A. Abdulloh and Siti Maryam and Nanik Siti Aminah and T. Triyono and Wega Trisunaryanti and M. Mudasir and Didik Prasetyoko (2014) Modification of Turen's Bentonite with A1C13 For Esterification of Palmitic Acid. Bulletin of Chemical Reaction Engineering & Catalysis, 9 (1). pp. 66-73. ISSN 1978-2993

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Abstract

Natural Turen’s bentonite has been purified, modified and applied as catalyst for palmitic acid esterifi-cation. Modification of natural Turen’s bentonite was conducted by cation exchange method using AlCl3 solution. Catalyst characterization was performed on X-ray Fluorescence, X-ray Diffraction, ni-trogen adsorption-desorption and infrared spectroscopy techniques. The catalytic activity test in the es-terification reaction of palmitic acid with methanol was conducted by bath at 65 °C with a variation of reaction time of 1, 2, 3, 4 and 5 h. Catalytic activity has been observed qualitatively using GC-MS and quantitatively by changes in acid number. The analysis showed the formation of Al3+-bentonite. Obser-vation on the elements has shown that the presence of calcium decreased from 10.2 to 4.17 %, with an increase of aluminium content from 9.9 to 13 %. Diffraction line at 2θ 5.7379º became 5.6489º, along with changes in d-spacing of 15.3895 to 15.6319 Å. The surface area increased from 83.78 to 91.26 m2/g, while Brönsted acid sites increased from 10.2 to 67.5 μmol/g and Lewis acid sites increased from 94.9 to 132 μmol/g. Furthermore, Al3+-bentonite has showed as active catalyst in the esterification re-action of palmitic acid with palmitic acid with conversion of 78.78 % for 7 h. © 2014 BCREC UNDIP. All rights reserved

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