heteropoly acid


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heteropoly acid

[‚hed·ə′räp·ə·lē ′as·əd]
(inorganic chemistry)
Complex acids of metals, whose specific gravity is greater than 4, with phosphoric acid; an example is phosphomolybdic acid.
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As an example, Showa Denko of Japan commercialized a process using palladium-based heteropoly acid catalysts for ethylene oxidation to acetic acid in 1997 [2].
Summary: TEHRAN (FNA)- Iranian researchers waterproofed building materials with very high efficiency by using the green and noncorrosive heteropoly acid catalyst.
Heteropoly acid is the general term for oxygen acid composed of heteroatomic and multiatomic molecules through an oxygen atom bridging ligand [12-14].
The most widely used and studied types of heteropoly acid are phosphotungstic acid and silicon tungstate [21].
Guo, Phosphotungstic Acid, Silicotungstic Acid and Silicon Tungsten-Cobalt Heteropoly Acid with Bovine Serum Albumin Interaction.
Chen, One-pot synthesis of 1-acetylpyrene over supported phosphotungstic heteropoly acid catalysts.
Lopez-Salinas, Study of acid-base properties of supported heteropoly acids in the reactions of secondary alcohols dehydration.
In recent years, new environmentally friendly green catalysts such as heteropoly acids and their salts have attracted much attention [20, 21].
The difference in the acid strength between heteropoly acids and typical inorganic acids can be due to the fact that heteropoly anions are large anions bearing high negative charge density than inorganic acids.
Effects of different reaction parameters on the acetylation of alcohols with acetic acid catalyzed by other heteropoly acids were also investigated.
Folin-Ciocalteu reagent consists of a yellow acidic solution containing complex polymeric ions formed from phosphomolybdic and phosphotungstic heteropoly acids [19].
The reagent oxidizes the phenolates and reduces the heteropoly acids, turning the sample blue.