催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (7): 612-616.

• 研究论文 • 上一篇    下一篇

原位液相催化加氢法合成N-乙基苯胺和N,N-二乙基苯胺

沈颖旎,罗智伟,严新焕   

  1. 浙江工业大学绿色化学合成技术国家重点实验室培育基地, 浙江杭州 310032
  • 收稿日期:2008-07-25 出版日期:2008-07-25 发布日期:2012-06-07

In Situ Liquid-Phase Catalytic Hydrogenation for the Synthesis of N-Ethylaniline and N,N-Diethylaniline

SHEN Yingni, LUO Zhiwei, YAN Xinhuan*   

  1. State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China
  • Received:2008-07-25 Online:2008-07-25 Published:2012-06-07

PDF

1120

被引次数

16

摘要： 以硝基苯为原料, Pt/γ-Al2O3为催化剂,乙醇水溶液为溶剂和氢供体,采用原位液相加氢一步法合成了N-乙基苯胺和N,N-二乙基苯胺. 采用低温N2吸附-脱附、电感耦合等离子体发射光谱、X射线衍射、程序升温化学吸附和透射电子显微镜等对Pt/γ-Al2O3催化剂进行了表征,并考察了所制备催化剂的原位液相加氢性能. 结果表明,在温度为503 K、压力为5.0 MPa、空速为3.2 h-1、溶剂水含量为30%以及硝基苯浓度为8%的反应条件下,在Pt/γ-Al2O3催化剂上原位液相加氢合成N-乙基苯胺及N,N-二乙基苯胺有较好的结果,硝基苯转化率达到100%, N-乙基苯胺和N,N-二乙基苯胺的总收率达到99.5%. 讨论了硝基苯原位液相加氢合成N-乙基苯胺和N,N-二乙基苯胺的反应机理.

关键词: 铂, 氧化铝, 硝基苯, 原位液相催化加氢, N-乙基苯胺, N, N-二乙基苯胺, 乙醇

Abstract: In situ liquid-phase hydrogenation of nitrobenzene for the synthesis of N-ethylaniline and N,N-diethylaniline in ethanol-water solution over the Pt/γ-Al2O3catalyst was studied. The Pt/γ-Al2O3catalyst was characterized by N2 adsorption-desorption, inductively coupled plasma atomic emission spectrometry,X-raydiffraction, temperature-programmed desorption, and transmission electron microscopy. The results of the reaction showed that under the conditions of 503 K, 5.0 MPa, 3.2 h-1, and 8% nitrobenzene concentration with 70% ethanol and 30% H2O solution, the nitrobenzene conversion reached 100%, and the total yield of N-ethylaniline and N,N-diethylaniline reached as high as 99.5%. The reaction mechanism was discussed.

Key words: platinum, alumina, nitrobenzene, in situ liquid-phase hydrogenation, N-ethylaniline, N, N-diethylaniline, ethanol