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A. Demirbas, “Progress and Recent Trends in Biofuels,” Progress in Energy and Combustion Science, Vol. 33, No. 1, 2007, pp. 1-18. doi:10.1016/j.pecs.2006.06.001

has been cited by the following article:

  • TITLE: Evaluation of Activation Energy and Thermodynamic Properties of Enzyme-Catalysed Transesterification Reactions

    AUTHORS: Ravindra Pogaku, Jegannathan Kenthorai Raman, Gujjula Ravikumar

    KEYWORDS: Activation Energy; Thermodynamic Properties

    JOURNAL NAME: Advances in Chemical Engineering and Science, Vol.2 No.1, December 31, 2011

    ABSTRACT: In this study, the activation energy and thermodynamic properties of immobilized enzyme catalysed transesterification reactions were evaluated based on the enzyme substrate transition theory. The activation energy for a enzyme catalysed biodiesel production system were found to be 4.25 (kcal/mole) for monoglyceride formation, 5.58(kcal/mole) for diglyceride formation and 5.50 (kcal/mole) for methyl ester formation respectively. The rate constants were found to be 3.2 × 1010(L/mol.sec) monoglyceride, 3.47 × 109 (L/mol.sec) for diglyceride and 3.93 × 109 (L/mol.sec) for methyl ester. Based on the present work and published literatures, the activation energy of enzyme-catalysed transesterification reactions were found to be lower than the chemical-catalysed and non-catalyzed transesterification reactions. The thermodynamic properties of immobilized enzyme-catalysed transesterification reaction were found to be Gibbs free energy (ΔG = –1.02 kcal/mol), enthalpy (ΔH = 544 cal/mol) and entropy (ΔS = 5.19 cal/Kmol).