Abstract: Lanthanum oxide/dodecyl sulfate mesoporous material (LaOS) was synthesized by hydrothermal method with SDS as template and ethylenediamine as medium. The experimental results indicate that the material had the ordered mesoporous pore structure when n(La)/n(SDS)/n(CO(NH₂)₂)/n(H₂NCH₂CH₂NH₂)/n(H₂O)=1.0∶1.0∶0.6∶1.0∶200, stirring at 80 ℃ and 4 h using several measurements such as XRD, IR，TG/DTA,N₂ adsorption-desorption .The results indicate that the material had the medial pore structure with average pore diameter of 2.6 nm and the specific surface area of 182 m²/g. The LaOS materials were used as catalysts in the ethoxylation reaction. The results show that the material was highly catalytic activity. Experiment indicates that the optimum processing parameters are :120 ℃, 0.5 MPa,mass fraction of 10% catalyst (LaOS) and average reaction rate of epoxy ethane is 3.7 mol/(mol·h). And narrowed chain distributions of octanol polyoxyethlene were formed in the presence of LaOS catalyst.

Key words: Lanthanum oxide/dodecyl sulfate   ,   ,  Mesoporous material  ,   ,  Characterize  ,  , Catalysis   ,  Ethoxylation

摘要： 以十二烷基硫酸钠(SDS)为模板剂,尿素和乙二胺为介质,当n(La)/n(SDS)/n(CO(NH ₂)₂ )/n
(H₂NCH₂CH₂NH ₂)/n(H₂O)=1.0∶1.0∶0.6∶1.0∶200,反应温度为80℃、反应时间为4h时,用水热法合成了氧
化镧/十二烷基硫酸钠复合中孔材料(LaOS)。通过XRD,IR,TG/DTA和N2 吸附脱附等方法对样品的晶体结构和
表面物性进行了研究。结果表明,合成的氧化镧/十二烷基硫酸钠复合物具有典型的六方中孔结构特征,比表面积
为182m ²/g,平均孔径为2.6nm。将氧化镧/十二烷基硫酸钠复合物用于催化正辛醇乙氧基化反应,当LaOS的质
量分数为10%,反应温度为120℃,初始反应压力0.5MPa时,环氧乙烷的平均反应速率为3.7mol/(mol·h)。产
物正辛醇聚氧乙烯醚相对分子质量分布较窄。

关键词: 氧化镧/十二烷基硫酸钠  ,  , 中孔材料   ,   ,  表征  ,   , 催化  ,  ,  乙氧基化