CONICET | Buscador de Institutos y Recursos Humanos

Pyrolysis characteristics and kinetic study of sixregional lignocellulosic wastes (sawdust, marcs, stalks, peach plum and olivepits) at different heating rates was investigated using thermogravimetricanalysis. The pyrolysis could be divided into three stages, drying, active andpassive pyrolysis. The specific location where the thermal degradationreactions are occurring is called active pyrolysis zone. The samples have thehighest residual weight equal to 35-40% at 603K, approximately during thisstage.To describe the acative pyrolysis behavior, the CoatsRedfern and Sharp methods were used. The contraction geometry´s model describesthis phenomenon, indicating that the degradation rate is controlled by the resultingreaction interface progress towards the center of the solid.The activation energy value for the active pyrolysisstage are between 38.96 and 68.99 J/mol for all studied agro-industrial wastes.This parameter increases with the heating rate. This variation can be due tothe fact that he kinetic rate of active pyrolysis is controlled by theoccurrence of physical transformation the temperature-dependent which is notmass dependent. The calculated values of pre-exponential factor were about2.01*107 and 2.51 *1010 s-1. These parametersindicate that the pyrolysis of the studied wastes is similar to otherlignocellulosic materials, proving the feasibility of their valorization bypyrolysis.