负载型固体碱催化制备生物柴油重复性能比较

发布时间：2018-03-23 20:23

本文选题：负载型固体碱　切入点：催化　出处：《中国油脂》2017年09期

【摘要】：采用共沉淀、浸渍及焙烧的方法制备了Ca O/Mg-Al-O及Ca O/Zn-Al-O固体碱催化剂;采用共沉淀、焙烧及研磨的方法制备了KF/Mg-Al-O及KF/Ca-Al-O固体碱催化剂。采用醇洗、干燥及焙烧的方法对使用过的催化剂进行活化处理后用于下一次实验。以蓖麻油和甲醇的酯交换反应为活性评价反应,考察了催化剂重复使用次数对催化剂活性的影响。应用Hammett指示剂滴定法、XRD技术对新催化剂及使用后经活化处理的催化剂进行了表征,并对催化过程中碱溶解流失和析出的甘油量、总甘油量进行了测定。结果表明:Ca O/Mg-Al-O、Ca O/Zn-Al-O、KF/Mg-Al-O和KF/Ca-Al-O固体碱催化剂第一次使用催化活性很好,第二次使用催化活性较差;新催化剂的碱量均比使用过的催化剂的碱量高得多;新催化剂的晶体结构和使用过的催化剂的晶体结构差别很小;新催化剂的碱溶解流失均比较大,且生成的甘油量均较多。
[Abstract]:CA O/Mg-Al-O and Ca O/Zn-Al-O solid base catalysts were prepared by coprecipitation, impregnation and roasting, and KF/Mg-Al-O and KF/Ca-Al-O solid base catalysts were prepared by coprecipitation, roasting and grinding. The reaction of transesterification of castor oil and methanol was used to evaluate the activity of the catalyst. The influence of the times of catalyst reuse on the activity of the catalyst was investigated. The new catalyst and the activated catalyst were characterized by Hammett indicator titration. The amount of glycerol lost and precipitated from alkali dissolution and precipitation during the catalytic process was determined. The results showed that the catalytic activity of Ca / O / Mg-Al-O / Ca / O / Zn-Al-O / Zn-Al-O / KF / Mg-Al-O and KF/Ca-Al-O solid base catalysts was very good for the first time and poor for the second time. The alkali content of the new catalyst is much higher than that of the used catalyst; the crystal structure of the new catalyst and that of the used catalyst are very small; the alkali dissolution loss of the new catalyst is larger and the amount of glycerol produced is more than that of the new catalyst.
【作者单位】：安顺学院贵州省教育厅功能材料与资源化学特色重点实验室;太原工业学院化学与化工系;
【基金】：贵州省科技厅三方联合基金项目(黔科合LH字[2016]7278) 安顺市科技创新平台建设计划项目(安市科平[2016]4号) 贵州省教育厅自科项目(黔教科2011054)
【分类号】：TE667

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