Process for the preparation of fischer-tropsch catalysts with a high mechanical, thermal and chemical stability.

Abstract

The preparation Is described of a Fischer-Tropsch catalytic precursor based on cobalt supported on alumina, optiona11y containing up to 10% by weight of si1ica, which comprises: treatment of the alumina with a silicon compound selected from those having general formula (I) Si(OR)4-n R’n (I) wherein n ranges from 1 to 3 wherein R’ is selected from primary hydrocarbyl radicals having from 1 to 20 carbon atoms; wherein R is selected from, primary hydrocarbyl radicals having from 1 to 6 carbon atoms; b) drying and subsequent calcination of the modified car¬rier obtained at the end of step (a) thus obtaininq a silanized carrier; c) subsequent deposition of cobalt on the silanized carrier obtained at the end of step (b); d) drying and subsequent calcination of the supported cobalt obtained at the end of step (c) thus obtaining the fi¬nal catalytic precursor; the above final catalytic precursor having a content of Si(O)2 deriving from the compound having general formula (I) ranging from 4.5 to 10% by weight.