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ZnO catalyzed transesterification of Madhuca indica oil in supercritical methanol

Lamba, N and Gupta, R and Modak, JM and Madras, G (2019) ZnO catalyzed transesterification of Madhuca indica oil in supercritical methanol. In: Fuel, 242 . pp. 323-333.

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Official URL: https://doi.org/10.1016/j.fuel.2019.01.044


An integrated pathway (heterogeneous catalyst with supercritical pathway) was studied to develop a most viable route for the synthesis of fatty acid methyl esters useful as biodiesel. Madhuca indica (Mahua) oil was transesterified using supercritical methanol and ZnO at 523 K, 10 MPa and molar ratio of 40:1 (alcohol:oil). ZnO was synthesized by solution combustion using various fuels (urea, glycine, lactose, oxalyl dihydrazide, ascorbic acid (AA)). Also, different morphologies of ZnO (nanorods (NR), nanoflowers, nanoparticles, nanospheres) were obtained via hydrothermal, precipitation, sonochemical and sol-gel synthesis. Pseudo first order rate constants ranging from (3.46 to 16.7) × 10−4 s−1 (>0.99 × 10−4 s−1 for uncatalyzed reaction) at 523 K, 10 MPa were obtained. ZnO-AA (solution combustion) and ZnO-NR (hydrothermal) were found to be the most active catalysts. Activation energies of 42 kJ/mol and 17 kJ/mol (<75 kJ/mol for uncatalyzed reaction) were obtained with ZnO-AA and ZnO-NR indicating the superiority of the integrated process.

Item Type: Journal Article
Publication: Fuel
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to Elsevier Ltd.
Keywords: Activation energy; Amino acids; Ascorbic acid; Catalysts; Combustion; Fatty acids; Hydrothermal synthesis; II-VI semiconductors; Methanol; Molar ratio; Morphology; Nanorods; Precipitation (chemical); Rate constants; Sol-gels; Synthetic fuels; Transesterification; Urea; Zinc oxide, FAMEs; Fatty acid methyl ester; Heterogeneous catalyst; Mahua oil; Pseudo first order rate constants; Solution combustion; Supercritical methanol; Uncatalyzed reactions, Oxide minerals
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 16 Dec 2022 09:06
Last Modified: 16 Dec 2022 09:06
URI: https://eprints.iisc.ac.in/id/eprint/78401

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