A novel α-Fe2O3/AlOOH(γ-Al2O3) nanocatalyst for efficient biodiesel production from waste oil: Kinetic and thermal studies

Mohamed Mokhatr Mohamed, W.A. Bayoumy, Hossam El-Faramawy, Wagdy El-Dogdog and Ashraf A. Mohamed

Renewable Energy, 2020, vol. 160, issue C, 450-464

Abstract: Different α-Fe2O3 loading (4–12 wt%) doped nanowires AlOOH/γ-Al2O3 catalysts are synthesized using a deposition hydrothermal technique and thoroughly characterized using XRD, SAED-TEM, FTIR, UV–Vis, N2 sorptiometry and XPS measurements. The 12 wt% α-Fe2O3/AlOOH(γ-Al2O3) catalyst presented the highest fatty acid methyl ester (FAME) Yield that comprised of 100% for virgin oil and 94.3% for the waste one, all performed under mild optimized conditions (60 °C, methanol to oil molar ratio = 6:1, 3 wt% catalyst, reaction rate 600 rpm and within 3 h reaction time). It also shows high recyclability without significant loss in activity because of the superior large surface area (323.3 m2/g), high number of acid sites (0.45 mmol g−1), deep pore volume (0.322 ml/g) and to the exposed active site planes (110) and (214) of α-Fe2O3. The kinetic constant (k = 0.016–0.02 min−1) and the activation energy (Ea = 57.4 kJ mol−1) of the reaction together with ΔH ‡ (59.4 kJ mol−1), ΔG ‡ (+95.9 kJ mol−1) and ΔS ‡ (- 0.108 kJ mol−1) values elaborate that the reaction is endothermic, non-spontaneous and obey an associative path. The fuel properties derived from cottonseed oil exhibited high quality biodiesel comparable to the international (ASTM) standards.

Keywords: Solid acid nanocatalyst; α-Fe2O3/AlOOH/γ-Al2O3; Biodiesel production; Transesterification; Waste oil (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:160:y:2020:i:c:p:450-464

DOI: 10.1016/j.renene.2020.07.006

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