Successive, alternating Pulses Of CO2 and N2 fed to beds of iron-impregnated coal char confirm the existence of a redox cycle with iron catalysts. Additional experiments with chars from raw and demineralized coals establish that the catalytic gasification dominates and that the coal ash also functions through a redox cycle. Extending the duration of the CO2 pulse leads to a plateau in the rate of CO formation that has not been previously observed. A redox cycle involving easily oxidized and reduced iron oxide species is proposed as the mechanism for gasification in this plateau region of the pulse.