CAS 12054-85-2 Ammonium Molybdates Tetrahydrate Source Of Molybdenum In Catalysts

Description

Ammonium molybdates tetrahydrate is an inorganic salt with the chemical formula (NH₄)₆Mo₇O₂₄·4H₂O. It typically appears as white or slightly greenish-yellow crystalline powder or small lumps. It is one of the most common and commercially important molybdenum compounds, serving as a primary source of molybdenum in catalysts, fertilizers, and analytical chemistry. It is soluble in water but insoluble in most organic solvents.

Specification  

Features & Properties

• High-Purity Source of Molybdenum: Provides molybdenum in a soluble, readily available form for industrial and laboratory processes.
• Oxidizing Agent: Used in analytical chemistry for the detection and quantification of phosphates, silicates, and arsenates.
• Thermal Decomposition: Upon strong heating, it decomposes to molybdenum trioxide (MoO₃), a key intermediate.
• Acidic in Solution: Forms slightly acidic solutions and can act as a catalyst precursor in acid-catalyzed reactions.
• Hygroscopic: Can absorb moisture from the air, requiring proper storage.

Applications

1. Analytical Chemistry:

   • Phosphate Determination: A key component in the classic "Molybdenum Blue" method for colorimetric phosphate analysis in water, soil, and biological samples.
   • Test Reagent: For detecting and quantifying silicates, arsenates, lead, and other elements.

2. Catalysts & Catalysis:

   • Precursor: For preparing hydrodesulfurization (HDS) and hydrotreatment catalysts used in petroleum refining to remove sulfur.
   • Oxidation Catalysts: Used in the manufacture of catalysts for the oxidation of propylene to acrolein/acrylic acid.

3. Agriculture:

   • Micronutrient Fertilizer: Source of the essential trace element molybdenum for leguminous crops (e.g., peas, beans, alfalfa) to support nitrogen fixation.

4. Corrosion Inhibition:

   • Used as an anodic corrosion inhibitor in cooling water systems and antifreeze formulations.

5. Pigments & Ceramics:

   • A starting material for producing molybdates pigments (e.g., zinc molybdates, calcium molybdates) which are corrosion-inhibiting pigments in paints.
   • Used in the production of ceramic glazes and frits.

6. Electroplating:

   • Source of molybdenum for electrodeposition of molybdenum alloys.

Packing 25 kg PE bags lined with a moisture barrier,