Reactivity to CO2 of chars prepared in O2/N2 and O2/CO2 mixtures for pulverized coal injection (PCI) in blast furnace in relation to char petrographic characteristics

►The O2/CO2 and O2/N2 chars had similar morphology/appearance in optical microscope. ►Differences due to O2/CO2 and O2/N2 atm. were only found for the low rank coal chars. ►The O2/CO2 chars were more reactive than the O2/N2 chars.