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https://open.uns.ac.rs/handle/123456789/14758
Title: | Kinetics of biodiesel synthesis from sunflower oil over CaO heterogeneous catalyst | Authors: | Vujicic D. Comic D. Zarubica A. Mićić, Radoslav Boskovic G. |
Issue Date: | 1-Jan-2010 | Journal: | Fuel | Abstract: | Calcium oxide as a heterogeneous catalyst was investigated for its effect on the biodiesel synthesis from refined sunflower oil. Experiments were carried out using a commercial bench stirred tank reactor of 2 dm3 volume, at 200 rpm, with a methanol to oil ratio 6 to 1 and 1 mas.% catalyst loading as constant parameters. Ester yields were followed as a function of temperature (60-120 °C), pressure (1-15 bars) and reaction time (1.5-5.5 h). The temperature of 100 °C was found to be optimal for the maximum (91%) conversion to methyl esters, while pressure had a positive impact up to 10 bars at 80 °C. The catalyst activation in air leading to the formation of strong basic sites was found to occur at 900 °C. Catalyst particle coalescence took place during the reaction, giving a gum-like structure, and resulted in a significant catalyst deactivation. The pseudo-first order reaction was established, with a "knee" at 80 °C in the Arrhenius plot separating the kinetic and diffusion regimes. During the reaction progress, an activation energy decrease from 161 to 101 kJ/mol, and from 32 to (-3) kJ/mol, was found for the kinetic and diffusion regimes, respectively. © 2010 Elsevier Ltd. All rights reserved. | URI: | https://open.uns.ac.rs/handle/123456789/14758 | ISSN: | 162361 | DOI: | 10.1016/j.fuel.2009.11.043 |
Appears in Collections: | TFZR Publikacije/Publications |
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