Abstract
The pyrolysis of lignocellulosic materials was studied by multistage isothermal thermogravimetry over a wide range of temperature. For each material (a hardwood, a softwood and a bark), pyrolysis could be interpreted as the independent thermal degradation of a small number of discrete fractions, each with well defined kinetics. Similar fractions (in number, size and reaction kinetics) recur in each of the three materials studied. The largest fraction is similar to cellulose. The smaller fractions probably correspond to successive stages in the thermal degradation of lignin and hemicelluloses. Kinetic parameters were obtained for the pyrolysis of each fraction, with activation energies ranging from 52 to 318 kJ/mol.
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