催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (8): 1299-1305.DOI: 10.1016/S1872-2067(11)60398-7

• 研究论文 • 上一篇    下一篇

Liquid Phase Hydrogenation of Nitrobenzene over Nickel Supported on Titania

K. Joseph Antony RAJ1, M. G. PRAKASH1,2, R. MAHALAKSHMY2, T. ELANGOVAN1, B. VISWANATHAN1,*   

  1. 1National Centre for Catalysis Research, Indian Institute of Technology-Madras, Chennai 600036, India; 2PG & Research Department of Chemistry, Thiagarajar College, Madurai 625009, India
  • 收稿日期:2012-03-02 修回日期:2012-04-25 出版日期:2012-08-01 发布日期:2012-08-01

Liquid Phase Hydrogenation of Nitrobenzene over Nickel Supported on Titania

K. Joseph Antony RAJ1, M. G. PRAKASH1,2, R. MAHALAKSHMY2, T. ELANGOVAN1, B. VISWANATHAN1,*   

  1. 1National Centre for Catalysis Research, Indian Institute of Technology-Madras, Chennai 600036, India; 2PG & Research Department of Chemistry, Thiagarajar College, Madurai 625009, India
  • Received:2012-03-02 Revised:2012-04-25 Online:2012-08-01 Published:2012-08-01

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摘要： The catalytic hydrogenation of nitrobenzene to aniline employing nickel impregnated on rutile, anatase, and high surface area titania supports has been investigated. The nickel is present in elemental state as fcc phase on the catalyst as evidenced by X-ray diffraction results. The Ni crystallite size was found to be greater for Ni/anatase. The temperature-programmed reduction results suggest a greater metal-support interaction for Ni/rutile. The observed order of catalytic activity for the hydrogenation of nitrobenzene is Ni/rutile > Ni/anatase > Ni/TiO2. A conversion of 99% was observed for Ni/rutile at 140 oC and hydrogen pressure of 1.96 MPa. Interestingly, aniline is the only product formed which demonstrates the catalytic hydrogenation of nitrobenzene proceeds with atom economy. Both Ni/rutile and Ni/anatase exhibited a better stability than Ni/TiO2. The hydrogenation proceeds with the preferential adsorption of hydrogen on nickel present in the catalyst surface, possibly assisted by TiOx species.

关键词: hydrogenation, nitrobenzene, nickel, titania, aniline

Abstract: The catalytic hydrogenation of nitrobenzene to aniline employing nickel impregnated on rutile, anatase, and high surface area titania supports has been investigated. The nickel is present in elemental state as fcc phase on the catalyst as evidenced by X-ray diffraction results. The Ni crystallite size was found to be greater for Ni/anatase. The temperature-programmed reduction results suggest a greater metal-support interaction for Ni/rutile. The observed order of catalytic activity for the hydrogenation of nitrobenzene is Ni/rutile > Ni/anatase > Ni/TiO2. A conversion of 99% was observed for Ni/rutile at 140 oC and hydrogen pressure of 1.96 MPa. Interestingly, aniline is the only product formed which demonstrates the catalytic hydrogenation of nitrobenzene proceeds with atom economy. Both Ni/rutile and Ni/anatase exhibited a better stability than Ni/TiO2. The hydrogenation proceeds with the preferential adsorption of hydrogen on nickel present in the catalyst surface, possibly assisted by TiOx species.

Key words: hydrogenation, nitrobenzene, nickel, titania, aniline