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• W2000524598 abstract "Phosphoric acid was adsorbed on SiO2/ZrO2 mixed oxides prepared by a sol–gel processing method. The obtained composites, SiO2/ZrO2/phosphate with variable compositions, are very porous, having specific surface areas between 400 and 650 m2 g−1 and average pore volumes between 0.29 and 0.38 cm3 g−1. The binding energy P2p=134.5 eV and the atomic ratio P/Zr ∼ 2, both determined by the X-ray photoelectron spectroscopy technique, and corroborated by the 31P high power decoupling magic angle spinning and NMR techniques indicated that H2PO4− is the species present in the composites. The materials are all thermally very stable, and the phosphate entities show little thermal mobility. Under heat treatment up to 1273 K, the SiO2/ZrO2/phosphate samples did not show any phase transition corresponding to the transformation of phosphate to the pyrophosphate species. Large proton exchange capacities, between 1.22 and 2.90 mmol g−1, were obtained. Ammonia gas was rapidly adsorbed by the materials with the formation of NH4+ on the solid surface; thermodesorption occurred above 949 K." @default.
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• W2000524598 date "2000-09-01" @default.
• W2000524598 modified "2023-10-11" @default.
• W2000524598 title "Silica–zirconia–phosphate composites: a study of their synthesis, proton exchange capacity and ammonia gas adsorption" @default.
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• W2000524598 doi "https://doi.org/10.1016/s1387-1811(00)00176-1" @default.
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