催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (5): 454-458.

• 研究论文 • 上一篇    

纳米TiO2催化α-蒎烯空气环氧化反应

阳卫军,李子阳,陶能烨,郭灿城   

  1. 湖南大学化学化工学院, 湖南长沙 410082
  • 收稿日期:2006-05-25 出版日期:2006-05-25 发布日期:2006-05-25

α-Pinene Epoxidation with Air Catalyzed by Nanosized TiO2

YANG Weijun*, LI Ziyang, TAO Nengye, GUO Cancheng   

  1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China
  • Received:2006-05-25 Online:2006-05-25 Published:2006-05-25

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摘要： 采用硫酸钛和氢氧化钠等无机试剂为原料,经过简单步骤制备出纳米TiO2前驱体,用高压釜在270 ℃和7.07 MPa下进行乙醇热处理,得到锐钛矿型纳米TiO2催化剂,并考察了该催化剂对α-蒎烯空气环氧化反应的催化性能. 结果表明,乙醇高压热处理明显地提高了纳米TiO2的催化活性. 在常压、 70 ℃和6 h条件下, α-蒎烯转化率可达17.02%, 环氧化物选择性为53.47%; 当压力增大到1.01 MPa时,转化率提高到35.24%, 选择性下降到41.20%. 对反应机理进行了探讨.

关键词: 纳米二氧化钛, 乙醇, 空气, 蒎烯, 环氧化

Abstract: The anatase TiO2 nanoparticles were prepared by heat treating TiO2 precursor, which was made from Ti(SO4)2 and washed with ethanol, in an autoclave under the conditions of 270 ℃ and 7.07 MPa. The catalyst was used to catalyze α-pinene epoxidation with air. The results showed that the catalyst activity increased markedly after heat treating with ethanol under high pressure. Under the conditions of 101.325 kPa, 70 ℃ and 6 h, the α-pinene conversion reached 17.02% and the selectivity for epoxides was 53.47%. When the system pressure increased to 1.01 MPa, the conversion increased to 35.24% and the epoxide selectivity decreased to 41.20%. The possible reaction mechanism has also been investigated.

Key words: nanosized titanium dioxide, ethanol, air, pinene, epoxidation