The Characteristic Curve in Physical Adsorption

Abstract

The concept of the characteristic curve in physical adsorption and the rule of its temperature invariance is traced from the potential theory of adsorption by Polanyi to the Frenkel–Halsey–Hill equation, the theory of volume filling of micropores by Dubinin et al. and the theory of adsorption on heterogeneous surfaces. A computer simulation of an irregular atomic configuration at the surface of amorphous carbon is presented. In the submonolayer region, the isotherms of argon adsorption simulated on that surface are shown to correspond to the Freundlich equation and are close to the experimental isotherms on a diamond dust sample. Simulated isosteric heats of adsorption are also reasonably close to the experimental data for argon on a real carbon black. The BET C constant for the simulated isotherm is lower than for the real isotherm on untreated carbon black. However, the isotherms at two temperatures can be described by one absolute isotherm of adsorption.

Get full access to this article

View all access options for this article.

References

Adams

D.J.

(1976) Mol. Phys. 32, 647.

Bakaev

V.A.

(1988) Surf. Sci. 198, 571.

Bakaev

V.A.

(1992) Surf. Sci. 264, L218.

Bakaev

V.A.

and Bottani

E.J.

(1993) Unpublished results.

Bakaev

V.A.

and Dubinin

M.M.

(1987) Dokl. Akad. Nauk SSSR 296, 369.

Bakaev

V.A.

and Steele

W.A.

(1992) Langmuir 8, 148.

Bakaev

V.A.

and Steele

W.A.

(1993) J. Chem. Phys. 98, 9922.

Bakaev

V.A.

, Dubinin

M.M.

and Korchagin

E.Ya

. (1977) Izv. Akad. Nauk SSSR, Ser. Khim. 1712.

Beebe

R.A.

and Young

D.M.

(1954) J. Phys. Chem. 58, 93.

10.

Bering

B.P.

, Dubinin

M.M.

and Serpinski

V.V.

(1972) J. Colloid Interface Sci. 38, 185.

11.

Brenner

D.W.

(1989) Atomic Scale Calculations in Materials Science Tersoff, J., Vanderbilt

, Vitek

, Eds, MRS, Pittsburg, PA.

12.

Brenner

D.W.

(1990) Phys. Rev. B 42, 9458.

13.

Bojan

M.J.

, Vernov

A.V.

and Steel

W.A.

(1992) Langmuir 8, 901.

14.

Brunauer

(1945) The Adsorption of Gases and Vapors Princeton University Press, Princeton, NJ.

15.

Cheng

and Cole

M.W.

(1989) Langmuir 5, 616.

16.

Cotton

F.A.

and Wilkinson

(1980) Advanced Inorganic Chemistry. A Comprehensive Text John Wiley & Sons, New York, p. 16.

17.

Dubinin

M.M.

(1960) Chem. Rev. 60, 235.

18.

Dubinin

M.M.

(1975) Progress in Surface and Membrane Science Cadenhead

D.A.

, Daniell

J.F.

, Rosenberg

M.D.

, Eds, Academic Press, New York, Vol. 9.

19.

Dubinin

M.M.

(1989) Carbon 27, 457.

20.

Dubinin

M.M.

and Radushkevich

L.V.

(1947) Proc. Acad. Sci. USSR 55, 331.

21.

Frauenheim

., Blaudeck

, Stephan

and Jungnickel

(1993) Phys. Rev. B 48, 4823.

22.

Goodwin

R.D.

(1988) J. Phys. Chem. Ref. Data 17, 1597.

23.

Graham

(1960) J. Phys. Chem. 64, 1089.

24.

Gregg

S.J.

and Sing

K.S.W.

(1982) Adsorption, Surface Area and Porosity Academic Press, London, Chap. 4.

25.

Jacobsen

R.T.

, Stewart

R.B.

and Jahangiri

(1986) J. Phys. Chem. Ref. Data 15, 795.

26.

Lopez-Gonzalez

J.D.

, Carpenter

F.G.

and Deitz

V.R.

(1961) J. Phys. Chem. 65, 1112.

27.

Polanyi

(1963) Science 141, 1010.

28.

Roberston

(1986) Adv. Phys. 35, 317.

29.

Rowlinson

J.S.

(1959) Liquids and Liquid Mixtures Butterworths, London, p. 15.

30.

Rowlinson

J.S.

and Widom

(1982) Molecular Theory of Capillarity Clarendon Press, Oxford.

31.

Rudzinski

and Everett

D.H.

(1992) Adsorption of Gases on Heterogeneous Surfaces Academic Press, London.

32.

Steele

W.A.

(1974) The Interaction of Gases with Solid Surfaces Pergamon Press, Oxford, p. 238.

33.

Steele

W.A.

(1980) J Colloid Interface Sci. 75, 13.

34.

Tersoff

(1988) Phys. Rev. Lett. 61, 2879.

35.

Young

D.M.

and Crowell

A.D.

(1962) Physical Adsorption of Gases Butterworths, London, Chap. 5 and 7.