Thermo-kinetic Study of Arthrospira Platensis Microalgae Pyrolysis: Evaluation of Kinetic and Thermodynamics Parameters

Abstract

AbstractPyrolysis kinetics of microalgae Arthrospira platensis was investigated via thermogravimetric analysis in the nitrogen atmosphere at diverse heating rates of 20, 40, 60, 80 and 100 °C/min. Kissinger-Akahira-Sunose (KAS), Ozawa-Flynn-Wall (OFW), Friedman (FRM), Coats-Redfern (C-R) and Vyazovkin (VYZ) methods were applied on thermogravimetric data of microalgae to evaluate the different kinetic parameters such as activation energy, pre-exponential factor and thermodynamic parameters. The results obtained in thermal degradation process represents three main zones such as evaporation, active and passive pyrolysis zone. Activation energy obtained from KAS, OFW, Friedman, C-R and VYZ methods were 132.63, 175.65, 312.67, 216.87 and 149.26 kJ/mol, respectively. The average pre-exponential factor obtained through Kissinger approach were 4.045 × 1010, 1.16 × 1010, 7.89 × 109, 1.05 × 1010 and 1.157 × 1010 s–1 at 20, 40, 60, 80 and 100 °C/min, respectively. Experimental results reveal that the values of kinetic parameters from five different models free isoconversional methods are in good agreement and Arthrospira platensis can prove to be a promising alternating source for bio-fuel production.KeywordsArthrospira platensis microalgaeNon-isothermal pyrolysis kineticsActivation energyPre-exponential factorThermodynamic parameters