Zn/Al复合氧化物催化剂用于菜籽油甲醇酯交换反应制备生物柴油  

Using Zn/Al Binary Metal Oxides in the Transesterification of Rapeseed Oil and Methanol for Biodiesel Production

作　　者：颜姝丽[1] 鲁厚芳[1] 汤贤龙[1] 梁斌[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2007年第6期76-80,162,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：教育部科学技术研究重大资助项目(307023)

摘　　要：固体催化剂用于酯交换反应制备生物柴油具有易分离、流程简单的优点,制备了Zn/Al水滑石,以其为前驱体经煅烧制得了Zn/Al复合氧化物酯交换催化剂。用XRD、TG/DTA、XPS、AAS、BET等技术对催化剂结构进行了表征。结果表明,大的比表面积、均匀的孔结构和活性组份ZnO的良好的分散状态可以提高Zn/Al复合氧化物催化剂的反应活性。经400℃煅烧8 h制得的Zn/Al复合氧化物催化剂,在200℃、3.3 MPa、油/醇质量比为7∶10、1.4(wt)%催化剂用量的条件下,在3 min内油脂转化率达到89.1%。Solid catalysts are easily separated from biodiesel product, and therefore using solid catalysts can greatly simplify the process of biodiesel production. Zn/Al hydrotalcite was prepared and it was served as the precursor of Zn/Al compound metal oxide catalyst. Calcining Zn/Al hydrotalcite at 400 ℃ for 10 h obtained the catalyst, which achieved a oil conversion as high as 89.1% within 3 minutes under the conditions of 200 ℃, 3.3 MPa, 70 g refined rapeseed oil, 100 g methanol, and 1.4 （wt） % catalyst dosage. Furthermore, XRD, TG/DTA, XPS, AAS and BET measurements were used in the characterization of the catalysts. The results show that a high specific surface area and an optimal pore structure are necessary in order to obtain a high dispersion of active component as well as a high activity.

关 键 词：生物柴油 Zn/Al水滑石 Zn/Al复合氧化物 

分 类 号：TQ645.8[化学工程—精细化工]