Abstract
Adsorption isotherms of argon on anatase have been measured volumetrically at 76.91°K. and 89.39°K. and at equilibrium relative pressures ranging down into the 10 −7 range. At adsorption potentials greater than 2.2 × 10 3 the data at both temperatures fit the Dubinin-Radushkevich equation. The decrease φ in surface free energy due to adsorption was calculated with the aid of the Dubinin-Radushkevich expression in the very low relative pressure region; the values so obtained are considered more precise than those obtained by empirical extrapolation. The differential and integral thermodynamic adsorption functions have been calculated. At a surface coverage corresponding to about 12% of the BET monolayer a “pseudo-monolayer effect” is observed. There is a maximum in both enthalpy functions and a minimum in the entropy functions. The surface is considered as a composite with patches of high-energy sites.
Published Version
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