NOVELTY - A regenerable scrubber (12) contains a porous support material (62), acid solution (60), preferably phosphoric acid, absorbed within the porous support material, and noble metal catalyst dispersed through the porous support material. The porous support material can be predetermined numbers of cylindrical carbon pellets. The noble metal catalyst is platinum dispersed through the porous support material at a concentration between 0.1 wt.% and 1.0 wt.% of predetermined weight of porous support material.    USE - Regenerable ammonia scrubber system for removing ammonia from fuel stream for a fuel cell e.g. phosphoric acid fuel cell, proton exchange membrane fuel cell used in transportation vehicles, portable power plants or stationary power plants.    ADVANTAGE - Uses cylindrical carbon pellets as porous support material to minimize a pressure drop of gaseous fuel passing through regenerable scrubber. Catalyzes the porous support material with noble metal, preferably platinum, so that electrochemical potential, oxidation and regeneration rates of regenerable scrubbers are effectively increased through use of small amount of expensive noble metal. Provides maintenance of initial system concentration condition of noble metal dispersed through the porous support material through repeated absorption-regeneration cycles. Controls regenerable ammonia scrubber system through changing fuel and oxidant distribution valves, oxidant exhaust valves and fuel inlet valves or through application of different control units for directing flow of fuel stream and oxidant through the regenerable ammonia scrubber system.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a removing method of ammonia from a fuel stream for a fuel cell e.g. phosphoric acid fuel cell, proton exchange membrane fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing is a simplified schematic representation of the regenerable ammonia scrubber system for fuel cell.    Regenerable scrubber (12)    Fuel cell (18)    Fuel source (30)    Acid solution (60)    Porous support material (62)