Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Silicotungstic acid or tungstosilicic acid is a heteropoly acid with the chemical formula H4[SiW12O40]. It forms hydrates H4[SiW12O40]·nH2O. In freshly prepared samples, n is approximately 29, but after prolonged desiccation, n = 6.[1] It is a white solid although impure samples appear yellow. It is used as a catalyst in the chemical industry.[2]
^Cite error: The named reference Dias was invoked but never defined (see the help page).
^Misono, Makoto (2009). "Recent progress in the practical applications of heteropolyacid and perovskite catalysts: Catalytic technology for the sustainable society". Catalysis Today. 144 (3–4): 285–291. doi:10.1016/j.cattod.2008.10.054.
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Silicotungsticacid or tungstosilicic acid is a heteropoly acid with the chemical formula H4[SiW12O40]. It forms hydrates H4[SiW12O40]·nH2O. In freshly...
ethylene to acetic acid. The process is catalyzed by a palladium metal catalyst supported on a heteropoly acid such as silicotungsticacid. A similar process...
catalyst: 2 CH3CHO → CH3CO2CH2CH3 Silicotungsticacid is used to manufacture ethyl acetate by the alkylation of acetic acid by ethylene: C2H4 + CH3CO2H →...
illustrative large-scale conversions. Acrylic acid is generated from propene. Oxidation of ethene using silicotungsticacid catalyst. Base-catalyzed dehydrogenation...
decomposition. Tungstophosphoric acid is thermally stable up to 400 °C, and is more stable than the analogous silicotungsticacid, H4[SiW12O40]. Large quantities...
and the silicotungstate. It also coprecipitates with silicotungsticacid, and with perchloric acid, without another alkali metal as a carrier, which leads...
compounds ideas of Copaux, attempted to explain the structure of silicotungsticacid. He assumed a central group, [SiO4]4− ion, enclosed by four [RW2O6]+...
and the silicotungstate. It also coprecipitates with silicotungsticacid, and with perchloric acid, without another alkali metal as a carrier, which leads...
Brønsted acids are used when alkylating with olefins. Typical catalysts are zeolites, i.e. solid acid catalysts, and sulfuric acid. Silicotungsticacid is used...
are also susceptible to hydration. The reaction usually involves strong acid as catalyst. The first step in hydration often involves formation of a carbocation...
tungsten, and other elements. He prepared silicotungsticacid, one of the first examples of the complex inorganic acids. Marignac discovered that niobium and...
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