Valorization of hazard waste: Efficient utilization of white brick waste powder in the catalytic production of biodiesel from waste cooking oil via RSM optimization process

• Published in: Renewable energy 2022-11, Vol.200, p.1120-1133
• Main Authors: Abu-Ghazala, Abdelmoniem H., Abdelhady, Hosam H., Mazhar, Amina A., El-Deab, Mohamed S.
• Format: Article
• Language: English
• Subjects: Biofuel; Calcium diglyceroxide; CCD; Kinetic studies; Modelling; Techno-economic analysis
• ISSN: 0960-1481; 1879-0682
• DOI: 10.1016/j.renene.2022.10.045

The target of this study is to utilize hazardous white brick waste powder as a heterogeneous catalyst for biodiesel production through the transesterification process of waste cooking oil (WCO) and methanol. Physico-chemical characterization of the processed waste has been carried out using various techniques including TGA, XRD, FT-IR, BET surface area, FE-SEM & mapping EDX, XRF, and CO2-TPD. The influence of calcination temperature on the catalytic activity is studied. The optimization process of variable independent parameters i.e., catalyst loading, reaction temperature and time as well as alcohol:WCO molar ratio is performed via response surface methodology (RSM) through central composite design (CCD). Optimum conditions (biodiesel conversion = 92.7%) are: catalyst loading 1.3%; temperature 64 °C; methanol:WCO molar ratio of 5.5:1; and reaction time 139 min. Kinetic parameters, i.e., rate constant (k), activation energy (Ea = 25.95 kJ/mol) and thermodynamic parameters, i.e., ΔS# and ΔH# of −202.36 J/mol and +23.27 kJ/mol, respectively, are estimated. The reusability of the prepared catalyst is performed up to six consecutives cycles with marginal loss in activity. Physico-chemical properties of the prepared biodiesel are comparable with the ASTM D-6751 and EN-14214 standard ranges. [Display omitted]