The chemical interaction of cumene with the OH groups of silicaalumina has been studied by chemisorption and by molecular orbital calculations. It has been found that the surface of the silica-alumina is heterogeneous for the adsorption of cumene, and the Freundlich model fits the experimental results reasonably well. During the interaction of a cumene molecule with a Brönsted acid site, the protonation channels direct the attack to the para position, while for distances between 2 and 3Åthe interaction becomes delocalized along the benzene ring. Finally, it is suggested that a very low percentage of the total amount of acid sites are responsible for the activation of cumene molecules.
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