SYNTHESIS, CHARACTERIZATION AND CATALYTIC PROPERTIES OF FERRI-SILICATE AND GALLO-SILICATE ANALOGS OF ZEOLITE NCL-1

Ferri- and gallo-silicate analogues of NCL-1, a high silica large pore zeolite, have been synthesized and characterized through spectroscopi c methods (XRD, IR, ESR and solid state MAS NMR), ion exchange capacit y, adsorption (n-hexane, 1,3,5-trimethylbenzene and water), BET surfac e area and catalytic activity and selectivity in Bronsted acid catalyz ed conversion of 1,3,5-trimethylbenzene measurements. These data were compared with those exhibited by Al-NCL-1 analogue. During 1,3,5-trime thylbenzene (mesitylene) isomerization into 1,2,4-trimethylbenzene (ps eudocumene), the conversion decreased in the order: Al- > Ga- > Fe-NCL -1 (at the same reaction temperature, WHSV and time on stream). Howeve r, the selectivity for pseudocumene and isomerization selectivity (vis -a-vis disproportionation) followed the reverse order at comparable co nversion level.