SYNTHESIS, CHARACTERIZATION, AND CATALYTIC PROPERTIES OF METALLO-TITANIUM SILICATE MOLECULAR-SIEVES WITH MEL TOPOLOGY

The synthesis and characterization of metallo-titanium silicate analogs (M = Al or Fe) with MEL structure are reported. The simultaneous incorporation of both M3+ (Al3+ or Fe3+) and Ti4+ in the MEL framework provides dual catalytic properties in both oxidation (e.g., oxyfunctionalization of n-hexane) and acid catalyzed reactions (e.g., ethylbenzene disproportonation and m-xylene isomerization). The [M, Ti]-MEL molecular sieves, compared to the [M]-MEL analogs, were (i) more resistant towards deactivation in ethylbenzene disproportionation and m-xylene isomerization and (ii) less para selective in the latter reaction. © 1994 Academic Press, Inc.