AL-27 SOLID-STATE NMR-SPECTRA OF ULTRASTABLE ZEOLITE-Y WITH FAST MAGIC-ANGLE SPINNING AND H-1-AL-27 CROSS-POLARIZATION

Fast (> 12 kHz) magic-angle-spinning NMR with H-1-Al-27 cross-polarization quantitatively monitors several aluminous species in dealuminated zeolite Y; the non-framework matter contains 4-, 5- and 6-coordinated Al and the Al-27 signal at 30 ppm is an independent resonance probably due to 5-coordinated non-framework Al and not part of a second-order quadrupole lineshape as previously reported.