Synergistic effects and kinetics in co-pyrolysis of waste tire with five agricultural residues using thermogravimetric analysis

Continued social and mobility development has caused sharp increase in the number of waste tires, increased environmental pollution and waste of limited resources. Agricultural residues is a bioresource, which has drawn increased attention in recent years. The thermochemical conversion of waste tires and agricultural residues and their mixtures offers important prospects for scientific development, which can provide energy security and much reduced environmental footprint. In this paper, pyrolysis of waste tires (WT) and its co-pyrolysis with maize stalk (MS), wheat straw (WS), cotton stalk (CS), rape straw (RS) or peanut shell (PS) agricultural residues, in mass ratios of 1:1 were investigated at different heating rate using thermogravimetric analysis (TGA). The kinetic parameters were calculated using Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) kinetic models at heating rates of 20, 30, and 50°C/min. The synergistic effect between waste tires and the agricultural residues was explored by calculating the deviation between the experimental and calculated values. The results showed the presence of a synergistic effect between the co-pyrolysis of waste tires and the residual agricultural residues. In the kinetic analysis, activation energies of waste tires, agricultural residues and their mixtures were calculated using the two models. The reaction followed a multistage reaction mechanism. The differential thermogravimetry (DTG) behavior of the mixture was similar to the weighted aggregate results of waste tire and agricultural waste samples, pyrolyzed separately. These results provide some insights on the combined treatment of waste tires and agricultural waste residues.