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<p>The present problems facing our universe include global warming and the depletion of fossil fuels, but these issues may be alleviated by discovering alternate, sustainable, and renewable resources. In this study, proximate analysis, higher heating value (HHV), and kinetic and thermodynamic parameters of teff straw were tested using thermogravimetric analysis (TGA) at three different heating rates to estimate its bioenergy potential. Furthermore, model-fitting methods like the Coats-Redfern (CR) model, as well as model-free approaches like Kissinger–Akahira–Sunose (KAS) and Ozawa-Flynn-Wall (OFW), were used to investigate the kinetic parameters. With the kinetic parameters obtained from the model-free approaches, the thermodynamic characteristics were also calculated, notably the Gibbs free energy (∆G), the change in enthalpy (∆H), and the entropy change (∆S). The moisture content, volatile matter, fixed carbon, ash content, and HHV of teff straws were 6.33%, 75.12%, 13.39%, 5.16%, and 18.01&#xa0;MJ/kg respectively. Teff straw’s average activation energy for KAS and OFW was 80.14 and 86.23&#xa0;kJ/mole, respectively. Additionally, for heating rates of 15, 20, and 25&#xa0;°C/min, respectively, the Coats-Redfern model yields 44.83, 43.67, and 71.13&#xa0;kJ/mole for diffusion and 64.26, 62.56, and 82.70&#xa0;kJ/mole for reaction order models. The variation of activation energy and the change in enthalpy was low, which showed promising formation of product, and a low barrier of energy.</p> Graphical abstract <p></p>

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Pyrolysis kinetics, reaction mechanisms, and thermodynamic parameter analysis of teff straw as a bioenergy potential resource in Ethiopia

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Tesfa Nega Gesese,
  • Eshetu Getahun,
  • Alelign Anmaw Getahun

摘要

The present problems facing our universe include global warming and the depletion of fossil fuels, but these issues may be alleviated by discovering alternate, sustainable, and renewable resources. In this study, proximate analysis, higher heating value (HHV), and kinetic and thermodynamic parameters of teff straw were tested using thermogravimetric analysis (TGA) at three different heating rates to estimate its bioenergy potential. Furthermore, model-fitting methods like the Coats-Redfern (CR) model, as well as model-free approaches like Kissinger–Akahira–Sunose (KAS) and Ozawa-Flynn-Wall (OFW), were used to investigate the kinetic parameters. With the kinetic parameters obtained from the model-free approaches, the thermodynamic characteristics were also calculated, notably the Gibbs free energy (∆G), the change in enthalpy (∆H), and the entropy change (∆S). The moisture content, volatile matter, fixed carbon, ash content, and HHV of teff straws were 6.33%, 75.12%, 13.39%, 5.16%, and 18.01 MJ/kg respectively. Teff straw’s average activation energy for KAS and OFW was 80.14 and 86.23 kJ/mole, respectively. Additionally, for heating rates of 15, 20, and 25 °C/min, respectively, the Coats-Redfern model yields 44.83, 43.67, and 71.13 kJ/mole for diffusion and 64.26, 62.56, and 82.70 kJ/mole for reaction order models. The variation of activation energy and the change in enthalpy was low, which showed promising formation of product, and a low barrier of energy.

Graphical abstract