Two crystallographically non-equivalent and unequally populated tetrahedral aluminium sites are identified by magic-angle-spinning 27Al n.m.r. spectroscopy in the parent zeolite (Si/Al = 4.24 ± 0.05); after treatment with SiCl4 at 500 °C relatively mobile, 6-co-ordinated aluminium is generated (most of it released from one of the tetrahedral sites) and there is evidence for some realumination of the tetrahedral framework.
J. Klinowski, M. W. Anderson and J. M. Thomas, J. Chem. Soc., Chem. Commun., 1983, 525 DOI: 10.1039/C39830000525
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