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The effects of the chemical heat treatments of a semianthracite char (AC) on the textural properties and the gasification in air they are investigated. Sample AC first was treated with the LiCl/KCl mixture or the mixture formed by LiCl/IKCl and a metallic oxide, M n = 1, 2O (MgO, CaO, FeO, CoO, NiO, Cu2O or ZnO) at 743, 873 or 1173 K and products obtained they were then washings carefully with water distilled. The information on the textural modifications was deduced of isotherms of CO2 adsorption to 273 K. The reactivity tests were taken to the temperature 808, 823 and 838 K. As resulting from the AC treatments, on developed the microporosity and on increase the air reactivity, in particular, the first effect is greater whim the used mixture went LiCl/KCl/CoO at 1173 K and the second effect are greater when the used mixture went LiCl/KCl/Cu2O at 1173 K. [ABSTRACT FROM AUTHOR]