia and water molecules. The compound shows excellent water solubility (43 g/100 mL at 20°C), forming slightly acidic solutions that contain various molybdate anions. As an oxidizing agent, it participates in redox reactions and forms complexes with many metals. The thermal decomposition produces molybdenum trioxide as the final product. The crystalline structure has been well-characterized, showing hydrogen bonding between ammonium ions and molybdate polyanions.
Main Applications
In the petroleum industry, ammonium molybdate serves as a precursor for hydrodesulfurization catalysts that remove sulfur from crude oil fractions. These catalysts typically contain molybdenum disulfide supported on alumina, with cobalt or nickel as promoters. The compound also finds use as a corrosion inhibitor in cooling water systems, where it forms protective films on metal surfaces. In agriculture, it provides essential molybdenum for legume crops, typically applied at rates of 0.5-2 kg per hectare. Other applications include analytical chemistry (phosphate determination), pigments (ceramics and paints), and electroplating solutions.
Safety and Storage
Ammonium molybdate requires careful handling due to its irritant properties. Workers should wear appropriate PPE including gloves, goggles, and dust masks to prevent skin contact and inhalation of powder. The compound is not highly toxic but may cause gastrointestinal distress if ingested. Storage areas should be dry and well-ventilated, with temperatures below 30°C to prevent decomposition. Keep containers tightly sealed to avoid moisture absorption. Incompatible materials include strong acids, reducing agents, and combustible substances. Spills should be contained and cleaned promptly with water.
B2B Procurement Guide
When sourcing ammonium molybdate in bulk quantities, buyers should specify the required purity level (typically 99% or higher for industrial applications). Technical grade suffices for most uses, while reagent grade commands premium pricing. Packaging options include 25 kg polyethylene-lined bags or fiber drums for larger orders. Quality verification should include certificate of analysis checking for MoO₃ content (minimum 81% for tetrahydrate), heavy metal impurities, and insoluble matter. Reliable suppliers will provide MSDS and technical support. Consider logistics factors as the material may be classified differently across regions for transport regulations.
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