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Citation: XIA Yun-Sheng, ZHU Liang-Fang, LI Gui-Ying, HU Chang-Wei. Direct Oxido-amination of Benzene to Aniline over Nickel-Vanadium Catalysts[J]. Acta Physico-Chimica Sinica, ;2005, 21(12): 1337-1342. doi: 10.3866/PKU.WHXB20051202 shu

Direct Oxido-amination of Benzene to Aniline over Nickel-Vanadium Catalysts

1.
1Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064； 2College of Chemistry and Chemical Engineering, Bohai University, Jinzhou 121003

Received Date: 12 April 2005
Available Online: 15 December 2005

A series of Ni-V/γ-Al2O3 catalysts were prepared and used in the one-step synthesis of aniline from benzene, hydrogen peroxide, and aqueous ammonia and/or urea. It was found that both Ni/γ-Al2O3 and V/γ-Al2O3 catalysts were effective for the activation of C—H bond of benzene, and the co-existed Ni and V on γ-Al2O3 exhibited synergetic effects which promoted the formation of aniline. When the molar ratio of Ni to V was 5.5, the Ni-V/γ-Al2O3 catalyst showed the highest activity and selectivity for aniline. The highest selectivity to aniline obtained was 85%, which was far higher than that to the by-product phenol. The optimal conditions obtained in present work were as the following: reaction time, 2 h; reaction temperature, about 333 K. Urea was found to be one possible aminating agent for this one-step process in basic reaction media. The synergic effect between ammonia and urea under the conditions investigated was found favorable for the production of aniline.
- Aniline;Aqueous ammonia;Hydrogen peroxide;Urea;Benzene
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