Author/Authors :
Chen، نويسنده , , T.H. and Wang، نويسنده , , J.Z. and Li، نويسنده , , H.X. and Wang، نويسنده , , K.X. and Deng، نويسنده , , F. and Du، نويسنده , , Thomas Y.R. and Ding، نويسنده , , D.T.، نويسنده ,
Abstract :
Overlapping 23Na NMR signals of zeolite Na-omega are observed by a 2D MAS quadrupolar nutation NMR spectrum and VASS NMR spectra. The low-field Lorentzian shape component centered at − 3 ppm is assigned to the signal of mobile Na+ cations located in twelve-membered ring channels. The high-field component, varying considerably with the spinning angles of VASS NMR spectra, is assigned to the signal of less mobile Na+ cations located in gmelinite cages. The partition between two categories of Na+ cations is determined by the simulation of VASS NMR spectra with the theoretical consideration extended to more general case that both the quadrupolar and chemical shift anisotropic interactions coexist.
