Study on the Pyrolysis Kinetics and Mechanisms of the Tread Compounds of Silica-Filled Discarded Car Tires

Abstract

The disposal of used automobile tires is a major waste concern. Simply stacking tires and allowing them to decompose will harbor breeding mosquitoes that spread viruses, whereas burning them will release acidic and toxic gases. Therefore, one viable option is pyrolysis, where elevated temperatures are used to facilitate the decomposition of a material. However, the lack of theoretical support for pyrolysis technology limits the development of the pyrolysis industry when it comes to discarded tires. The purpose of this research is to put forward a brand-new multi-kinetic research method for studying materials with complex components through the discussion of various kinetic research methods. The characteristic of this kinetic research method is that it is a relatively complete theoretical system and can accurately calculate the three kinetic factors considered during the pyrolysis of multicomponent materials. The results show that the multi-kinetic research method can obtain the kinetic equation and reaction mechanism for the pyrolysis of tires with high accuracy. The pyrolysis process of this compound was divided into two stages, Reaction I and II, where the kinetic equation of Reaction I was f ( α ) = 0.2473 α − 3.0473 , with an activation energy of 155.26 kJ/mol and a pre-exponential factor of 5.88 × 109/min. Meanwhile, the kinetic equation of Reaction II was f ( α ) = 0.4142 ( 1 − α ) [ − ln ( 1 − α ) ] − 1.4143 , while its activation energy was 315.40 kJ/mol and its pre-exponential factor was 7.86 × 1017/min. Furthermore, based on the results of the research analysis, the reaction principles corresponding to Reaction I and Reaction II in the pyrolysis process of this compound were established.

A “Wastes-Treat-Wastes” Technology: Role and Potential of Spent Fluid Catalytic Cracking Catalysts Assisted Pyrolysis of Discarded Car Tires

“…The Starink equation (Equation (3)) in the equal conversion method is considered to be more accurate than the FWO method and the KAS method when solving the activation energy [ 46 , 47 ]. Therefore, the Starink method was used in this study.…”

“…where α is the pyrolysis conversion rate, T is the pyrolysis temperature (K), β is the heating rate (K/min), A, E, and R are pre-exponential factors (s −1 ), activation energy (J/mol), and general gas constant (J/(mol•K)), respectively, f (α) is a reaction mechanism function that controls the reaction process, and m 0 , m, and m ∞ are the initial mass, transient mass, and final mass (mg) of the sample during pyrolysis, respectively. The Starink equation (Equation ( 3)) in the equal conversion method is considered to be more accurate than the FWO method and the KAS method when solving the activation energy [46,47]. Therefore, the Starink method was used in this study.…”

Investigation of Non-Isothermal Kinetics and Thermodynamic Parameters for the Pyrolysis of Different Date Palm Parts

“…The pre-exponential factor is heavily linked with the kinetic equation and the activation energy. Therefore, to accurately determine A and to avoid the introduction of unknowns, the equation used must involve a kinetics model [58]. Thus, the choice of the FWO, KAS, and Starink model free methods for this research.…”

Biochar Synthesis from Mineral- and Ash-Rich Waste Biomass, Part 1: Investigation of Thermal Decomposition Mechanism during Slow Pyrolysis

“…The inorganics (such as silicates) in SS become random endothermic nucleation sites from where organic macromolecules undergo pyrolysis along a one-dimensional route. This reduces its Eα compared to AD (during active pyrolysis), despite having similar holocellulose content [115]. Until MPT, the active pyrolysis of BP is slowest (lowest pyrolytic reactivity due to high activation energy) [116] compared to AD and SS, which possess more inorganic species.…”