Alkali Modification and Pyrolysis of Rice Husks for Bioenergy Potential: A Kinetics Study DOI Creative Commons
Vianney Andrew Yiga, Michael Lubwama, Peter Wilberforce Olupot

et al.

Energy Science & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

ABSTRACT Rice husks are significantly creating environmental challenges in terms of air pollution because their unsustainable disposal methods. In this study, pyrolysis sodium hydroxide (NaOH) alkali‐modified rice using thermogravimetric analysis (TGA) was carried out to determine combustion and kinetic parameters at three different heating rates 20, 40, 50°C/min for application biofuels. Combustion performance analyzed from the results ignition temperature, burn‐out rates, flammability index, characteristic index. The increase rate 20°C 40°C further increased onset degradation, burnout, peak temperatures as observed by curve shifts right. This likely due a shorter reaction time when higher utilized, increasing temperature required degradation. Flammability index ranged between 0.8 × 10 −5 –1.1 %/min.°C 2 0.3 −8 –0.4 %/min/°C respectively, values decreased with since it takes longer transfer heat external environment interior husks, thereby hysteresis effect. average activation energies modified K85 ( kaiso ) K98 supa Kissinger–Akahira–Sunose (KAS) method were 104.5 kJ/mol 105.4 well 109.4 110.3 Ozawa–Flynn–Wall (OFW) method. Enthalpy, Gibbs free energy, Entropy changes ranges 103.9–105.0 kJ/mol, 160.8–167.5 0.09 kJ/mol.K, respectively. low energy barrier (≤ 7.0 kJ/mol) enthalpy indicated that husk initiation occurs easily can be transformed into general, findings work have confirmed feasibility potential source bioenergy.

Language: Английский

Alkali Modification and Pyrolysis of Rice Husks for Bioenergy Potential: A Kinetics Study DOI Creative Commons
Vianney Andrew Yiga, Michael Lubwama, Peter Wilberforce Olupot

et al.

Energy Science & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

ABSTRACT Rice husks are significantly creating environmental challenges in terms of air pollution because their unsustainable disposal methods. In this study, pyrolysis sodium hydroxide (NaOH) alkali‐modified rice using thermogravimetric analysis (TGA) was carried out to determine combustion and kinetic parameters at three different heating rates 20, 40, 50°C/min for application biofuels. Combustion performance analyzed from the results ignition temperature, burn‐out rates, flammability index, characteristic index. The increase rate 20°C 40°C further increased onset degradation, burnout, peak temperatures as observed by curve shifts right. This likely due a shorter reaction time when higher utilized, increasing temperature required degradation. Flammability index ranged between 0.8 × 10 −5 –1.1 %/min.°C 2 0.3 −8 –0.4 %/min/°C respectively, values decreased with since it takes longer transfer heat external environment interior husks, thereby hysteresis effect. average activation energies modified K85 ( kaiso ) K98 supa Kissinger–Akahira–Sunose (KAS) method were 104.5 kJ/mol 105.4 well 109.4 110.3 Ozawa–Flynn–Wall (OFW) method. Enthalpy, Gibbs free energy, Entropy changes ranges 103.9–105.0 kJ/mol, 160.8–167.5 0.09 kJ/mol.K, respectively. low energy barrier (≤ 7.0 kJ/mol) enthalpy indicated that husk initiation occurs easily can be transformed into general, findings work have confirmed feasibility potential source bioenergy.

Language: Английский

Citations

0