In this study, biodiesel synthesis from waste cooking oil (WCO) using waste oyster shells derived catalyst (CaO-based catalyst) as a sustainable based heterogeneous catalyst under a microwave heating system technology was investigated. The CaO-based catalysts were characterized by Fourier Transform-Infrared (FTIR), X-ray diffraction (XRD), Electronic Data System (EDS) and Brunauer-Emmett-Teller (BET) measurements. Under optimized conditions, this study has produced tentative results with considerable performances in relations to biodiesel synthesis as follows: (1) the intensification in relation to reaction time from 120 to 180 min has significantly increases the biodiesel yield, which declines with a more intensification to 120 min; (2) the synthesis of biodiesel in this study has proved to increase with an upsurge reaction of power; (3) whereas 180 min reaction time with 800 W microwave power, a methanol-to-oil molar ration of 9:1, a reaction temperature of 65 °C; and 6 wt% catalyst concentration was revealed to be optimal and perfect reaction conditions for this present research work. The highest biodiesel yield was recorded at 87.3% in this study. Whereas the activation energy (E_a) for the catalyzed transesterification reaction was found to be 9.56 kJ/mol. In a nutshell, waste oyster shells were recycled as a sustainable base heterogeneous catalyst to synthesize new biodiesel from WCO, which can be used in diesel engines to address air pollution, especially pollutant emissions from diesel automobiles.

在这项研究中，研究了在微波加热系统技术下，利用废牡蛎壳衍生催化剂（CaO基催化剂）作为可持续的非均相催化剂，从废食用油（WCO）中合成生物柴油。基于CaO的催化剂通过傅立叶变换红外（FTIR），X射线衍射（XRD），电子数据系统（EDS）和Brunauer-Emmett-Teller（BET）测量来表征。在最佳条件下，这项研究产生了与生物柴油合成相关的初步结果，其性能表现如下：（1）与反应时间120至180分钟有关的强化显着提高了生物柴油的产率，而随着强化程度的增加，生物柴油的产率下降。 120分钟; （2）这项研究证明生物柴油的合成随着功率的高潮反应而增加；（3）在800W微波功率下反应时间为180分钟，甲醇与油的摩尔比为9：1，反应温度为65℃；对于本研究工作而言，催化剂浓度为6％（重量）是最佳和理想的反应条件。在这项研究中，最高的生物柴油产率为87.3％。而活化能（催化的酯交换反应的E _a）为9.56 kJ / mol。简而言之，废牡蛎壳被回收利用作为可持续的基础非均相催化剂，从WCO合成新的生物柴油，该柴油可用于柴油发动机以解决空气污染，特别是柴油汽车的污染物排放。