Effects of biodiesel blends on the kinetic and thermodynamic parameters of fossil diesel during thermal degradation
2019
Li, Hui | Liu, Fengsheng | Ma, Xiaoling | Cui, Ping | Gao, Yan | Yu, Mingzhi | Guo, Min
To investigate the effects of biodiesel on thermal degradation for diesel, especially on its kinetic and thermodynamic parameters, three biodiesel–diesel blends, namely, B5, B20, and B50 were prepared on the basis of volume ratio and the thermal degradation was compared with that of fossil diesel. The experiments were conducted via thermogravimetry (TG) in combined with Fourier Transform infrared spectroscopy (FTIR) at linear heating rates of 5 K min⁻¹, 10 K min⁻¹, 15 K min⁻¹, and 20 K min⁻¹ with temperature range from 298 K to 873 K. In the meantime, generated products during the process were measured by FTIR in real time. Based on TG results, two model free methods of Friedman and Flynn–Wall–Ozawa were adopted to calculate the activation energy (Eₐ). As for the reaction order (n), it was determined by Avrami theory. In addition, thermodynamic parameters of enthalpy change (ΔH), Gibbs free energy (ΔG), and entropy change (ΔS) during thermal degradation were also calculated and compared.
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