The utilization of waste cooking oil (WCO) and bleached palm oil (BPO) for the production of biodiesel in the presence of hydrothermally treated calcium oxide (CaO) derived from waste chicken eggshells was investigated. Waste chicken eggshells were calcined at 850 °C and then hydrothermally treated at 120 and 140 °C to produce two sets of CaO catalysts. Hydrothermal treatment of the catalysts resulted in a decrease of the crystallite size from 47 to 30 and 28 nm at temperatures of 120 and 140 °C. The catalytic performance of the CaO catalysts was evaluated with WCO and BPO, respectively. WCO gave biodiesel yields of 82.7 and 83.1 % for CaO catalysts aged at 120 and 140 °C respectively. BPO gave 79.4 and 79.6 % yields, respectively, for the same set of catalysts.

中文翻译：

---

水热处理对生物柴油催化剂蛋壳氧化钙性能的影响

研究了在从废弃鸡蛋壳中提取的水热处理氧化钙 (CaO) 存在下，利用废弃食用油 (WCO) 和漂白棕榈油 (BPO) 生产生物柴油。废鸡蛋壳在 850 ℃下煅烧，然后在 120 和 140 ℃水热处理生产两组 CaO 催化剂。在 120 和 140 °C 的温度下，催化剂的水热处理导致微晶尺寸从 47 减小到 30 和 28 nm。分别用 WCO 和 BPO 评估 CaO 催化剂的催化性能。对于分别在 120 和 140 °C 老化的 CaO 催化剂，WCO 提供了 82.7 和 83.1% 的生物柴油产率。对于同一组催化剂，BPO 的产率分别为 79.4% 和 79.6%。