The kinetics of hydrogen formation at various amounts of H2S /1–60%/ in the radiolysis of CO–H2S mixture has been studied. The ratio of the reaction rate constants for reactions COx+COproduct and COx+H2S
H+SH=CO, which amounts to
5×10–2, has been estimated. The effective activation energy of hydrogen formation /Eeff/ has been determined at various amounts of H2S in the temperature interval 323–573 K.