Abstract
By recording high-resolution solid-state NMR spectra of zeolitic samples spun (at ∼3 kHz) at the magic angle (θ = 54° 44′ so that 3 cos2 θ−1 = 0) to the magnetic field, the chemical identity of the first and second coordination shells surrounding Si may be determined, and a distinction made between octahedrally and tetrahedrally bonded Al. The technique, therefore, enables the atomic course of dealumination, known to be responsible for the stabilization of catalytic zeolites, to be directly determined.
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Klinowski, J., Thomas, J., Fyfe, C. et al. Monitoring of structural changes accompanying ultrastabilization of faujasitic zeolite catalysts. Nature 296, 533–536 (1982). https://doi.org/10.1038/296533a0
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DOI: https://doi.org/10.1038/296533a0
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