Methyl Oleate Synthesis by TiO2 Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics

Welter Gabas, Rosilene A., Santana, Harrson, de la Torre, Lucimara G., Robertson, Mark, Pereira Taranto, Osvaldir, and Oelgemoeller, Michael (2022) Methyl Oleate Synthesis by TiO2 Photocatalytic Esterification of Oleic Acid: Optimisation by Response Surface Quadratic Methodology, Reaction Kinetics and Thermodynamics. ChemPhotoChem, 6 (7). e202200007.

[img]
Preview
PDF (Published Version) - Published Version
Available under License Creative Commons Attribution.

Download (1MB) | Preview
View at Publisher Website: https://doi.org/10.1002/cptc.202200007
 
114


Abstract

Methyl oleate, an example of a FAME (fatty acid methyl ester), was produced by oleic acid (OA) photoesterification with TiO2 and UVA light. Different parameters were evaluated and optimised: catalyst pretreatment, temperature (25–65°C), catalyst loading (1–30 % w/wOA) and oleic acid : alcohol molar ratio (1 : 3–1 : 55). Response surface quadratic methodology obtained by central composite rotational design (RSM-CCRD) was used to evaluate the main operational conditions of the photoesterification process. A high conversion of 98 % (±0.8) at 55 °C, 20 % TiO2 (w/wOA), and 1(OA) : 55(methanol) molar ratio was achieved. The photoesterification mechanism is furthermore proposed. The Langmuir-Hinshelwood kinetic model considered the forward and backward reaction as first-order fits with the best accuracy (R2 of 0.997). The thermodynamic results (ΔG338.15K=−20.75 kJ/mol, ΔH=13.75 kJ/mol, and ΔS=0.47 kJ/mol.K) indicate that the operating conditions are important, both to supply the energy requirement of the reaction, but also to increase the miscibility of the reactants.

Item ID: 75553
Item Type: Article (Research - C1)
ISSN: 2367-0932
Keywords: photocatalysis; TiO2; biodiesel; photoesterification
Copyright Information: © 2022 The Authors. ChemPhotoChem published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cite
Funders: James Cook University (JCU)
Projects and Grants: JCU Competitive Research Training Grant 2021
Date Deposited: 25 Jul 2022 21:40
FoR Codes: 34 CHEMICAL SCIENCES > 3405 Organic chemistry > 340505 Physical organic chemistry @ 40%
34 CHEMICAL SCIENCES > 3405 Organic chemistry > 340504 Organic green chemistry @ 40%
34 CHEMICAL SCIENCES > 3405 Organic chemistry > 340503 Organic chemical synthesis @ 20%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280105 Expanding knowledge in the chemical sciences @ 100%
Downloads: Total: 114
Last 12 Months: 76
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page