MOSSBAUEIR AND MAGNETIC STUIlIES OF IRON-ZEOLITE AND IRON-COBALT ZEOLITE CATALYSTS USED IN SYNTHESIS GAS CONVERSION

Medium-pore (diameter .---. 6A) zeolites such as ZSM-5 and silicalite impregnated with Group VIII metals provide selective catalytic pathways for the conversion of synthesis gas to gasoline or olcfins. Mossbauer and magnetic studies on these catalysts containing iron or iron plus cobalt are reported. The zeolites were impregnated with metal nitrate solutions, reduced, and carbided to yield showed Fe3 type spectra. The ZSM-5 (14.7 % Fe) and Silicalite (13.6 % Fe) samples exposed to H2 (450 C) showed an approximate 85% reduction to the metallic state. The carbidcd ZSM-5 (14.7 % Fe) revealed a spectrum of Hagg carbide (Fe5C2 ), an active component of the catalyst. The used catalysts showed mixtures or Hagg carbide (Fe5C2) and cementite (Fe3C). It is suggested that the selectivity of ZSlVJ-5 (5.6 % Fe. 4.5 % Co) resulted from iron-cobalt alloy formation.