Silicotungstic acid or tungstosilicic acid is a heteropoly acid with the chemical formula H4[SiW12O40]. It forms hydrates H4[SiW12O40]·nH2O. In freshly...
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ethylene to acetic acid. The process is catalyzed by a palladium metal catalyst supported on a heteropoly acid such as silicotungstic acid. A similar process...
62 KB (6,534 words) - 17:38, 30 November 2024
illustrative large-scale conversions. Acrylic acid is generated from propene. Oxidation of ethene using silicotungstic acid catalyst. Base-catalyzed dehydrogenation...
26 KB (2,619 words) - 19:06, 3 December 2024
Ethyl acetate (redirect from Acid hydrolysis of ethyl acetate)
catalyst: 2 CH3CHO → CH3CO2CH2CH3 Silicotungstic acid is used to manufacture ethyl acetate by the alkylation of acetic acid by ethylene: C2H4 + CH3CO2H →...
21 KB (1,829 words) - 09:43, 26 September 2024
Ester (redirect from Carboxylic acid ester)
reaction of ethylene, acetic acid, and oxygen: 2 H2C=CH2 + 2 CH3CO2H + O2 → 2 CH3CO2CH=CH2 + 2 H2O Silicotungstic acid is used to manufacture ethyl acetate...
46 KB (4,846 words) - 04:43, 20 November 2024
and the silicotungstate. It also coprecipitates with silicotungstic acid, and with perchloric acid, without another alkali metal as a carrier, which leads...
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Heteropolymetalate (redirect from Wells-Dawson acid)
assay and EPTA, ethanolic phosphotungstic acid. Phosphomolybdic acid Phosphotungstic acid Silicotungstic acid Greenwood, N. N.; Earnshaw, A. (1997). Chemistry...
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decomposition. Tungstophosphoric acid is thermally stable up to 400 °C, and is more stable than the analogous silicotungstic acid, H4[SiW12O40]. Large quantities...
20 KB (2,141 words) - 01:11, 15 December 2023
Keggin structure (category Heteropoly acids)
compounds ideas of Copaux, attempted to explain the structure of silicotungstic acid. He assumed a central group, [SiO4]4− ion, enclosed by four [RW2O6]+...
13 KB (1,639 words) - 06:44, 23 July 2024
Brønsted acids are used when alkylating with olefins. Typical catalysts are zeolites, i.e. solid acid catalysts, and sulfuric acid. Silicotungstic acid is used...
15 KB (1,651 words) - 13:59, 24 August 2024
tungsten, and other elements. He prepared silicotungstic acid, one of the first examples of the complex inorganic acids. Marignac discovered that niobium and...
10 KB (946 words) - 13:34, 2 November 2024
and the silicotungstate. It also coprecipitates with silicotungstic acid, and with perchloric acid, without another alkali metal as a carrier, which leads...
37 KB (4,131 words) - 12:02, 5 December 2024
are also susceptible to hydration. The reaction usually involves strong acid as catalyst. The first step in hydration often involves formation of a carbocation...
48 KB (5,160 words) - 20:06, 22 December 2024