Co-pyrolysis of petroleum coke and banana leaves biomass: Kinetics, reaction mechanism, and thermodynamic analysis

• Published in: Journal of environmental management Vol. 301; p. 113854
• Main Authors: Singh, Rajnish Kumar, Patil, Trilok, Pandey, Deeksha, Tekade, Shyam P., Sawarkar, Ashish N.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2022
• Subjects: Banana leaves biomass; Co-pyrolysis; Kinetics; Petroleum coke; Synergistic effect; Thermodynamics; Thermodynamics; Co-pyrolysis; Kinetics; Synergistic effect; Banana leaves biomass; Petroleum coke
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2021.113854

Insights into thermal degradation behaviour, kinetics, reaction mechanism, possible synergism, and thermodynamic analysis of co-pyrolysis of carbonaceous materials are crucial for efficient design of co-pyrolysis reactor systems. Present study deals with comprehensive kinetics and thermodynamic investigation of co-pyrolysis of petroleum coke (PC) and banana leaves biomass (BLB) for realizing the co-pyrolysis potential. Thermogravimetric non-isothermal studies have been performed at 10, 20, and 30 °C/min heating rates. Synergistic effect between PC and BLB was determined by Devolatilization index (Di) and mass loss method. Kinetic parameters were estimated using seven model-free methods. Standard activation energy for PC + BLB blend from FWO, KAS, Starink, and Vyazovkin methods was ≈165 kJ/mol and that from Friedman and Vyazovkin advanced isoconversional methods was ≈171 kJ/mol. The frequency factor calculated for the blend from Kissinger method was found to be in the range of 106-1016s−1. Devolatilization index (Di) showed synergistic effect of blending. The data pertaining to co-pyrolysis was found to fit well with R2 (second order) and D3 (three dimensional) from Z(α) master plot. Thermodynamic parameters, viz. ΔH ≈ 163 kJ/mol and ΔG ≈ 151 kJ/mol were calculated to determine the feasibility and reactivity of the co-pyrolysis process. The results are expected to be useful in the design of petcoke and banana leaves biomass co-pyrolysis systems. [Display omitted] •First comprehensive report on co-pyrolysis of PC and BLB through TG experiments.•≈32–37% reduction in Ea was observed for co-pyrolysis of PC + BLB vis-a-vis pyrolysis of PC alone.•ΔH ≈ 163 kJ/mol & ΔG ≈ 151 kJ/mol proves feasibility and spontaneity of co-pyrolysis.•Z-Master plots predicted R2 & D3 as plausible reaction models for PC + BLB co-pyrolysis.