EFFECT OF PREPARATION METHOD ON 5-PERCENT CO NB205 IN FISCHER-TROPSCHSYNTESIS (FTS)/

Three preparation methods of 5% Co/Nb2O5 were studied : incipient wetn ess impregnation, deposition-precipitation with and without aging, Its effects over total area, mean pore diameter, cobalt species and acidi ty of reduced catalysts were investigated by BET, Hg porosimetry, XRD, DRS, TPR, TPO and NH3 TPD. TPR results showed that the reduction proc eeds as two steps (Co+3-->Co+2-->Co0). TPR and DRS indicated the prese nce of Co+2 in the precipitated catalysts. The main phase was Co3O4 in all catalysts. The FTS selectivity showed good correlation with the s trong acidity.