In this work, we studied the slow pyrolysis process of a Moroccan wood
species (Eucalyptus) which is frequently used in the traditional prod
uction of wood charcoal, The non-isothermal pyrolysis was investigated
by thermogravimetric analysis under inert gas (nitrogen) from ambient
to 600 degrees C. We also studied the pyrolysis under the same condit
ions of xylan, cellulose, lignin and their mixture. The results show t
hat the thermal stability increases from lignin to xylan and cellulose
. The charcoal yield of lignin is greater those of xylan and cellulose
. The eucalyptus decomposition appears to be a parallel association of
these three major constituents. The rates reached by eucalyptus durin
g its pyrolysis at 265 and 325 degrees C were attributed to the decomp
osition of hemicellulose and cellulose, respectively. In the range 225
-370 degrees C, the degradation of lignin is hidden by the hemicellulo
se and cellulose degradations. The rate af mass loss of eucalyptus is
slower than that of xylan and cellulose, but greater than that of lign
in.