Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2007, Vol. 28 ›› Issue (7): 579-581.

• Articles •     Next Articles

Selective Hydrogenation of p-Chloronitrobenzene over Ru-Ir/γ-Al2O3 Catalyst Modified by Organic Amines

XU Qiong1,2, Wang Lei1, CHEN Junru1, LI Xianjun1, LI Ruixiang1*   

  1. 1 Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China; 2 College of Chemistry, Shaanxi Technology University, Hanzhong 723000, Shaanxi, China
  • Received:2007-07-25 Online:2007-07-25 Published:2011-07-25

PDF (PC)

778

Abstract: A Ru-Ir/γ-Al2O3 bimetallic catalyst was prepared by impregnating γ-Al2O3 with a isopropylalcohol solution of RuCl3 and H2IrCl6. The effect of organic amine modifiers on the selective hydrogenation of p-chloronitrobenzene (p-CNB) over Ru-Ir/γ-Al2O3 was investigated. The addition of ethylenediamine and L-lysine remarkably improved the catalytic activity of Ru-Ir/γ-Al2O3 and the selectivity for p-chloroaniline (p-CAN) at high conversion of p-CNB. In the presence of ethylenediamine, the conversion of p-CNB increased from 37.2% to 95.6% and the selectivity for p-CAN was maintained at 100%. Similarly, the addition of L-lysine greatly enhanced the catalyst activity and completely suppressed the formation of by-products. The promotion effect was attributed to the coordination of ethylenediamine or L-lysine with the metal center, with improved the cooperation between ruthenium and iridium.

Key words: ruthenium, iridium, alumina, ethylenediamine, L-lysine, p-chloronitrobenzene, hydrogenation