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Thermogravimetric study on the pyrolysis kinetic mechanism of waste biomass from fruit processing industry

The detailed kinetic analysis of slow pyrolysis process of apricot (Prunus armeniaca L.) kernal shells has been estimated, under non-isothermal conditions, through thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG). Thermal decomposition was implemented using four different heating rates (5, 10, 15 and 20 °C min), with consideration of how this parameter effects on the process kinetics. The higher heating rates provoke the shift of thermo-analytical curves towards more elevated temperatures. Using isoconversional differential method, the variation of activation energy (Ea) with conversion fraction (α) was detected, and pyrolysis reaction profile was discussed. After resolving the pyrolysis rate curves of individual biomass constituents, the temperature and conversion ranges of their thermal transformations were clearly identified. In the latter stage of analysis, every identified reaction step was considered through mechanistic description, which involves selection of the appropriate kinetic model function. The comparison of the results as well as discrepancies between them has been discussed. The corresponding rate-law equations related to thermal decomposition reactions of all biomass constituents present in the tested agricultural waste material have been identified.