CATALYTIC PERFORMANCE OF ALUMINOFERRISILI CATES SYNTHESIZED USING 1-BUTANOL AS A TEMPLATE

ZSM-5, ZSM-11 and aluminoferrisilicates were synthesized using 1-butan ol, tetrapropylammonium bromide, hexamethylenediamine and tetrabutylam monium bromide as the template. The differences in the physicochemical properties and the catalytic performances for the conversion of metha nol to light olefins were investigated. The reaction temperature was c ontrolled to give the conversion of methanol to hydrocarbon of about 4 0%. In the case of ZSM-5 type aluminoferrisilicate synthesized using 1 -butanol, the crystallinity was very high and the crystal size (4 x 9 mum) was larger. The amounts of Al and Fe in the zeolite were larger t han those of zeolites synthesized using templates other than 1-butanol . The FT-IR spectra showed that the structure defects are scarce withi n the crystal (Table 2, Figs. 1, 2). The catalytic activity of alumino ferrisilicate was about one fifth of that of the corresponding alumino silicate zeolite without Fe. The (C2H4 + C3H6) selectivities for ZSM-5 type aluminosilicate and aluminoferrisilicate synthesized using 1-but anol, was higher than those of zeolites synthesized using templates ot her than 1-butanol, indicating suppression of the oligomerization reac tions of ethylene and propylene to C6+ hydrocarbons except BTX at the lower reaction temperature of about 300 approximately 320-degrees-C (T able 3, Figs. 3, 5, 7).