Four types of green alkali modified clinoptilolite (K, Na, Ca, and Mg) were prepared using green tea extracts as novel types of eco-friendly heterogeneous basic catalysts in the transesterification of commercial waste cooking oil into biodiesel. The modified products displayed significant enhancement in the total basicity, surface area, ion exchange capacity, and the morphological properties. The modified samples of K/clinoptilolite (K/Clino), Na/clinoptilolite (Na/Clino), Ca/clinoptilolite (Ca/Clino), and Mg/clinoptilolite (Mg/Clino) showed promising catalytic activities achieving biodiesel yields of 93.6%, 95.2%, 96.4%, and 98.7%, respectively. The best yields were recognized using 4 wt, % as catalysts loading, 16:1 as methanol-to waste oil molar ratio, and at 70 °C as temperature. The best transesterification intervals were identified at 120 min, 120 min, 180 min, and 150 min for K/Clino, Na/Clino, Ca/Clino, and Mg/Clino, respectively. The modified products also demonstrated high reusability properties and the resulted biodiesel in their transesterification systems are of technical properties within the accepted limits of EN 14214 and ASTM D-6751 standards.

使用绿茶提取物制备四种类型的绿色碱改性斜发沸石（K，Na，Ca和Mg），将其作为新型类型的生态友好型非均相碱性催化剂，用于将商业废食用油转化为生物柴油。改性产物在总碱度，表面积，离子交换容量和形态学性质上显示出显着增强。改性的K /斜发沸石（K / Clino），Na /斜发沸石（Na / Clino），Ca /斜发沸石（Ca / Clino）和Mg /斜发沸石（Mg / Clino）的改性样品显示出令人鼓舞的催化活性，实现了93.6％的生物柴油收率，95.2％，96.4％和98.7％。使用4 wt。％作为催化剂负载量，16：1作为甲醇与废油的摩尔比以及在70°C作为温度，可以确认出最佳的收率。对于K / Clino，Na / Clino，Ca / Clino和Mg / Clino，分别在120分钟，120分钟，180分钟和150分钟处确定了最佳的酯交换间隔。改性产品还显示出高可重复使用性，其酯交换体系中所得生物柴油的技术性能在EN 14214和ASTM D-6751标准的公认范围内。