Department of Safety, Health, & Environmental Engineering, National Yunlin University of Science and Technology, Douliou City, Yunlin County 64002, Taiwan, ROC.
Department of Safety, Health, & Environmental Engineering, National Yunlin University of Science and Technology, Douliou City, Yunlin County 64002, Taiwan, ROC.
Sci Total Environ. 2019 Apr 15;661:316-325. doi: 10.1016/j.scitotenv.2019.01.165. Epub 2019 Jan 15.
The present study focusses on synthesis and characterization of eggshell supported pyrolysis residue (char) as a heterogeneous base catalyst for transesterification of waste cooking oil (WCO). The influence of structural, compositional, and morphological properties on catalytic activity to optimize reaction time, methanol: oil molar ratio (6:1, 9:1, 12:1, 15:1 and 18:1), and catalyst concentration (10, 20, and 30 mass%) in biodiesel production from WCO were evaluated. The particle size distribution of pyrolysis residue, calcined eggshell, and the synthesized catalyst was in the range of 0.06 to 14 μm. The decomposition of eggshell revealed a two-stage mass loss from 300 to 900 °C indicating the formation of CaO and CO from CaCO. WCO methyl ester with higher conversion rate over 95% was observed at 65 °C using 10 mass% catalyst concentration with methanol to oil molar ratio of 12:1 in 3 h. The calorific value of WCO methyl ester was 38.4 MJ kg, with kinematic viscosity of 4.5 cSt, and had lower thermal stability when compared to raw WCO. The estimated apparent activation energy for WCO, and WCO methyl ester was 133.1 and 63.9 kJ mol, respectively. The synthesized catalyst displays improved surface area and catalytic activity in comparison with unsupported eggshell catalyst.
本研究专注于蛋壳负载热解残渣（char）的合成与表征，将其作为一种用于废食用油（WCO）酯交换的非均相碱催化剂。通过结构、组成和形态特性的影响，优化反应时间、甲醇与油的摩尔比（6:1、9:1、12:1、15:1 和 18:1）和催化剂浓度（10%、20%和 30%），以评价其在 WCO 生物柴油制备中的催化活性。热解残渣、煅烧蛋壳和合成催化剂的粒径分布在 0.06 至 14μm 之间。蛋壳的分解在 300 至 900°C 之间经历了两个阶段的质量损失，表明 CaCO3 形成了 CaO 和 CO。在 65°C 下，使用 10%质量浓度的催化剂和甲醇与油的摩尔比为 12:1 的条件下，反应 3 小时，WCO 的转化率超过 95%，生成了更高转化率的甲酯。与原始 WCO 相比，WCO 甲酯的热值为 38.4 MJ/kg，运动粘度为 4.5cSt，热稳定性更低。WCO 和 WCO 甲酯的表观活化能分别估计为 133.1 和 63.9kJ/mol。与无载体蛋壳催化剂相比，合成的催化剂显示出了更高的比表面积和催化活性。
