Abstract
Gas mixtures simulated a stational exhaust, composed of SO2(1000ppm), 02(5%), H2O (8%), NO(1000ppm) and N2 as balance gas, were applied for the desulfurization carbon sorbents with or without Fe2O3 prepared from impregnation of saw dust powder into water or a ferrous sulfate solution followed by drying and carbonization in a N2 stream at 850°C. Thermogravimetric analyses were carried out on the weight increase by oxidative sorption of SO2 and the weight decrease by carbon gasification in the various gas mixtures at a constant temperature over 150°C to 350°C.Coexistence of H2O or NO-H2O into the SO2-O2-N2 mixture enhanced both oxidation potential of SO2 and gasification potential of carbon component of the sorbent: the sorption of SO3/H2SO4 predominated to increase sample weight at lower temperature 150°C, but carbon gasification predominated at above 250°C, where no gasification occurred with the SO2-O2-N2 mixture below 250°C.
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