Gasification kinetics of waste tire-char with CO2 in a thermobalance reactor

The effects of gasification temperature (850–1000°C) and partial pressure of CO2 (0.3–1.0 atm) on gasification rate of tire-char/CO2 have been determined in a thermobalance reactor. The gasification rate was found to be independent of char size for sizes less than 0.65 mm and initial sample mass less than 1.0 g. Among the tested models, the modified volume reaction model is best for predicting our conversion data. The kinetic parameters (activation energy, pre-exponential factor and reaction order) are determined on the basis of a modified volume-reaction model. From the Arrhenius plot (km vs 1/T), the activation energy and the pre-exponential factor are found to be 57.06 kcal/mol and 1.49 × 108/min, respectively. The reaction order is found to be 0.68 with respect to CO2 partial pressures of 0.3–1.0 atm at 950°C. The gasification reaction rate of tire-char/CO2 may be expressed as dX/dt = (1.49 × 108) exp(−57,060/RT)(PCO2) 0.68(1-X).