高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

负载型金基催化剂Au/Fe(OH)3催化苯乙烯环氧化反应

王亚丽1, 孙建红2, 向丹1, 王路1, 孙建敏1, 肖丰收1   

    1. 吉林大学化学学院, 无机合成与制备化学国家重点实验室, 长春 130012;
    2. 广东药学院医药商学院, 广州 510006
  • 收稿日期:2007-06-29 修回日期:1900-01-01 出版日期:2008-01-10 发布日期:2008-01-10
  • 通讯作者: 孙建敏

Epoxidation of Styrene via Anhydrous t-Butylhydroperoxide Catalyzed by Supported Au/Fe(OH)3

WANG Ya-Li1, SUN Jian-Hong2, XIANG Dan1, WANG Lu1, SUN Jian-Min1*, XIAO Feng-Shou1   

    1. State Key Laboratery of Inorganic Synthesis and Preparation Chemistry, College of Chemistry, Jilin University, Changchun 130012, China;
    2. Medical Business School, Guangdong Pharmaceutical University, Guangzhou 510006, China
  • Received:2007-06-29 Revised:1900-01-01 Online:2008-01-10 Published:2008-01-10
  • Contact: SUN Jian-Min

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摘要： 用共沉淀法制备了Au/Fe(OH)3催化剂, 以叔丁基过氧化氢为氧化剂, 考察焙烧温度和金担载量等对苯乙烯环氧化反应的影响. 结果表明, 催化剂的焙烧温度、金担载量对苯乙烯环氧化反应有较大影响. 在室温下直接合成的质量分数为4.67%的Au/Fe(OH)3催化剂对苯乙烯环氧化反应显示了很好的催化活性, 于80 ℃反应3 h苯乙烯的转化率达到84.1%, 环氧苯乙烷的选择性达到71.5%. 通过X射线粉末衍射(XRD)、X射线光电子能谱(XPS)和Mössbauer分析, 发现催化剂的催化活性与金的价态及铁的化学存在状态有很大关系. 离子态Au3+与载体Fe(OH)3的协同作用对苯乙烯环氧化反应显示出很好的催化活性.

关键词: 离子态金, Fe(OH)3载体, 苯乙烯, 环氧化, 叔丁基过氧化氢

Abstract: This paper reports the epoxidation of styrene by t-butyl hydroperoxide(TBHP) over the Au/Fe(OH)3 catalyst prepared by co-precipitation method. The influences of calcination temperature, chemical states of Au and Fe, gold loadings of the catalyst and reaction time on the activity of styrene epoxidation are studied in detail. The results suggest that the conversion and selectivity of styrene epoxide are significantly influenced by the calcination temperature and Au loadings.Au/Fe(OH)3 with a mass fraction 4.67% shows the best activity to the epoxidation of styrene, the conversion is 84.1% and selectivity is 71.5% under the reaction condition of 80 ℃ for 3 h. The XRD, XPS and Fe Mössbauer spectra indicate that Au and Fe chemical states are responsible for the good activity of Au/Fe(OH)3 catalyst. The synergistic effect of Au3+ and Fe(OH)3 leads to its good activity for the styrene epoxidation.

Key words: Cationic gold, Fe(OH)3 support, Styrene, Epoxidation, t-Butylhydroperoxide

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