For removing carbonyl sulfide (COS) from industrial waste gas at low temperatures, the critical approach is to prepare an efficient and cheap catalyst. In this paper, Fe/Cu modified coal‐based activated carbon (AC) was prepared by co‐precipitation method and tested for the catalytic hydrolysis of carbonyl sulfide (COS) at low temperatures in a fixed‐bed reactor. The results showed that the best mole ratio of Fe/Cu was 1 : 1 and the best content of metal oxides was 50 %. BET, XRD, XPS, FTIR, and SEM investigated the structure and surface properties. COS was hydrolyzed on Fe2O3 to produce H2S and CO2, and H2S reacted with CuO to have CuS. At the same time, H2S reacted with Fe2O3 to produce FeS and elementary sulfur. Oxidized elemental sulfur was to form sulfuric acid, which responded with Fe2O3 to form sulfates. The sulfates would be deposited on the catalysts’ surface and block the pore structure. Deactivation of metal oxides and blockage of pore structures were the main reason for catalyst deactivation.
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