Ammonium tetramolybdate, also known as ammonium molybdate or (NH4)4Mo7O24, is an important chemical compound with various applications. Here are some common uses of ammonium tetramolybdate:

1. Catalyst: Ammonium tetramolybdate is used as a catalyst in a wide range of chemical reactions, including oxidation, dehydrogenation, and desulfurization processes. It is particularly useful in petroleum refining and the production of various organic compounds.

2. Corrosion inhibitor: It is employed as a corrosion inhibitor for metals, such as steel and aluminum. Ammonium tetramolybdate forms a protective layer on the metal surface, preventing corrosion and extending the lifespan of the material.

3. Pigment and dye production: Ammonium tetramolybdate is utilized in the production of pigments and dyes, especially in the synthesis of yellow and orange pigments.

4. Fertilizer additive: It is sometimes used as a micronutrient additive in fertilizers, primarily for crops that require molybdenum supplementation. Molybdenum is an essential trace element for plants, and ammonium tetramolybdate provides a source of soluble molybdenum for agricultural use.

5. Molybdenum source: Ammonium tetramolybdate is a common source of molybdenum compounds used in the production of molybdenum metal, alloys, and other molybdenum-containing materials. These materials find applications in industries such as aerospace, electronics, and steel manufacturing.

6. Laboratory reagent: Due to its properties, ammonium tetramolybdate is employed as a reagent in various laboratory analyses and tests. It is used for detecting and quantifying phosphates, silicates, arsenates, and other substances in water, soil, and biological samples.

7. Electroplating: Ammonium tetramolybdate is utilized in the electroplating industry as a molybdenum source for depositing thin, adherent molybdenum coatings on various substrates, such as metal components or electronic devices.