The steel industry contributes to the minimization of emissions of CO2 promoting the study of carbonaceous materials, one of them being the charcoal, a renewable source. The main objective of this study was to measure, in a laboratory scale, selected carbonaceous materials reactivity for CO2. To perform it, charcoal was elected to be compared with coal, metallurgical coke and green petroleum coke (pet coke). The quantitative results were obtained by the method of weight loss (ASTM D5341-99). The procedure was carried out using briquettes of each material, previously grinded to a particle size smaller than 125 m, and fed to a tubular furnace at a temperature of 1100 degrees Celsius , using a N2 injection, with a stream of 0.6 Nl/min, to insure an inert atmosphere only during heating and cooling steps of the experiments. To perform the reactivity tests, CO2 was used as the species to react with the C element present at the samples composition. The tests took 2 hours, with a CO2 flow rate of 0.9 Nl/min, in a temperature of 1100 degrees Celsius. According to the results obtained, it was found that the charcoal has the higher reactivity and the green petroleum coke the less reactive. For the metallurgical coke and coal, their reactivities were intermediary between charcoal and green pet coke, being coal more reactive than coke for both, volatilized and non-volatilized samples.