Abstract

Grape pruning residue (GPR), a common type of agricultural waste, represents a missed opportunity for resource optimization if left unutilized. Pyrolysis offers a promising method to achieve the high-value utilization of GPR. The study of pyrolysis kinetics is crucial for understanding the pyrolysis behavior of GPR. In this research, the kinetic parameters of GPR were estimated using multistep reaction (MSR) model. The apparent activation energies (E alpha) of hemicellulose, cellulose, and lignin were determined to be 166.034, 146.301, and 446.534 kJ/mol, respectively. The pre-exponential factors (A) were calculated as 9.790 x 1014, 4.836 x 1012, and 6.712 x 1033 s-1, respectively. The reaction mechanism (f(alpha)) were expressed as f 1 (alpha 1 ) =alpha 11.2258(1-alpha 1)0.8011[-ln(1-alpha 1)]- 1.5723, f 2 (alpha 2 ) = alpha 22.0985(1-alpha 2)0.7386[-ln(1-alpha 2)]- 1.4410 and f 3 (alpha 3 ) = alpha 31.3944(1-alpha 3)3.6981[-ln(1-alpha 3)]- 6.9943, respectively. Finally, the fast pyrolysis behavior of GPR at 400 degrees C, 600 degrees C, and 800 degrees C was investigated using Py-GC/MS. This study provides a theoretical foundation for utilizing GPR as a bioenergy source, advancing the valorization of agricultural waste through pyrolysis