NOVELTY - The method comprises subjecting a gas stream to contact with an absorption liquid so as to provide an absorbed gas-containing liquid, and bringing the absorbed gas-containing liquid in contact with a catalyst suitable for hydrolyzing carbonyl sulfide and/or carbonyl disulfide. The gas stream is subjected to simultaneous contact with the absorption liquid and with the catalyst, where the contact is brought about in the same vessel. The catalyst, optionally deposited on a mechanical inert support, is dispersed in the solution.    USE - The method is useful for removing carbonyl sulfide and/or carbonyl disulfide from an untreated natural gas stream using a reactor system of a sulfur recovery facility (all claimed).    ADVANTAGE - The method is capable of efficiently removing carbonyl sulfide and/or carbonyl disulfide at a relatively low temperature.    DETAILED DESCRIPTION - The method comprises subjecting a gas stream to contact with an absorption liquid so as to provide an absorbed gas-containing liquid, and bringing the absorbed gas-containing liquid in contact with a catalyst suitable for hydrolyzing carbonyl sulfide and/or carbonyl disulfide. The gas stream is subjected to simultaneous contact with the absorption liquid and with the catalyst, where the contact is brought about in the same vessel. The gas stream is subjected to contact with the absorption liquid in an absorption vessel, and the absorbed gas-containing liquid is subjected to contact with the catalyst downstream of the absorption vessel. The catalyst is a homogenous catalyst dissolved in the absorption liquid, or a heterogeneous catalyst. The catalyst, optionally deposited on a mechanical inert support, is dispersed in the solution. The catalyst is present in or on an absorption column, preferably applied as a coating on the trays of a column, or coated on the packing of a packed column. The carbonyl sulfide and/or carbon disulfide is hydrolyzed at 80-130 degrees C. INDEPENDENT CLAIMS are included for:    (1) a reactor system for removing carbonyl sulfide and/or carbon disulfide from a sour gas stream; and    (2) a sulfur recovery facility.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an acid gas removal unit of a sulfur recovery facility having a hydrolysis reactor on top of a high pressure absorber.