稀土镧改性磷钨杂多酸盐催化油酸与甲醇酯化反应合成生物柴油活性研究  

Catalytic activity of La-modified phosphotungstic heteropoly acid salt in synthesis of biodiesel from esterification of methanol and oleci acid

作　　者：舒庆[1] 侯小鹏[1] 刘峰生[1] 唐国强[1] 许宝泉[1] 张彩霞[1] 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州34100

出　　处：《有色金属科学与工程》2016年第3期131-136,共6页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(21206062;21466013);江西省2014年度自然科学青年基金重大项目(20143ACB21018)

摘　　要：以H3PW12O40和La(NO3)3为原料,通过离子交换法制备一种稀土镧改性磷钨杂多酸盐催化剂.通过扫描电镜、红外光谱和X射线粉末衍射等表征方法,对合成的催化剂的物理及化学性能进行分析,进而通过以油酸和甲醇为反应物的酯化反应,对其催化活性进行研究.结果表明:稀土镧已经导入磷钨杂多酸的骨架结构,并与杂原子P形成配位键,有效提高磷钨杂多酸的比表面积和孔径;合成的催化剂具有完整的Keggin型结构;当反应温度为62℃,油酸与甲醇摩尔比为1∶6,反应时间为4.5 h,催化剂用量为反应物质量的2.5%,油酸的转化率可达88.0%.La-modified phosphotungstic heteropoly acid salt catalyst was prepared by using H3PW12O40 and La（NO3）3 as raw materials through the ion exchange method. The physical and chemical properties of the obtained-catalyst were analyzed with the employment of scanning electron microscopy, infrared spectroscopy and X-ray powder diffraction. The catalytic activity of the obtained-catalyst was studied in the esterification reaction with the oleic acid and methanol as raw materials. The results show that the rare earth lanthanum has been introduced into the skeleton structure of phosphotungstic heteropoly acid and formed new coordination bond with the heteroatom P, which effectively improved the specific surface area and pore size of phosphorus tungsten heteropoly acid; La-modified phosphotungstic heteropoly acid salt keeps the Keggin structure of phosphotungstic heteropoly acid completely. A yield of oleic acid methyl ester 88.0 % is obtained when the reaction temperature is 62 °C, the molar ratio of methanol and oleic acid is 1：6, reaction time is 4.5 h, and the mass ratio of catalyst to the reactants （oleic acid and methanol） is 2.5%.

关 键 词：稀土 镧 杂多酸盐 酯化反应 生物柴油 

分 类 号：TF111.52[冶金工程—冶金物理化学] TQ645.8[化学工程—精细化工]