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- W1566850554 abstract "The ammonium salt of the 1-vanado-11-molybdophosphate in which vanadium is at the oxidation state IV was synthesized in order to obtain the mixed ammonium–cesium and pure cesium salts by thermal Cs+/NH4+ solid state exchange. Study of its thermal behavior showed that a phase, named phase A, isotype with the cubic phase of (NH4)3[PMo12O40] is obtained and is stable up to 410°C. This phase A contains two different Keggin heteropolyanions, [PMo11VIVO40]5− and [PMo12O40]3− in equal quantities and, in addition to the ammonium cations, vanadyl cations balance the supplementary negative charges of the vanadium containing heteropolyanion. Its molecular composition is (NH4)6(VO)[PMo11VIVO40][PMo12O40]. This phase has a low surface area (11 m2/g), on the contrary of the ammonium cubic phase of (NH4)3[PMo12O40] obtained by precipitation from aqueous solutions of the heteropolyacid. But it is about twice more active in the oxidative dehydrogenation of isobutyric acid and more selective to methacrylic acid, as it is expected from previous studies on vanadyl salts. Thermal Cs+/NH4+ exchanges performed on the phase A are not complete and cannot be carried out without structural modifications." @default.
- W1566850554 created "2016-06-24" @default.
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- W1566850554 date "2000-05-01" @default.
- W1566850554 modified "2023-09-27" @default.
- W1566850554 title "Study of ammonium, mixed ammonium–cesium and cesium salts derived from (NH4)5[PMo11VIVO40] as isobutyric acid oxidation catalysts" @default.
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- W1566850554 doi "https://doi.org/10.1016/s0926-860x(99)00522-0" @default.
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