EFFECT OF THE SUPPORT ON THE FISCHER-TROPSCH SYNTHESIS WITH CO NB2O5 CATALYSTS/

Niobia-supported cobalt catalysts reduced at temperatures between 553 and 773 K have been compared with alumina-supported cobalt catalysts. The hydrogen adsorption capacity and the catalytic properties for the CO-H-2 reaction were independent of the temperature of reduction of th e alumina-supported catalyst. In contrast, the amount of hydrogen chem isorbed and the activity for CO conversion decreased with increasing r eduction temperature for the niobia-supported catalyst. The results ar e interpreted in terms of the strong metal-support interaction (SMSI) effect, established for Co/Nb2O5 after reduction at 673 and 773 K and not fully destroyed during the catalytic reaction. Higher temperatures of reduction of Co/Nb2O5 catalysts results in a better selectivity to wards C5+ compounds and a low selectivity towards C1, in the CO-H-2 re action performed at 533 K.