[en] Hydrogen extraction from the gaseous mixture CH₄P, H₂, N₂, NH₃, O₂, H₂O, CO₂, occurring as impurities has been performed by chemical reaction with uranium metal - Thermodynamical and kinetical investigations have confirmed hydrogen could be purified by this process, but experiments performed at 973 K point out the importance of the interferences that can occur in the system uranium - gas mixture. The aim of the study is purification of burned gases exhausted from the plasma chamber of a fusion device to recover tritium content of impurities linked with hydrogen atoms