CO2 GASIFICATION OF EUCALYPTUS WOOD CHARS

Chars obtained from Eucalyptus grandis sawdust at different carbonizat ion temperatures were gasified with CO2 in isothermal and non-isotherm al t.g. experiments. At low and intermediate conversion values the rea ctivity can be reasonably well explained in terms of the development o f surface area as gasification proceeds. At high conversion values a s teep increase in reactivity is observed which can be attributed to the increasing catalytic effect of the metallic constituents (mainly Na a nd K) of the inorganic matter present in the chars. Activation energie s in the range 230-261kJ mol(-1) are obtained. Copyright 1996 Elsevier Science Ltd.