Patent ID: 8282901

Claim:
A method for removing sulfur dioxide (SO 2 ) from a carbon dioxide feed gas comprising SO 2 as a contaminant, said method comprising: contacting said carbon dioxide feed gas at an elevated temperature of at least 375° C. and an elevated pressure with a heterogeneous catalyst for oxidizing SO 2 , in the presence of oxygen (O 2 ) to convert SO 2 to sulfur trioxide (SO 3 ) and produce an SO 3 -enriched carbon dioxide gas; contacting SO 3 in said SO 3 -enriched carbon dioxide gas with water to produce sulfuric acid and a SO 2 -depleted carbon dioxide gas; and separating said sulfuric acid from said SO 2 -depleted carbon dioxide gas, or from a SO 2 -depleted carbon dioxide gas derived therefrom.