Abstract
1 H MAS NMR spectra of H-boralites contain seven lines at 1.0, 1.4, 1.7, 2.3, 2.6, 4.7 and 6.7 ppm with intensities dependent on the activation temperature. The lines at 6.7, 4.7 and 1.7 ppm are assigned to residual ammonium ions, residual water and terminal Si-OH groups, respectively. The prominent line at 2.3 ppm comes from bridging Si-O(H)-B hydroxyls. The lines at 1.0,1.4 and 2.6 ppm are tentatively assigned to B-OH, B-OH⋯O and Si-OH⋯O protons, respectively. The assignment has been assisted by the proton spectra of partially hydrated B2O3 and SiO2, and by infrared measurements.
Similar content being viewed by others
References
M. Taramasso, G. Perego and B. Notari, in:Proc. 5th Int. Conf. on Zeolites, ed. L.V.C. Rees (Heyden, London, 1980) p. 40.
Z. Gabelica, J.B. Nagy, P. Bodart and G. Debras, Chem. Lett. (1984) 1059.
K.F.M.G.J. Scholle, A.P.M. Kentgens, W.S. Veeman, P. Frenken and G.H.P. van der Velden, J. Phys. Chem. 88 (1984) 5.
B.L. Meyers, S.R. Ely, N.A. Kutz, J.A. Kadukand, E. van den Bossche, J. Catal. 91 (1985) 352.
K.F.M.G.J. Scholle and W.S. Veeman, Zeolites 5 (1985) 118.
P. Bodart, J.B. Nagy, Z. Gabelica and E.G. Derouane, Appl. Catal. 24 (1986) 315.
J.L. Guth, H. Kessler and R. Wey, Pure Appl. Chem. 58 (1986) 1389.
G. Coudurier, A. Auroux, J.C. Védrine, R.D. Farlee, L. Abrams and R.D. Shannon, J. Catal. 108 (1987) 1.
H. Kessler, J.M. Chézeau, J.L. Guth, H. Strub and G. Coudurier, Zeolites 7 (1987) 360.
E. Brunner, D. Freude, M. Hunger, H. Pfeifer, W. Reschetilowski and B. Unger, Chem. Phys. Lett. 148 (1988) 226.
B. Sulikowski and J. Klinowski, in:Zeolite Synthesis, ACS Symp. Ser. 398, eds. M.L. Occelli and H.E. Robson (ACS, Washington, 1989) p. 393.
J. Datka and Z. Piwowarska, J. Chem. Soc. Faraday Trans. 185 (1989) 47.
J. Datka and Z. Piwowarska, J. Chem. Soc. Faraday Trans. 185 (1989) 837.
P. Ratnasamy, S.G. Hegde and A.J. Chandwadkar, J. Catal. 102 (1986) 467.
T.A. Carpenter, J. Klinowski, D.T.B. Tennakoon, C.J. Smith and D.C. Edwards, J. Magn. Reson. 68 (1986) 561.
G. Engelhardt and D. Michel,High Resolution Solid State NMR of Silicates and Zeolites (Wiley, New York, 1987).
J. Datka and M. Kawalek, Coll. Czech. Chem. Commun. 57 (1992).
A. Vega and Z. Luz, J. Phys. Chem. 91 (1986) 365.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Datka, J., Kolodziejski, W. & Klinowski, J. 1H MAS NMR studies of hydroxyl groups in aluminium-free H-boralites. Catal Lett 24, 265–270 (1994). https://doi.org/10.1007/BF00811799
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00811799