Characterization of delaminated zeolites by 129Xe NMR with laser-hyperpolarized xenon

Delaminated materials (ITQ-2 and ITQ-6) and their corresponding zeolite precursors, MCM-22 and ferrierite, respectively, have been studied with 129Xe NMR of adsorbed xenon. With respect to the spectra of the precursors, one-dimensional (1D) spectra of delaminated materials show additional lines at lower chemical shift characteristic of larger adsorption sites. Two-dimensional (2D) exchange NMR experiments of samples under magic angle spinning conditions and continuous flow of Xe allowed to determine the exchange between different sites and obtain information on the delamination process.