Marcinkowski et al., reported the value for C-H bond activation on Cu(111) surface, E ads -0.38 eV, with reaction barrier of 1.4 eV, which is similar to our results, E ads = -0.34 eV, E act = 1.32 eV. Coiobica et al. reported that on pure Ru(0001) surface the barrier for rst C-H bond dissociation is 0.88 eV (85 kJ mol-1) for the physisorbed methane. Interestingly,