|Molar mass||2878.2 g/mol|
|EU Index||Not listed|
|Related heteropoly acids||Phosphotungstic acid|
|Related compounds||Tungsten trioxide
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Silicotungstic acid (also known as tungstosilicic acid) is the most commonly encountered heteropoly acid. It is a pale yellow solid with the chemical formula H4[W12SiO40]. It is used as a catalyst in the chemical industry.
- C2H4 + CH3CO2H → CH3CO2C2H5
It has also been commercialized for the oxidation of ethylene to acetic acid:
- C2H4 + O2 → CH3CO2H
Synthesis and structure
The free acid is produced by combining sodium silicate and tungsten trioxide followed treatment of the mixture with hydrochloric acid. The polyoxo cluster adopts a Keggin structure, with Td point group symmetry.
- Misono, Makoto "Recent progress in the practical applications of heteropolyacid and perovskite catalysts: Catalytic technology for the sustainable society" Catalysis Today 2009, vol. 144, pp. 285-291. http://dx.doi.org/10.1016/j.cattod.2008.10.054
- Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY.
|This inorganic compound-related article is a stub. You can help Wikipedia by expanding it.|