Study of highly siliceous MFI zeolites prepared in fluorine medium by solid state 29Si, 27Al and 19F NMR
Written by sctunisie no commentsHighly siliceous MFI-type zeolites, containing tetrapropylammonium and synthesized in the presence of fluoride ions, were characterized by high resolution solid state 29Si, 27Al and 19F NMR was revealed the presence of some extra-framework species and of quantify of structural defects. Various post-synthesis treatments, namely calcination at 550°C under air of these zeolites led to partial or nearly total healing of these defects in the final materials.
Z. Lounis, F. Djafri, H. Taibi, A. Bengueddach, A. Djafri
Zeolites, alumino-silicate, ZSM-5, RMN 29Si,27Al and 19F
Pages 129-135
