ALKALI-FREE SYNTHESIS OF MFI TYPE BORO-TITANOSILICATES USING METHYLAMINE

new synthesis route leading to a rapid crystallization of boro-titano MFI type zeolites from methylamine media has been explored. The princi pal advantage of this synthesis method is that the use of costly ingre dients such as TPAOH and Ti- and Si-alkoxides can be avoided. Ti and B are readily incorporated into the MFI framework as confirmed by spot EDX analysis, IR, B-11-NMR and XPS. Preheating the borosilicate gel be fore mixing with titanium tetrachloride improves the (B,Ti)-MPI crysta llization rate and prevents the formation of extraframework titanium d ioxides. (C) 1997 Elsevier Science B.V.