Li-Ca-Mg-Al-O固体碱催化制备生物柴油

发布时间：2018-04-26 14:05

  本文选题：复合氧化物 + 固体碱　； 参考：《精细石油化工》2017年01期

【摘要】：以锂、钙、镁、铝的硝酸盐为原料,以尿素为沉淀剂,采用沉淀焙烧的方法制备了Li-Ca-Mg-Al-O固体碱催化剂。采用单因素实验考察了制备条件对催化剂活性的影响,得到制备优化条件为:元素配比n(Li)∶n(Ca)∶n(Mg)∶n(Al)=1∶2∶1∶1,焙烧温度800℃,焙烧时间6.5h。将优化条件下制备的Li-Ca-Mg-AlO固体碱用于催化蓖麻油和甲醇的酯交换反应,在n(醇)∶n(油)=9,m(催化剂)∶m(油)=0.04,搅拌速率为550r/min,反应温度为65℃,反应时间为3h的条件下,蓖麻油转化率可达85.7%。采用Hammett指示剂滴定法、TG、BET、XRD及SEM对催化剂及其前驱体进行了表征。结果表明:Li-Ca-Mg-Al-O固体碱的碱强度为7.2~11.2;Li-Ca-Mg-Al类水滑石在温度超过800℃后质量不再随温度升高而变化;Li-Ca-Mg-Al-O固体碱催化剂比表面积为11.93m~2/g、孔容为0.031 7cm~3/g,主要由CaO、MgO及Al_2O_3三种晶体组成。
[Abstract]:Li-Ca-Mg-Al-O solid base catalyst was prepared by precipitation roasting with nitrate of lithium, calcium, magnesium and aluminum as raw materials and urea as precipitant. The influence of the preparation conditions on the activity of the catalyst was investigated by single factor experiment. The optimum preparation conditions were obtained as follows: the ratio of elements to elements is 1: 2: 1: 1, the calcination temperature is 800 鈩，

本文编号：1806339