PDF(Pubmed)
Abstract：
Burning fossil fuels causes toxic gas emissions to increase, therefore, scientists are trying to find alternative green fuels. One of the important alternative fuels is biodiesel. However, using eco-friendly primary materials is a main factor. Sustainable catalysts should have high performance, good activity, easy separation from reaction cells, and regenerability. In this study, to solve the mentioned problem NaOH@Graphene oxide-Fe3O4 as a magnetic catalyst was used for the first time to generate biodiesel from waste cooking oil. The crystal structure, functional groups, surface area and morphology of catalyst were studied by XRD, FTIR, BET, and FESEM techniques. The response surface methodology based central composite design (RSM-CCD) was used for biodiesel production via ultrasonic technique. The maximum biodiesel yield was 95.88% in the following operation: 10.52:1 molar ratio of methanol to oil, a catalyst weight of 3.76 wt%, a voltage of 49.58 kHz, and a time of 33.29 min. The physiochemical characterization of biodiesel was based to ASTM standard. The magnetic catalyst was high standstill to free fatty acid due to the five cycle\'s regeneration. The kinetic study results possess good agreement with first-order kinetics as well as the activation energy and Arrhenius constant are 49.2 kJ/min and 16.47 * 1010 min-1, respectively.
摘要：
燃烧化石燃料会导致有毒气体排放增加，因此,科学家们正试图寻找替代的绿色燃料。重要的替代燃料之一是生物柴油。然而,使用生态友好的原材料是一个主要因素。可持续催化剂应该具有高性能，好活动,容易从反应细胞中分离，和可再生性。在这项研究中,为了解决上述问题，首次使用NaOH@氧化石墨烯-Fe3O4作为磁性催化剂从废弃食用油中生产生物柴油。晶体结构，功能组，用XRD研究了催化剂的比表面积和形貌,FTIR,BET,和FESEM技术。基于响应面方法的中心复合设计（RSM-CCD）用于通过超声技术生产生物柴油。在以下操作中，最大生物柴油收率为95.88％：甲醇与油的摩尔比为10.52：1，催化剂重量为3.76wt%，电压为49.58kHz，和33.29分钟的时间。生物柴油的物理化学表征基于ASTM标准。由于五个循环的再生，磁性催化剂对游离脂肪酸高度静止。动力学研究结果与一级动力学具有良好的一致性，活化能和阿伦尼乌斯常数分别为49.2kJ/min和16.47*1010min-1。
