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• W2018751443 abstract "Two series of carriers were prepared by doping γ-Al2O3 with various amounts of Li+ and F− ions and the point of zero charge (ZPC), the surface acidity constants as well as the concentration of the charged surface groups, AlOH2+ and AlO− were determined potentiometrically over a wide pH range. It was found that 0.621 mmol Li+ per g of γ-Al2O3 were sufficient to cause a shift of the ZPC from 5.30 to 9.80. Accordingly, the concentration of adsorption sites for negative species (AlOH2+) was increased, while the surface acidity constants decreased and the formation of AlO− sites was inhibited. Further increase in the lithium content causes a marked increase in the concentration of the AlOH+2 groups at pH lower than 8.0. Comparison of the effects caused due to the lithium doping with those observed after sodium modification studied previously, showed that lithium can be used instead of sodium in the cases where the latter causes catalytic deactivation. However, larger amounts of lithium, as compared with that of sodium, are necessary in order for the same increase in the concentration of the AlOH2+ groups at a given pH to be achieved. A mechanism similar to that adopted for the sodium-doped alumina has been used to explain the Li+ effects observed in the present study. Concerning the doping by F− ions it was observed that modification of γ-Al2O3 with 0.125 mmol F− per g of γ-Al2O3 decreases the ZPC from 5.30 to 3.40. F− doping thus can be used to extend the pH range, where positive species could be deposited on γ-Al2O3 by adsorption, at lower pH values. Moreover, this modification brings about an increase in the concentration of the adsorption sites for positive species, AlO−, as well as in the values of the surface acidity constants. Additional increase in the concentration of the F− ions provokes a considerable increase in the concentration of the AlO− groups at pH higher than 3.40 though it does not further affect the values of ZPC and surface acidity constants." @default.
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• W2018751443 date "1986-09-01" @default.
• W2018751443 modified "2023-10-16" @default.
• W2018751443 title "Development of carriers with controlled concentration of charged surface groups in aqueous solutions II. Modification of $gamma;-Al2O3 with various amounts of lithium and fluoride ions" @default.
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• W2018751443 doi "https://doi.org/10.1016/0021-9517(86)90242-3" @default.
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