MAGNETIC STUDIES OF FINE FE AND CO SPECIES FORMED IN FE/ZEOLITE CATALYSTS

Magnetic, Mossbauer, and I.R. studies of nanosize particles of Fe and Co species dispersed in a cage of aluminosilicates structure, in relation to syngas (CO+H2) Fischer Tropsch conversion. The difference in the catalytic activity of such species have shown dependancy on their degree of dispersion. The carbonyl impregnation gave ultra-fme Super Paramagnetic Fe3O4, whereas the nitrate impregnation gave larger size particles of Fe3O4 or a-Fe2O3. The active Fe5C2 component was converted to Fe3C during the above reaction.