Effect of silica surface dehydroxylation on adsorption of aromatic hydrocarbons from solution in n-alkanes

Abstract

The adsorption of a series of aromatic hydrocarbons from solution in saturated hydrocarbons on hydroxylated and dehydroxylated silica surface has been investigated. Dehydroxylation of silica surface sharply diminishes the adsorption of aromatic hydrocarbons. Since the molecules of aromatic hydrocarbons on the hydroxylated silica are oriented parallel to the surface, the influence on adsorption of the size of molecules at the same orientation was investigated and distribution functions for several systems were determined. The equilibrium constants and the activity coefficients of surface benzene + n-hexane phases on hydroxylated and dehydroxylated silica and on graphitized carbon black surfaces have been calculated.