Adsorption and thermodynamic study of pyrogenic alumina properties

Adsorption of n-pentane, triethylamine, diethyl ether, acetonitrile and chl oroform has been investigated on pyrogenic alumina (S=140 m(2) g(-1)). The results of our studies have shown the presence of active sites on the surfa ce of pyrogenic alumina with irreversible adsorption of electron-donating m olecules and CHCl3 and the dependence of energetic surface properties on el ectronic structure of adsorbate, quantity of adsorbed substance and hydrati on degree of the surface. On the hydrated oxide surface the water molecules screen the active sites of the surface, which resulted in changing of inte raction energy of adsorbent-adsorbate and decreasing the region of irrevers ible adsorption of organic bases and CH-acid.