Chemical Kinetics and Thermodynamics Characteristic of Saudi Biomass Wastes Using Isoconversional and Independent Parallel Reaction Models

Using the TG/DTG technique, the pyrolysis and co-pyrolysis behavior and properties of biomass wastes of date kernel (DK) and fruit waste (FW) and their blends were examined at varying heating rates in an inert atmosphere. One of the main objectives of this study is to determine the activation energy (E), frequency factor (A), and reaction mechanism function (kinetic triplet). The E values were calculated for both individual and blended samples using the OFW, KAS, and ST isoconversional kinetic models. Additionally, the independent parallel reaction scheme (IPRS) with four pseudo-components is used to determine the kinetic parameters of this lignocellulosic biomass pyrolysis. The IPRS results demonstrated a high degree of agreement between modelled and experimental data. Additionally, the differences between the E values produced from IPRS and ΔH didn’t surpass ۵ kJ/mole. The degradation of biomass samples was observed to match the chemical reaction mechanism (C۸) model for both α = ۰.۱-۰.۵ and ۰.۵-۰.۹ ranges with high reliable values of R۲, according to the master plots approach. From ۲۰۰ to ۴۰۰ °C at β = ۳۰ °C /min, the synergistic impact was notable for ۲۵ and ۵۰% of FW in the blends; however, at β = ۲۰ °C /min, the remarkable effect appeared for both low and high temperatures and for the entire percentage of FW. Conversely, for T < ۴۰۰ °C for full percentages of FW in the blends, a substantial influence appears at β = ۴۰ °C /min; yet, for T > ۴۰۰ °C, the blends' FW concentrations of ۵۰ and ۷۵% exhibit noticeable effects. With an increase in heating rate (β), all pyrolysis characteristic parameters (CPI, Ddev and Rw) rose, and volatiles were produced more rapidly and steadily due to the tested samples' superior pyrolysis characteristics and stability (higher PI, Ddev and Rw).

کلیدواژه ها:

Fruit waste (FW) and date kernel (DK) ، Pyrolysis and co-pyrolysis ، IPRS ، Isoconversional kinetic methods ، Thermodynamics characteristic parameters ، Master plots method