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- W2094537605 abstract "Photoacoustic spectroscopy (PAS) has been applied in the infrared region to the characterization of a number of heteropoly compounds which show interesting trends in activity and selectivity in the conversion of methanol to hydrocarbons. From direct studies of powdered catalyst samples, PAS has yielded information concerning the structure, stability, and acidity of 12-tungstophosphoric acid, H3PW12O40, and the respective Al3+, NH4+, and Na+ salts. Results of heating in vacuo indicate that the Keggin unit i.e., the PW12O403− ion, is stable apart from a small loss of O, up to 4̃50 °C, but the parent acid loses protons, beginning around 400 °C. Studies of the sorption of NH3 show that H3PW12O40 reacts quantitatively to form the NH4+ salt and reveal that the salts are nonstoichiometric, existing in partial (Brønsted) acid form. Evidence was found for Lewis acidity in the Al3+ salt, and attributed to the presence of the cations. A qualitative correlation of Brønsted acidity with activity is drawn." @default.
- W2094537605 created "2016-06-24" @default.
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- W2094537605 date "1984-07-01" @default.
- W2094537605 modified "2023-09-24" @default.
- W2094537605 title "Characterization of 12-tungstophosphoric acid and related salts using photoacoustic spectroscopy in the infrared region I. Thermal stability and interactions with ammonia" @default.
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- W2094537605 doi "https://doi.org/10.1016/0021-9517(84)90062-9" @default.
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