Adsorption of alcohols on silica — evidence for the existence of aprotonic adsorption sites

  • H. Knözinger
  • W. Stählin
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 67)


The adsorption of tertiary butanol, 2,2,4-trimethylpentan-3-ol, and of di-isopropylether on silicas of different hydroxyl group densities has been studied by gravimetry and infrared spectroscopy. The adsorption of these molecules is entirely reversible. Isosteric heats and entropies of adsorption as well as infrared results suggest a rather complex and unusual adsorption behaviour, in which H-bonding between silanol groups as H-bond donors and adsorbate molecules as H-bond acceptors as well as a coordinative adsorption are being involved. The coordination sites are identified as “strained” siloxane bridges which are assumed to be reversibly opened under the action of the adsorbate at sufficiently high temperatures and pressures. The coordinated species are being considered as precursor states for the dissociative chemisorption under more severe conditions.


Isosteric Heat Dissociative Chemisorption Tertiary Butanol Siloxane Bridge Theoretical Monolayer 
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  1. 1).
    Boehm, H. P., Adv. Catalysis Relat. Subj. 16, 179 (1996).CrossRefGoogle Scholar
  2. 2).
    Knözinger, H., in: The Hydrogen Bond, P. Schuster, G. Zundel, and C. Sandorfy, Eds., Vol. 3, p. 1263, North Holland Publ. Comp. (Amsterdam 1976).Google Scholar
  3. 3).
    Gurthoys, G., V. Ya. Davydov, A. V. Kiselev, F. A. Kiselev, and B. V. Kuznetsov, J. Colloid Interf. Sci. 48, 58 (1974).CrossRefGoogle Scholar
  4. 4).
    Sidorov, A. N., Zh. Fiz. Khim. 30, 955 (1956).Google Scholar
  5. 5).
    Egorov, M. M., Kolloid & Z. Polym. 212, 126 (1966).CrossRefGoogle Scholar
  6. 6).
    Sidorov, A. N., Optik. Spektrosk. 8, 806 (1960).Google Scholar
  7. 7).
    Kubelkova, L., Collect. Czech. Chem. Commun. 37, 2853 (1972).Google Scholar
  8. 8).
    Kiselev, A.V., Disc. Faraday Soc. 52, 14 (1971).CrossRefGoogle Scholar
  9. 9).
    Kunavicz, J., P. Jones, and J. A. Hockey, Trans. Faraday Soc. 67, 848 (1971).CrossRefGoogle Scholar
  10. 10).
    Peglar, R. J., F. H. Hambleton, and J. A. Hockey, J. Catal. 20, 309 (1971).CrossRefGoogle Scholar
  11. 11).
    Borello, E., A. Zecchina, and C. Mdorterra, J. Phys. Chem. 71, 2938, 2945 (1967).CrossRefGoogle Scholar
  12. 12).
    Clark-Monks, C. and B. Ellis, J. Colloid. Interf. Sci. 44, 37 (1973).CrossRefGoogle Scholar
  13. 13).
    Boccuzzi, F., S. Coluccia, G. Ghiotti, C. Morterra, and A. Zecchina, J. Phys. Chem. 82, 1298 (1978).CrossRefGoogle Scholar
  14. 14).
    Morrow, B. A. and A. Devi, JCS Faraday I 68, 403 (1972).CrossRefGoogle Scholar
  15. 15).
    Morrow, B. A. and A. Devi, Chem. Commun. 1237 (1971).Google Scholar
  16. 16).
    Morrow, B. A. and I. A. Cody, J. Phys. Chem. 7, 1465 (1973).CrossRefGoogle Scholar
  17. 17).
    Morrow, B. A. and P. Ramamurthy, J. Phys. Chem. 77, 3052 (1973).CrossRefGoogle Scholar
  18. 18).
    Morrow, B. A., JCS Faraday I 170, 1527 (1974).CrossRefGoogle Scholar
  19. 19).
    Morrow, B. A. and I. A. Cody, JcS Faraday I 71, 1021 (1975).CrossRefGoogle Scholar
  20. 20).
    Morrow, B. A. and I. A. Cody, J. Phys. Chem. 79, 761 (1975).CrossRefGoogle Scholar
  21. 21).
    Morrow, B. A., I. A. Cody, and L. S. M. Lee, J. Phys. Chem. 79, 2405 (1975).CrossRefGoogle Scholar
  22. 22).
    Morrow, B. A. and I. A. Cody, J. Phys. Chem. 80, 1995 (1976).CrossRefGoogle Scholar
  23. 23).
    Morrow, B. A. and I. A. Cody, J. Phys. Chem. 80, 1998 (1976).CrossRefGoogle Scholar
  24. 24).
    Morrow, B. A., I. A. Cody, and L. S. M. Lee, J. Phys. Chem. 80, 2761 (1976).CrossRefGoogle Scholar
  25. 25).
    Fink, P. and B. Camara, Z. Chem. 12, 35 (1972).CrossRefGoogle Scholar
  26. 26).
    Low, M.-J. D. and Y. Harano, J. Res. Inst. Catalysis Hokkaido Univ. 16, 271 (1968).Google Scholar
  27. 27).
    Kubelková, L., P. Schürer, and P. Jirů, Surface Sci. 18, 245 (1969).CrossRefGoogle Scholar
  28. 28).
    McDonald, R. S., J. Phys. Chem. 62, 1175 (1958).CrossRefGoogle Scholar
  29. 29).
    Beliakova, L. D. and A. V. Kiselev, Dokl. Akad. Nauk SSSR, 70, 441 (1950).Google Scholar
  30. 30).
    Davarez, M. and J. Bastick, J. Chim. Phys. 66, 935 (1969).Google Scholar
  31. 31).
    Mertens, G. and J. J. Fripiat, J. Colloid Interf. Sci. 42, 169 (1973).CrossRefGoogle Scholar
  32. 32).
    Jeziorowski, H., H. Knözinger, W. Meye, and H. D. Müller, JCS Faraday I 69, 1744 (1973).CrossRefGoogle Scholar
  33. 33).
    Lambert, R. and N. Singer, J. Colloid Interf. Sci. 45, 440 (1973).CrossRefGoogle Scholar
  34. 34).
    Knözinger, H. and H. Stolz, Fortsch. Kolloide Polymere 55, 56 (1971).Google Scholar
  35. 35).
    Knözinger, H., H. Stolz, H. Bühl, g. Clement, and W. Meye, Chem. Ing. Techn. 42, 548 (1970).CrossRefGoogle Scholar
  36. 36).
    Knözinger, H., Acta Cient. Venezolana 24, Suppl. 2, 76 (1973).Google Scholar
  37. 37).
    Knözinger, H. and W. Stählin (to be published).Google Scholar
  38. 38).
    Ross, S. and J. P. Olivier, On Physical Adsorption, Interscience Publ. (Newe York, London, Sydney 1964).Google Scholar
  39. 39).
    Jeziorowski, H. and H. Knözinger, Z. Phys. Chem. (Frankfurt) 90, 155 (1974).Google Scholar
  40. 40).
    Weiss, A., (personal communication).Google Scholar
  41. 41).
    Dunken, H. H. and H. Hobert, Z. Phys. Chem. 260, (Leipzig 1979) (in press).Google Scholar
  42. 42).
    Dunken, H. H., (personal communiication).Google Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag 1980

Authors and Affiliations

  • H. Knözinger
    • 1
  • W. Stählin
    • 1
  1. 1.Institut für Physikalische ChemieUniversität MünchenMünchen 2

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