The goal of this study was to look into the catalytic activity of KOH-modified CaO from eggshell as catalyst for the optimization of biodiesel production from used cooking oil (UCO), applying the Taguchi approach. The strong base catalyst (K/CE) was formulated by doping KOH on calcined chicken eggshell at various quantities (0–2.5 g), where 2 g of KOH doped on 5 g of calcined eggshell (2K/CE) and recalcined at 400 °C was found to represent the best catalyst formulation conditions. The optimal catalyst resulted in the maximum UCO biodiesel (UCOB) yield of 91.92 % at 70 °C for 1 h, using a 2K/CE dosage of 0.5 wt % and a methanol/UCO molar ratio of 15:1. The physicochemical properties of the optimal UCOB sample were in accordance with ASTM D6751 specifications, and gas chromatography-mass spectrometry analysis confirmed the presence of methyl esters at an amount of 97.65 wt %.

中文翻译：

---

田口实验设计方法优化废食用油的甲醇分解

本研究的目的是应用田口方法，研究来自蛋壳的 KOH 改性 CaO 作为催化剂的催化活性，以优化从废食用油 (UCO) 生产生物柴油。强碱催化剂（K/CE）是通过在煅烧鸡蛋壳上掺杂不同量（0-2.5 g）的KOH而配制的，其中2 g KOH掺杂在5 g煅烧蛋壳（2K/CE）上并在400°下重新煅烧发现 C 代表最佳的催化剂配制条件。最佳催化剂在 70°C 下 1 小时，使用 0.5 wt% 的 2K/CE 剂量和 15:1 的甲醇/UCO 摩尔比，获得最大 UCO 生物柴油 (UCOB) 产率为 91.92%。最佳UCOB样品的理化性质符合ASTM D6751规范，气相色谱-质谱分析证实甲酯的含量为97.65 wt%。