Influence of Fluoride Anions on the Acid-Base Properties of Mg/Al Mixed Oxides

Mg/Al mixed oxides derived from layered double hydroxide precursors were modified with fluoride anions to probe their influence on acid-base and catalytic properties. Fluoride anions were incorporated by treatment were analyzed by XRD, Al-27 NMR, F-19 MAS NMR, The modification of Mg/Al mixed oxides led to the incorporation of fluoride anions in various configurations. Overall, the concentration of acid sites was enhanced by this modification while it decreased the concentration of the basic sites. The rate of dehydrogenation of propan-2-ol drastically increased in the presence of F- anions, but the rate of dehydration was hardly influenced. This indicates that the fluoride anions improve the ability of the mixed oxides to abstract protons from polar molecules without increasing the overall base strength of the mixed oxide.     «

Mg/Al mixed oxides derived from layered double hydroxide precursors were modified with fluoride anions to probe their influence on acid-base and catalytic properties. Fluoride anions were incorporated by treatment were analyzed by XRD, Al-27 NMR, F-19 MAS NMR, The modification of Mg/Al mixed oxides led to the incorporation of fluoride anions in various configurations. Overall, the concentration of acid sites was enhanced by this modification while it decreased the concentration of the basic site...     »