Adsorption of vapors of argon, nitrogen, n-hexane, and benzene on boron nitride and molybdenum sulfide

Abstract

1. The values of the adsorption of argon vapor per unit surface of adsorbents of different kinds differ sharply, since in this case only electrokinetic (dispersion) interactions are manifested, which depend basically upon the concentration, dimensions, and polarizability of the atoms on the surface of the adsorbent. The values of the adsorption of nitrogen vapor on adsorbents of different kinds are closer. An analogous picture is obtained for adsorption of n-hexane and benzene on these adsorbents. This is due to the fact that in the adsorption of nitrogen and benzene molecules, possessing a π-bond with peripheral concentration of the electron density on polar adsorbents a supplementary, more specific interaction of the protonated hydroxyl groups and cations of the surface with the π-bonds of the adsorbed molecules is manifested. 2. The adsorption of n-hexane vapor on nonpolar surfaces of BN and MoS2 is substantially greater than the adsorption of benzene vapor within practically the entire investigated region of relative pressures. 3. The samples of BN and MoS2 occupy an intermediate position between graphitized carbon black and magnesium oxide, in adsorption capacity with respect to n-hexane.