Abstract
Solid-state NMR shows that the treatment of zeolite Y by H4EDTA dealuminates the zeolite framework. Since no extra-framework aluminium is found, all the Al removed from the framework is subsequently washed out of the crystallites in the form of an H4EDTA complex. Unlike with hydrothermal dealumination or treatment with SiCl4, H4EDTA gives defective crystals in which framework vacancies created by the expulsion of aluminium are not healed by silicon from other parts of the framework. The likely reason for this is the slow intracrystalline diffusion of Si(OH)4 at low temperatures.29Si CP/MAS NMR and infrared spectra confirm the creation of hydroxyl nests in the zeolitic framework. A small amount of disordered siliceous phase responsible for a low intensity29Si MAS NMR shoulder at −110 ppm is produced in the process.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
H. Kacirek and H. Lechert, J. Phys. Chem. 80(1976) 1291.
F. Delprato, L. Delmotte, J.L. Guth and L. Huve, Zeolites 10 (1990) 546.
D. Barthomeuf and R. Beaumont, J. Catal. 30 (1973) 288.
H. Hamdan, B. Sulikowski and J. Klinowski, J. Phys. Chem. 93 (1989) 350.
C.V. McDaniel and P.K. Maher, in:Molecular Sieves (Society of Chemical Industry, London, 1968)p. 186.
G.T. Kerr, J. Phys. Chem. 71 (1967) 4155; 72 (1968) 2594.
H.K. Beyer and I. Belenykaja, in:Catalysis by Zeolites, eds. B. Imelik, C. Naccache, Y. BenTaarit, J. Védrine, G. Coudurier and H. Prialiaud (Elsevier, Amsterdam, 1980) p. 203.
J. Scherzer, J. Catal. 54 (1978) 285.
J. Klinowski, S.C. Gobbi, S. Vasudevan, C.A. Fyfe and J.M. Thomas, J. Chem. Soc. Chem. Commun. (1981) 510.
G.W. Skeels and S.W. Breck, in:Proc. Int. Zeolite Conf., eds. D.H. Olson and A. Bisio (Butterworths, Guildford, 1984) p. 87.
J. Scherzer, in:Catalytic Materials: Relationship Between Structure and Reactivity, eds. T.E. Whyte Jr., R.A. Dalla Betta, E.G. Derouane and R.T.K. Baker, ACS Symp. Series No. 248 (Am. Chem. Soc., Washington, 1984) p. 157, and references therein.
P. Féjes, I. Hannus and I. Kiricsi, Zeolites 4 (1984) 73.
A. Ciembroniewicz, J. Zólcinska-Jezierska and B. Sulikowski, Polish J. Chem. 53 (1979) 1325.
U. Lohse, M. Stach, H. Thamm, W. Schirmer, A.A. Isirikjan, N.J. Regent and M.M. Dubinin, Z. anorg. allg. Chemie 460 (1980) 179.
J. Klinowski, S. Ramdas, J.S. Hartmann, G.C. Gobbi, C.A. Fyfe and J.M. Thomas, J. Chem. Soc. Faraday Trans. II 78 (1982) 1025.
G. Engelhardt and D. Michel,High Resolution Solid State NMR Spectroscopy of Silicalites and Zeolites (Wiley, New York, 1987).
J. Klinowski, C.A. Fyfe and G.G. Gobbi, J. Chem. Soc. Faraday I 81 (1985) 3003.
D.W. Breck and E.M. Flanigen, in:Molecular Sieves (Society of Chemical Industry, London, 1968) p. 47.
J.R. Sohn, S.J. DeCanio, J.H. Lunsford and D.J. O'Donnell, Zeolites 6(1986)225.
L. Kubelková, V. Seidl, G. Borbely and H.K. Beyer, J. Chem. Soc. Faraday Trans. I 84 (1988) 1447.
J. Klinowski, Progr. NMR Spectry. 16 (1984) 237.
Author information
Authors and Affiliations
Additional information
On leave from the Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Krakow, Niezapominajek 1, Poland.
Rights and permissions
About this article
Cite this article
Datka, J., Kolidziejski, W., Klinowski, J. et al. Dealumination of zeolite Y by H4EDTA. Catal Lett 19, 159–165 (1993). https://doi.org/10.1007/BF00771751
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00771751