Thermal degradation properties, kinetic, thermodynamic and reaction mechanism of pyrolysis of biomass shells: pistachio, almond, walnut and hazelnut as bioenergy potential

SARAÇOĞLU M., Coruh M.

BIOMASS CONVERSION AND BIOREFINERY, vol.14, no.24, pp.32427-32452, 2024 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 14 Issue: 24
  • Publication Date: 2024
  • Doi Number: 10.1007/s13399-023-05052-5
  • Journal Name: BIOMASS CONVERSION AND BIOREFINERY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Page Numbers: pp.32427-32452
  • Keywords: Biomass, Thermogravimetric, Degradation, Pyrolysis, Thermodynamic, Reaction mechanism
  • Ataturk University Affiliated: Yes

Abstract

The study investigates thermal degradation behaviors of pistachio (PS), almond (AS), walnut (WS), and hazelnut (HS) shells that are vegetal biomass sources using thermogravimetric analysis (TGA/DTG) methods and under high temperatures. The study was conducted in nitrogen at 298-1173 K heat intervals, at 5, 10, 20, and 25 K.min-1 heating rates. Using data achieved as a result of thermal characterization procedures, model-free Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), and model-based Coats-Redfern (CR) methods are used to investigate kinetic and thermodynamic parameters including Ea, Delta H, Delta S, Delta G, and pyrolysis reaction mechanism. Two regions in (0.1 <= alpha <= 0.5) and (0.55 <= alpha <= 0.9) intervals are created based on the change of Ea values of pistachio, almond, and hazelnut shells based on alpha. The best model in Region I was determined to be one of the diffusion (D) models while in Region II, it was determined to be one of the nth-degree chemical reaction (F) models.