Catalyst composition containing alumina and process for its preparation.

摘要

Alumina-based composition for a catalyst and a process of manufacture. The alumina-based composition of the invention comprises at least one second element chosen from the group comprising the rare earths and the alkaline-earth elements and is characterised in that the weight concentration of the second element in the composition is between 10 % and 50 % and in that it has a pore volume corresponding to pores with a diameter smaller than 100 nm of between 1.2 cm<3>/g and 3 cm<3>/g, of which at least 80 % corresponds to pores which have a diameter of between 10 nm and 100 nm, after a heat treatment at a temperature of 350 DEG C and after a heat treatment of four hours at 1200 DEG C, a pore volume in the case of the pores with a diameter of less than 100 nm of between 0.6 cm<3>/g and 1.5 cm<3>/g of which at least 90 % corresponds to pores with a diameter of between 20 nm and 100 nm.