Heteropoly acid

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A heteropoly acid is a chemical compound composed of:

• a metal such as tungsten, molybdenum or vanadium;
• oxygen;
• an element from the p-block of the periodic table, such as silicon, phosphorus or arsenic;
• acidic hydrogen atoms.

The conjugate anion of a heteropoly acid is known as a polyoxometallate.

Heteropoly acids are widely used as heterogeneous catalysts.

[edit] See also

• Tungstosilicic acid
• Molybdosilicic acid
• Phosphotungstic acid