Investigation of slow pyrolysis mechanism and kinetic modeling of Scenedesmus quadricauda biomass


Khan S. A., Ali I., Naqvi S. R., Li K., Mehran M. T., Khoja A. H., ...More

JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, vol.158, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 158
  • Publication Date: 2021
  • Doi Number: 10.1016/j.jaap.2021.105149
  • Journal Name: JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Analytical Abstracts, CAB Abstracts, Chemical Abstracts Core, Veterinary Science Database
  • Keywords: Scenedesmus quadricauda, Pyrolysis, Mechanism, Kinetics, CATALYTIC PYROLYSIS, PADDY HUSK, MICROALGAE, NITROGEN
  • Erciyes University Affiliated: Yes

Abstract

Bioenergy potential of microalage Scednedesmus quadricuda through pyrolysis was investigated using kinetic and thermodynamic analyses. From model-free isoconversional methods, the estimated average activation energies were 152.37 (+/- 20.93), 174.98 (+/- 22.38), and 153.00 (+/- 21.23) kJ/mol, using Friedman, OFW and advance Vyazovkin methods, respectively. Avrami-Erofeev's A1/4 reaction model was the most probable single-step re-action mechanism determined from the combined kinetic analysis. The activation energy profile, however, indicated a complex degradation process in the active pyrolysis zone. Two independent parallel reactions were considered in the active pyrolysis zone. Average activation energy for low temperature conversion was 77.95 (+/- 3.12) kJ/mol, pre-exponential coefficient 4.86E4 (+/- 2.24E4) s(-1), and n = 1.51 (+/- 0.10), whereas for high temperature conversion, the activation energy was 73.26 (+/- 17.93) kJ/mol, pre-exponential coefficient 1.32E3 (+/- 2.61E3) s(-1), and n = 1.21 (+/- 0.16). Thermodynamic analysis of pyrolysis in terms of enthalpy, Gibbs free energy, and entropy indicated the feasibility of conversion.