The dynamics of produced CO and H-2, measured by pulse surface reaction rate analysis (PSRA), revealed that the intermediate hydrocarbon species for the CO2-reforming of CH4 was highly hydrogen-deficient (CH0.75) on supported Co/Al2O3 catalyst. It was also found that the species was more reactive than the less hydrogen-deficient one (CH2.4) on Ni/Al2O3 catalyst.