摘要
采用离子交换法制备了一系列磷钨酸根插层Zn-Ti水滑石,利用XRD、FTIR、SEM对所制催化剂进行了表征。结果表明,磷钨酸根插层锌钛水滑石后仍保持原有的骨架结构。用制备的类水滑石催化脂肪酸甲酯环氧化反应,考察了所制催化剂的催化性能。当n(过氧化氢)∶n(原料双键)=1.5∶1,催化剂用量为脂肪酸甲酯质量的7.0%,在70℃下反应7 h时,脂肪酸甲酯转化率可达90.6%,环氧化产物选择性可达86.0%,优于Zn-Ti水滑石,其对脂肪酸甲酯环氧化反应显示出较高的催化活性。插层水滑石重复使用5次后,催化性能仍较稳定。
the ion-exchange method. The structures of samples were characterized by means of XRD, FI＇IR, and SEM. The results show that no significant structural change of LDH was observed after intercalation. The epoxidation of fatty acid methyl ester reactions were carried out over the catalyst samples. It was found that,90. 6% conversion of fatty acid methyl ester and 86. 0% selectivity to epoxidation product could be obtained at the reaction temperature 70 ℃, reaction time 7 h, n （ H： 02 ） ： n （ double bond） = 1.5： 1, and catalyst dosage 7.0% （based on the weight of fatty acid methyl ester）. The catalytic performance of phosphotungstic acid pillared Zn-Ti hydrotalcites was better than that of Zn-Ti LDH respectively. The novel phosphotungstic acid pillared Zn-Ti hydrotalcites catalysts revealed good catalytic performance to epoxidation of fatty acid methyl ester reactions. Furthermore, the pillared hydrotalcites showed a good repeatability after 5 times reuse.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2014年第5期586-590,602,共6页
Fine Chemicals
基金
江苏省2013年大学生实践创新训练计划省级重点项目(201310291041Z)~~
关键词
锌钛水滑石
磷钨酸
脂肪酸甲酯
环氧化反应
催化与分离提纯技术
Zn-Ti hydrotalcites
phosphotungstic acid
fatty acid methyl ester
epoxidation
catalysis,separation and purification technology
