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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PCL that was obtained by the ring-opening polymerization of [epsilon]-caprolactone using enzymatic, organic, metal catalyst systems [19], clay [20], heteropolyacid [21], and hydrated lanthanide halides in the presence of a microwave condition [22].
According to GreenMantra's patent, "the catalyst is prepared by binding a ferrous-copper complex to an alumina support and reacting it with heteropolyacid to obtain the final catalyst.
SDK's production process technology, which uses a solid heteropolyacid catalyst developed by SDK, adds ethylene directly to acetic acid, enabling efficient production of high-quality ethyl acetate, the company explained.
The new process technology uses a solid heteropolyacid catalyst developed by SDK.
04 mol/L solutions of the heteropolyacid in a methanol-chloroform mixture (1:1, by volume) were used for the investigation of the interaction between the polymer and the heteropolyacid.
Most methods of phosphorus determination are based on the reaction of P with an acidified molybdate reagent to yield a phosphomolybdate heteropolyacid, which is then reduced to an intensely-coloured blue compound and determined spectrophotometrically (Murphy & Riley, 1962; McKelvie et al.
Yadav and Mehta (1994) also proved that Amberlyst 15 was more active than sulphated zirconia, heteropolyacid and concentrated sulphuric acid.
SDK) has received the Chemical Society of Japan (CSJ) Award for Technical Development for 2007 for the company's development of ethyl acetate/acetic acid manufacturing processes using solid heteropolyacid catalysts.
Alternatives such as cationic exchangers like heteropolyacids supported on carbon [3], Si[O.
Heteropolyacids (HPAs) are one of the most attractive inorganic modifiers because these inorganic materials in crystalline form have been demonstrated to be highly conductive and thermally stable.
Research on properties and structures of phosphorus-containing heteropolyacids have created an opportunity for their use as catalysts, ion-exchangers, and also compounds for preparative and analytical chemistry (1-4).
Emerging opportunities afforded through molecular design of solid catalysts such as heteropolyacids are discussed by M.