Patent ID: 8598066

Claim:
A cobalt-based catalyst for Fischer-Tropsch (F-T) synthesis, in which cobalt is supported on a phosphorus-alumina support, the catalyst made by: preparing an aluminum alkoxide solution by mixing an aluminum alkoxide in an alcohol-based organic solvent; preparing a phosphorus-containing boehmite sol by mixing 0.01-1 moles of an organic carboxylic acid with pKa of 3.5-5 and 2-12 moles of water relative to one mole of the aluminum alkoxide in the aluminum alkoxide solution relative to one mole of the aluminum and adding 0.001-0.4 moles of a phosphorus precursor, followed by heating the solution at 80-130° C.; preparing a powdery phosphorus-containing boehmite by distilling and drying the phosphorus-containing boehmite sol to separate and recover alcohol; preparing a phosphorus-alumina support by calcining the powdery boehmite at 300-800° C.; the phosphorus-alumina support having bimodal pore size distribution including smaller pores and larger pores; and adding cobalt precursor solution to the phosphorus-alumina support to make the cobalt-based catalyst with 5-40 wt % of cobalt content; wherein the phosphorus-alumina support has a specific surface area of 300-500 m 2 /g and an area ratio [SA 1 /SA 2 ] of 5-10, wherein the SA 1 is a specific surface area of the smaller pores and the SA 2 , is a specific surface area of the larger pores, the smaller pores being 1-20 nm and the larger pores being 21-200 nm.