Applications of Quantitative Thermal Analysis to Molecular Sieve Zeolites

  • W. H. Flank

Abstract

Molecular sieve zeolites are a class of stable mineral and synthetic crystalline inorganic compounds characterized by the presence of an open oxide framework structure. This open structure gives rise to a regular network of uniform pores of molecular dimensions that pervades the crystal. The open framework is generally an aluminosilicate one, in which the aluminum and silicon atoms are tetrahedrally coordinated to oxygen atoms in a continuous array. However, they form subunits of rings and cages that can be linked together in a variety of ways to provide, after suitable activation, channels and cavities of predetermined size regularly disposed throughout the crystal. The charge deficiency resulting from the tetrahedral coordination of the aluminum atoms is balanced by the presence of cations positioned by electrostatic forces at relatively fixed locations in the channels and cavities. These charge-balancing cations, however, are not an integral part of the oxide framework. They are, in fact, generally ion-exchangeable by other cations with varying degrees of ease depending on the nature of the cations involved, the conditions under which the exchange is carried out and the location of the various types of ion exchange sites in the structural network, among other things.

Keywords

Aluminum Atom Rare Earth Cation Unit Cell Size Bronsted Acid Site Union Carbide Corporation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. (1).
    D. W. Breck, “Zeolite Molecular Sieves”, Wiley-Interscience, N.Y., 1974.Google Scholar
  2. (2).
    R. M. Barrer and D. A. Langley, J. Chem. Soc., 3804 (1958).Google Scholar
  3. (3).
    ibid, 3811 (1958).Google Scholar
  4. (4).
    P. B. Venuto, E. L. Wu and J. Cattanach, Anal. Chem., 38:1266 (1966).CrossRefGoogle Scholar
  5. (5).
    H. W. Habgood, Can. J. Chem., 42:2340 (1964).CrossRefGoogle Scholar
  6. (6).
    J. L. Carter et al., J. phys. Chem., 70:1126 (1966)CrossRefGoogle Scholar
  7. (7).
    H. C. Tuang, B. V. Romanovskii, K. V. Topchieva and L. I. Piguzova, Kinetics and Catalysis (transi.), 8:594 (1967).Google Scholar
  8. (8).
    J. E. Benson, K. Ushiba and M. Boudart, J. Catal., 9:91 (1967).CrossRefGoogle Scholar
  9. (9).
    W. J. Ambs and W. H. Flank, J. Catal., 14:118 (1969).CrossRefGoogle Scholar
  10. (10).
    G. T. Kerr, J. Catal., 15:200 (1969).CrossRefGoogle Scholar
  11. (11).
    J. Cattanach, E. L. Wu and P. B. Venuto, J. Catal., 11:342 (1968).CrossRefGoogle Scholar
  12. (12).
    J. Scherzer and J. L. Bass, J. Catal., 28:101 (1973).CrossRefGoogle Scholar
  13. (13).
    J. W. Ward, J. Catal., 27:157 (1972).CrossRefGoogle Scholar
  14. (14).
    R. G. Milkey, Amer. Mineral., 45:990 (1960).Google Scholar
  15. (15).
    A. P. Bolton and M. A. Lanewala, J. Catal., 18:154 (1970).CrossRefGoogle Scholar
  16. (16).
    A. P. Bolton, J. Catal., 22:9 (1971).CrossRefGoogle Scholar
  17. (17).
    H. Bremer, W. Morke, R. Schodel and F. Vogt, in “Molecular Sieves”, Advan. Chem. Ser., Vol. 121, American Chemical Society, Washington, D.C., 1973, p. 249.CrossRefGoogle Scholar
  18. (18).
    D. A. Hickson and S. M. Csicsery, J. Catal., 10:27 (1968).CrossRefGoogle Scholar
  19. (19).
    G. T. Kerr, in “Molecular Sieves”, Advan. Chem. Ser., Vol. 121, American Chemical Society, Washington, D.C, 1973, p. 219.CrossRefGoogle Scholar
  20. (20).
    J. J. Behen and H. F. Hillery, unpublished data.Google Scholar
  21. (21).
    A. P. Bolton and R. L. Bujalski, J. Catal., 23:331 (1971).CrossRefGoogle Scholar
  22. (22).
    K. Tsutsumi and H. Takahashi, J. Catal., 24:1 (1972).CrossRefGoogle Scholar
  23. (23).
    W. H. Flank, unpublished work.Google Scholar
  24. (24).
    H. F. Hillery and R. L. Bujalski, unpublished data.Google Scholar
  25. (25).
    W. H. Flank, J. Thermal Anal., 3:73 (1971).CrossRefGoogle Scholar
  26. (26).
    G. H. Kuhl, J. Catal., 29:270 (1973).CrossRefGoogle Scholar
  27. (27).
    E. M. Flanigen, H. A. Szymanski and H. Khatami, in “Molecular Sieve Zeolites”, Advan. Chem. Ser., Vol. 101, American Chemical Society, Washington, D. C., 1971, p. 201.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • W. H. Flank
    • 1
  1. 1.Union Carbide CorporationNew YorkUSA

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