Abstract: The disadvantages of model-fitting approach to calculate kinetic parameters used by many researchers presently are discussed. The matching of one set of experimental data with several pyrolysis models is explained in terms of kinetic compensation effect. The relationship between activation energy and conversion rate of Huangjue leaves' pyrolysis at four different rates of raising temperature is solved by using the Friedman method. The whole reaction process of pyrolysis of the leaves does not obey the single kinetic reaction mechanism. Based on the effect of activation energy affected by conversion rate at different periods, the pyrolysis process of the leaves is divided into two stages and then activation energy of the two stages is calculated. The reaction progression and pre-exponential factor are obtained by using Freeman-Carroll method under the condition of above activation energy as reference activation energy.

Key words: kinetic compensation effect, multiple scanning approach, reference activation energy, isoconversional method