NOVELTY - Capturing sulfur impurities e.g. carbonyl sulfide and/or carbon sulfide, present in gas feeds containing hydrogen gas and/or carbon monoxide, comprises: desulfurizing the feed by contacting it with a retaining material containing an active phase at a temperature of 20-450 degrees C; optionally inerting the sulfurized retaining material; oxidatively regenerating the retaining material; optionally inerting the regenerated retaining material; and desulfurizing the feed by contacting it with the retaining material that has been regenerated and rendered inert at a temperature of 20-450?C.    USE - The process is useful for capturing sulfur impurities comprising hydrogen sulfide and/or carbonyl sulfide and/or carbon sulfide, present in gas feeds containing hydrogen gas and/or carbon monoxide. The retaining material is useful for desulfurization of gas feeds comprising natural gas or synthetic gases, preferably gases containing hydrogen gas and/or carbon monoxide (all claimed), where the purified gas feeds are useful in cogeneration plants (such as integrated gasification combined cycle power stations), in chemical synthesis units such as for synthesizing methanol, or Fischer-Tropsch synthesis units.    ADVANTAGE - The process: improves the performance of the materials used in fuel cells; and performs at a moderate temperature and easy to regenerate in-situ.    DETAILED DESCRIPTION - Capturing sulfur impurities comprising hydrogen sulfide, carbonyl sulfide and/or carbon sulfide, present in gas feeds containing hydrogen gas and/or carbon monoxide, comprises: desulfurizing the feed by contacting it with a retaining material containing an active phase comprising at least one metal oxide-I of group VIIb, VIIIb, Ib or IIb, and at least one metal oxide-II comprising chromium, molybdenum, tungsten or rare earths comprising praseodymium, neodymium or cerium, at a temperature of 20-450 degrees C, where the molar ratio of the metal oxide-I and metal oxide-II is 0.6:20; optionally inerting the sulfurized retaining material; oxidatively regenerating the retaining material; optionally inerting the regenerated retaining material; and desulfurizing the feed by contacting it with the retaining material that has been regenerated and rendered inert, at a temperature of 20-450?C, where the retaining material has been regenerated at a temperature of 20-600 degrees C, preferably 300-480 degrees C. An INDEPENDENT CLAIM is included for the material for capturing sulfur impurities, containing an active phase comprising a metal oxide compound of formula (A1xB1yOz) and (A1tOu).    A1 = VIIb, VIIIb, IB or IIb group metal;    B1 = Cr, Mo, W or rare earth metal comprising Pr, Nd or Ce; and    (x+t):y = 0.6:20.    N.B. z and u are not defined.