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- W1966129969 abstract "An equilibrium adsorption technique was used to prepare WO3TiO2 and WO3Al2O3 samples. The tungsten loading could be controlled by varying the pH and concentration of the aqueous solutions. For both supports there was a definite maximum to the amount of tungsten that adsorbed spontaneously, viz. 988 ± 21 and 669 ± 19 μmol per 100 m2 for alumina and titania, respectively. The hydroxyl group to tungsten ratio was 2:1 on alumina for a fully hydroxylated surface. On titania the ratio was 1:1, based on the reacting hydroxyl group density. These stoichiometries point to a very specific interaction between the tungstate ions and the hydroxyl groups on the support surface during adsorption. Unlike on alumina, the reduction of tungsten oxide on titania (anatase) takes place in two well-separated steps viz., W6+ → W4+ → W0. During reduction the titania is transformed from anatase to rutile which has the same crystal structure and metal to oxygen bond length as WO2 and can thus facilitate and stabilize the W4+ ions. A stepwise reduction of tungsten oxide was not observed on alumina, probably due to the inability of alumina to stabilize the intermediate oxidation states of tungsten." @default.
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- W1966129969 date "1989-04-01" @default.
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- W1966129969 title "The preparation of WO3/TiO2 and Wo3/Al2O3 and characterization by temperature-programmed reduction" @default.
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- W1966129969 doi "https://doi.org/10.1016/0021-9517(89)90098-5" @default.
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