Abstract
The micropore-filling characteristics of a series of natural and modified microporous clinoptilolite-type zeolites with N2 at 76 K are measured and analysed. The adsorption behaviour of these substrata is examined in the range of relative pressures between 10−5–1. Several methods such as: Sing's αs-plots, de Boer's t-plots, Lee and Newnham's direct comparison plots, Dubinin's classical methods and a difference isotherm procedure proposed here, are used to assess the microporosity of the samples. Natural samples are used as reference materials to perform these sorption analyses of the modified samples. The effect of narrow micropore constrictions on the adsorption behaviour of clinoptilolites is explored experimentally. The occurrence of a low-pressure hysteresis loop along the sorption isotherm of a modified sample is frequently found and may be due to the strong adsorption of adsorbate molecules at the entrance of necked micropores that interfere with the diffusion of adsorbate molecules inside the porous structure of these zeolites.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. Jaroniec and K. Kaneko, Langmuir 13, 6589 (1997).
K.S.W. Sing, D.H. Everett, R.A.W. Haul, L. Moscou, R.A. Pierotti, J. Rouquerol, and T. Siemieniewska, Pure Appl. Chem. 57, 603 (1985).
K.S.W. Sing, in Principles and Applications of Pore Structural Characterization, edited by J.M. Haynes and P. Rossi-Doria (J. W. Arrowsmith Ltd., Bristol, 1985), p. 1.
K. Kaneko, in Equilibria and Dynamics of Gas Adsorption on Heterogeneous Solids Surfaces, edited by W. Rudzinski, W.A. Steele, and G. Zgrablich (Elsevier, Amsterdam, 1997), p. 679.
R.A. Roberts, K.S.W. Sing, and V. Tripathi, Langmuir 3, 331 (1987).
M.M. Dubinin, in Progress in Surface and Membrane Science, edited by J.F. Danielli, M.D. Rosenberg, and D.A. Cadenhead (Academic Press, London, 1975), Vol. 9, p. 1.
D. Atkinson, A.I. McLeod, and K.S.W. Sing, J. Chem. Phys. 81, 791 (1984).
D.H. Everett, in Characterization of Porous Solids I, edited by K.K. Unger, J. Rouquerol, K.S.W. Sing, and H. Kral (Elsevier, Amsterdam, 1988), p. 1.
J.M. Newsam and M.W. Deem, J. Phys. Chem. 99, 14903 (1995).
C.L. Cavalcante, J.S. Brandani, and D.M. Ruthven, Zeolites 18, 282 (1997).
P. Voogd, J.J.F. Sholten, J.J.F., and H. van Bekkum, Colloids Surf. 55, 163 (1991).
M.W. Ackley, R.F. Giese, and R.T. Yang, Zeolites 12, 781 (1992).
H.K. Shettna and S.K. Bathia, Langmuir 10, 870 (1994).
W.W. Steven and W.C. Conner, in Characterization of Porous Solids II, edited by F. Rodriguez-Reinoso, J. Rouquerol, K.S.W. Sing, and K.K. Unger (Elsevier, Amsterdam, 1991), p. 31.
E. Maglara, R. Kaminsky, and W.C. Conner, in Characterization of Porous Solids IV, edited by B. McEnaney, T.J. Mays, J. Rouquerol, F. Rodriguez-Reinoso, K.S.W. Sing, and K.K. Unger (Elsevier, Amsterdam, 1997), p. 25.
A.V. Vernov and W.A. Steele, Langmuir 2, 219 (1986).
G.V. Tsitsihvili, T.G. Andronikashvili, G.N. Kirov, and L.D. Filizova, Natural Zeolites (Ellis Horwood Ltd., Sussex, 1992), p. 100.
M.J. Remy and G. Poncelet, J. Phys. Chem. 99, 773 (1995).
K.S.W. Sing, in Surface Area Determination, edited by D.H. Everett and R.H. Ottewill (Butterworths, London, 1970), p. 25.
J.H. de Boer, B.J. Linsen, and T.J. Osinga, J. Catal. 4, 643 (1964).
J.A. Lee and C.E. Newnham, J. Colloid Interface Sci. 56, 391 (1976).
S.J. Gregg and K.S.W. Sing, Adsorption, Surface Area and Porosiy (Academic Press. New York, 1982), p. 93.
R.M. Barrer and M.B. Makki, Canad. J. Chem. 42, 1481 (1964).
M.M.J. Treacy, J.B. Higgins, and R. von Ballmoos, Zeolites 16, 478 (1996).
S. Yamanaka, P.B. Malla, and S. Komarneni, Zeolites 9, 18 (1989).
G. Amaresekera, M.J. Scarlett, and D.E. Mainwaring, J. Phys. Chem. 100, 7580 (1996).
D. Atkinson, A.I. Mcleod, and K.S.W. Sing, J. Chim. Phys. 81, 791 (1984).
P.J.M. Carrot, R.A. Roberts, and K.S.W. Sing, Carbon 25, 59 (1987).
Y. Hong and J.J. Fripiat, Microporous Materials 4, 323 (1995).
A.P. Carvalho, M. Brotas de Carvalho, and J. Pires, Zeolites 19, 382 (1997).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hernández, M., Rojas, F. & Lara, V. Nitrogen-Sorption Characterization of the Microporous Structure of Clinoptilolite-Type Zeolites. Journal of Porous Materials 7, 443–454 (2000). https://doi.org/10.1023/A:1009662408173
Issue Date:
DOI: https://doi.org/10.1023/A:1009662408173