Kinetics and thermodynamics dataset of iron oxide reduction using torrefied microalgae for chemical looping combustion

• Main Authors: Ubando, Aristotle T., Chen, Wei Hsin, Ashokkumar, Veeramuthu, Chang, Jo Shu
• Format: text
• Published: Animo Repository 2020
• Subjects: Iron oxides; Ferric oxide; Chemical kinetics; Microalgae; Thermodynamics; Combustion; Mechanical Engineering
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/2613
• Institution: De La Salle University

The reduction of iron oxides transpires through the application of heat wherein a carbon source known as reductant is required. In order to design a chemical looping combustion using iron as an oxygen carrier and torrefied microalgae biomass as a reductant, the kinetics and thermodynamics dataset must be determined. Using the Arrhenius law of reaction, the kinetics dataset was obtained employing the three chemical reaction model such as the first order (C1), the reaction order 1.5 (C1.5), and the second-order (C2). The iron oxide reduction from hematite to metallic iron was sub-divided into three phases wherein phase 1 (Fe2O3 → Fe3O4) is from 365 °C to 555 °C, phase 2 (Fe3O4 → FeO) is from 595 °C to 799 °C, and phase 3 (FeO → Fe) is from 800 °C to 1200 °C. Two torrefied microalgae (Chlamydomonas sp. JSC4 and Chlorella vulgaris ESP-31) were considered as a reducing agent. The kinetics dataset comprise of the activation energy (E), pre-exponential factor (A), and the reaction rate (k) while the thermodynamic dataset consists of the change in enthalpy (ΔH), change in Gibbs energy (ΔG), and change in entropy (ΔS). These kinetics and thermodynamics parameters are essential in understanding the reaction mechanisms of the reduction process of iron oxides enabling process optimization and improvement. Current literature lacks the kinetics and thermodynamics datasets for the reduction of iron oxides using the two torrefied microalgae as reductants. This work provides these datasets which are useful for the design of reactors in chemical looping combustion. © 2020 The Author(s)