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- W1567506342 abstract "The equilibrium adsorption of phosphomolybdates on alumina was studied. Aqueous solutions ofheptamolybdate and phosphoric acid at a P/Mo molar ratio of 0.4 and solutions of phosphomolybdic acid (H3PMo12O40) in water, ethanol-water and dimethylformamide, were used. The adsorption isotherm of molybdenum from P2Mo5O236−had two plateau while that obtained with PMo12O403− exhibited only one plateau, thus showing the adsorption of two and only one species, respectively. The study of solutions by NMR and of solids by DRS indicated decomposition of P2Mo5O236− after contacting the alumina, while the PMo12O403− undergoes partial degradation in water and maintains its structure in the other solvents. The presence of MoO3 crystals was detected by XRD only for calcined samples from the adsorption isotherm of P2Mo5O236−. The PMoNi/Al2O3 catalysts were prepared by pore-filling impregnation of alumina spheres by adding both Mo and P first and then Ni. The Mo and P profiles showed that the concentration continuously diminishes from the surface to the center of the sphere whereas egg shell profiles were obtained for phosphomolybdic acid in dimethylformamide. The hydrodenitrogenation activity of catalysts was comparable to that of a commercial one. Catalysts obtained with the first two solutions were more active than a catalyst without phosphorus, while catalysts prepared with phosphomolybdic acid in organic solvents gave lower activities in the pyridine test reaction." @default.
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- W1567506342 date "1995-01-01" @default.
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- W1567506342 title "Preparation of PMoNi/λ-Al2O3 catalysts from solutions of phosphomolybdates in water, ethanol-water and dimethylformamide" @default.
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- W1567506342 doi "https://doi.org/10.1016/s0167-2991(06)81856-2" @default.
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