Preparation of biodiesel from rice bran fatty acids catalyzed by heterogeneous cesium-exchanged 12-tungstophosphoric acids

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• 作者：K. Srilatha^a ; Rekha Sree^a ; B.L.A. Prabhavathi Devi^b ; P.S. Sai Prasad^a ; R.B.N. Prasad^b ; N. Lingaiah^a ; ^{nakkalingaiah@iict.res.in}
• 关键词：Esterification ; Rice bran fatty acids ; Biodiesel ; 12-Tungstophosphoric acid ; Cesium salts
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：July, 2012
• 卷：116
• 期：Complete
• 页码：53-57
• 文件大小：290 K

摘要

Biodiesel synthesis from rice bran fatty acids (RBFA) was carried out using cesium exchanged 12-tungstophosphoric acid (TPA) catalysts. The physico-chemical properties of the catalysts were derived from X-ray diffraction (XRD), Fourier transform infrared (FTIR), temperature programmed desorption (TPD) of NH₃ and scanning electron microscopy (SEM). The characterization techniques revealed that the Keggin structure of TPA remained intact as Cs replaced protons. The partial exchange of Cs for protons resulted in an increase in acidity and the catalysts with one Cs⁺ (Cs₁H₂PW₁₂O₄₀) showed highest acidity. Under optimized conditions about 92%conversion of RBFA was obtained. The catalyst was reused for five times and retained of its original activity. Pseudo-first order model was applied to correlate the experimental kinetic data. Modified tungstophosphoric acids are efficient solid acid catalysts for the synthesis of biodiesel from the oils containing high FFA.