Patent ID: 8043589

Claim:
A process for removing COS and H 2 S from a feed synthesis gas stream comprising COS, H 2 S, NH 3 and HCN, wherein the process comprises contacting the feed synthesis gas stream in the presence of up to 1% volume water with a solid adsorbent at a temperature in the range of from 100 to 240° C. to remove COS, H 2 S, NH 3 and HCN, thereby obtaining a purified synthesis gas stream, wherein the solid adsorbent comprises 0.1 to 3 wt % alumina, based on the solid adsorbent, and a metal or an oxide of said metal or a combination thereof, wherein the metal is selected from the group consisting of Ag, Sn, Mo, Fe and Zn; and contacting the purified synthesis gas stream with a washing liquid at a temperature in the range of from 40 to 110° C. and a pressure of from 20 to 80 bara to remove any NH 3 present in the purified synthesis gas stream, thereby obtaining a washed purified synthesis gas stream having less than 10 ppbv each of COS, H 2 S, NH 3 and HCN, suitable for use in a Fischer-Tropsch process.