Figure 12. ( a ) Dependence of catalysts activity in steam reforming of methane at different temperatures as a function of the promoter amount ( 873 K, 823 K, 773 K); ( b ) Influence of hydrogen on the activity of catalysts in steam reforming of methane ( Ni, Ni-Mo (0.5), Ni-Mo (1.0), Ni-Mo (2.0)) [54].