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Gasification kinetics parameters have been derived for birch and beech char samples (45μm<d<60μm) pyrolysed under identical conditions. Reactivity experiments were made in steam-hydrogen-nitrogen mixtures at atmospheric pressure. Reactivity profiles have been obtained in the temperature range from 750 °C to 950 °C, for H2O partial pressures of 0.05, 0.1, 0.2, 0.5 and 1.0 bar and H2 partial pressures of 0.1, 0.2 and 0.3 bar. Assuming n order kinetics for pure steam experiments, the activation energy and the reaction order are E=211 kJ/mol and n=0.51 for beech and E=237 kJ/mol and n=0.57 for birch. A kinetic expression based on LangmuirHinshelwood kinetics fairly describes the observed hydrogen inhibition effect on the steam-carbon reaction. The differences between the kinetics determined for the two fuels are relatively small and partly due to the origin and quality of the raw wood. The kinetic parameters obtained are presented using a kinetic compensation diagram; they are compared with literature data and discussed. The influence of the calculation procedure on the results is also discussed. It is found that the data evaluation procedure mostly influences the pre-exponential factor and less the activation energy and reaction order.

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