https://scholars.lib.ntu.edu.tw/handle/123456789/406433
標題: | Solid superacidic and superbasic catalysts for enhanced biodiesel production through sequential esterification and transesterification | 作者: | Chiang C.-L. Lin K.-S. Shu C.-W. Wu J.C.-S. Wu K.C.-W. Huang Y.-T. |
關鍵字: | Biodiesel;Catalysis;Resource recovery;Soild superacidic/superbasic catalyst;Transesterification | 公開日期: | 2017 | 卷: | 2017 | 期: | 25thEUBCE | 起(迄)頁: | 1307-1317 | 來源出版物: | European Biomass Conference and Exhibition Proceedings | 摘要: | Soybean oil containing free fatty acids (FFA, palmitic acid, 5.0 wt%) was converted to biodiesel by a two-step process in a catalytic fixed-bed batch reactor using three different catalysts. The solid superacidic SO 4 2- /ZrO 2 /Al 2 O 3 catalyst was prepared with 0.1-1.5 M H 2 SO 4 and calcined at 300-700 ¢XC. In addition, two solid superbasic catalysts, KF/CaO-Fe 3 O 4 and Na/NaOH/Al2O3, were synthesized with 5-25 wt% KF loading and 10-25 wt% NaOH, respectively, then calcined at 200-700 ¢XC. The efficiency of FFA removal by SO 4 2- /ZrO 2 /Al 2 O 3 in a 3 h reaction was much higher than Amberlyst IR 120 (80.0% compared to 30.0%), but lower than Amberlyst 15 (98.0%). As for biodiesel yield, optimal values of 83.0% and 100.0% were obtained using KF/CaO-Fe 3 O 4 and Na/NaOH/Al 2 O 3 , respectively. The transesterification mechanisms of soybean oil with FFA into biodiesel using solid superacid and superbasic catalysts were also proposed. We demonstrated the removal and conversion of FFA in soybean oil by first esterifying the oil over the SO 4 2- /ZrO 2 /Al 2 O 3 surface. The soybean oil was then converted into biodiesel via transesterification occurring at the surfaces of KF/CaO-Fe 3 O 4 and Na/NaOH/Al 2 O 3 . ? 2017, ETA-Florence Renewable Energies. All rights reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/406433 | ISSN: | 22825819 |
顯示於: | 化學工程學系 |
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