SPECIFIC-INHIBITION AS THE KINETIC PRINCIPLE OF THE FISCHER-TROPSCH SYNTHESIS

FT CO-hydrogenation on cobalt catalysts has been performed in a well s tirred continuously operated slurry reactor with and without addition of n-octene-1 at different CO partial pressures. Kinetic data have bee n determined with the help of a mechanistic model. Increasing CO parti al pressure inhibits individual reaction steps selectively, in particu lar associative methane desorption, the steps of chain termination (as paraffins and olefins likewise), whereas in secondary olefin conversi on hydrogenation is inhibited drastically, however double bond shift i s even promoted. Secondary hydrogenation is concluded to proceed on di fferent sites than chain growth.