Applied Magnetic Resonance

, Volume 10, Issue 4, pp 447-476

First online:

Double rotation27Al NMR in molecular sieves

  • M. KovalakovaAffiliated withCentrum voor Oppervlaktechemie en Katalyse, K.U. Leuven
  • , P. J. GrobetAffiliated withCentrum voor Oppervlaktechemie en Katalyse, K.U. Leuven

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Although high-resolution NMR spectra can be obtained in solids, the use of27Al NMR to investigate the structure of aluminosilicate and aluminophosphate molecular sieves has been severely limited because anisotropic second-order quadrupolar interactions, responsible for spectral broadening, cannot be eliminated by conventional magic angle spinning (MAS) or multiple pulse techniques. Here we give the principles of the double rotation (DOR) NMR technique which can remove not only the first-order broadenings but also the second-order broadenings in the NMR spectra of quadrupolar nuclei in solids. High-resolution27Al NMR using DOR is capable of resolving discrete framework aluminum sites in aluminophosphate molecular sieves, permitting quantitative investigation of site-specific adsorbate-host interactions, and of discriminating different aluminum species in zeolites.