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- W2018643548 abstract "The adsorption of MoxOyz− species from aqueous solutions on the surface of pure and Na+ or Li+-doped γ-aluminas was studied over a pH range between 3.0 and 8.5 and temperatures ranging from 10 to 55°C. The variations in pH with the concentrations of the impregnating solutions observed and analysis of the isotherms demonstrated that the following findings reported for adsorption on pure γ-alumina at T = 25°C and pH 5 are also valid for adsorption on pure and sodium-doped aluminas performed at various pH values and temperatures: (i) The contribution of precipitation to the deposition is negligible. (ii) The adsorption constant for the MoO42− ions is larger than those for the isopolyanions. (iii) The adsorbed MoxOyz− ions are located on energetically equivalent but distinct sites of the inner Helmholtz plane, created mainly by the protonated surface hydroxyls. (iv) Lateral interactions are exerted between the adsorbed MoxOyz− ions resulting in the formation of MoxOyz− … MoxOz− oligomers. Moreover, it was demonstrated that the regulation of the concentration of the protonated surface hydroxyls makes it possible to deposit by adsorption very large amounts of MoVI on the γ-alumina surface. Although the sodium doping was found to be the most attractive from the view point of maximization of the extent of adsorption, it may be suggested that it promotes the formation of the catalytically inert sodium molybdate. Therefore the second best method of regulation, namely the change in the impregnating temperature, may prove to be the most convenient in practice." @default.
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- W2018643548 date "1990-08-01" @default.
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- W2018643548 title "Molybdenum-oxo species deposited on alumina by adsorption II. Regulation of the Surface MoVI Concentration by Control of the protonated Surface Hydroxyls" @default.
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- W2018643548 doi "https://doi.org/10.1016/0021-9517(90)90180-r" @default.
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