This study demonstrated the performance of the sugarcane bagasse ash (SCBA) impregnated with calcium oxide (CaO) as a novel heterogeneous basic catalyst in biodiesel production. The SCBA was prepared by calcination for 2 h at 500 to 800 °C and impregnated with CaO loadings (10 to 40 wt.%). The prepared SCBA/CaO catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), temperature programmed desorption of carbon dioxide (TPD-CO₂), thermal gravimetric analysis (TGA), X-ray fluorescence (XRF) and Brunauer-Emmett-Teller (BET) surface characteristics. A series of transesterification reactions were conducted to evaluate the performance of the catalysts. As a result, highest FAME yield of 93.8% was obtained by using SCBA_600°C CaO_(40%) catalyst at 20:1 methanol-to-oil molar ratio, reaction temperature of 65 °C, with 6 wt.% catalyst in 3 h. Besides, the catalyst can be reused up to 5 reaction cycles with biodiesel yield of 93.0% and 70.3% at first and fifth cycles, respectively. In this work, it was found that the natural SiO₂ in the SCBA has a significant role to enhance the catalytic performance and reduce the catalyst’s deactivation drawback by minimizing the leaching of active sites.

中文翻译：

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富含SiO 2的甘蔗渣蔗糖灰催化棕榈油酯交换反应

这项研究表明，在生物柴油生产中，用氧化钙（CaO）浸渍的甘蔗渣（SCBA）作为新型多相碱性催化剂的性能。通过在500至800°C下煅烧2小时并用CaO负载量（10至40 wt。％）浸渍来制备SCBA。使用傅里叶变换红外光谱（FTIR），扫描电子显微镜（SEM），X射线衍射（XRD），程控二氧化碳脱附（TPD-CO ₂），热重分析（TGA）对制得的SCBA / CaO催化剂进行表征），X射线荧光（XRF）和Brunauer-Emmett-Teller（BET）表面特性。进行了一系列的酯交换反应以评估催化剂的性能。结果，使用SCBA可获得93.8％的最高FAME产率甲醇与油的摩尔比为20：1的_600°C CaO _（40％）催化剂，反应温度为65°C，3小时内催化剂含量为6％。此外，该催化剂可重复使用多达5个反应周期，在第一和第五个循环中生物柴油的收率分别为93.0％和70.3％。在这项工作中，发现SCBA中的天然SiO ₂在通过最小化活性位的浸出来增强催化性能和减少催化剂失活缺陷方面具有重要作用。