Zeolites which contain five-membered rings of silica tetrahedra (HZ mordenite, Na-ZSM-5, and H-ZSM-11) present a 29Si-n.m.r. line at ca.–113 p.p.m. in contrast with other zeolites which do not contain this building unit (Na-A, Na-X, Na-Y, and H-L), for which resonance occurs in the –80 to –106 p.p.m. range, depending on the Si:Al ratio.
J. B. Nagy, J. Gilson and E. G. Derouane, J. Chem. Soc., Chem. Commun., 1981, 1129 DOI: 10.1039/C39810001129
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