Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (12): 1883-1888.DOI: 10.1016/S1872-2067(11)60451-8

• Research papers • Previous Articles     Next Articles

Flower-Like Co-Ni/C Bimetallic Catalysts for the Selective Hydrogenation of o-Chloronitrobenzene

XIE Yaling, XIAO Nan, LING Zheng, LIU Yue, YU Chang, QIU Jieshan*   

  1. Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2012-07-20 Revised:2012-08-16 Online:2013-01-18 Published:2012-12-18

Abstract: Three dimensional flower-like Co-Ni/C bimetallic catalysts composed of interlaced carbon flakes with highly dispersed metal nanoparticles were synthesized by a facile hydrothermal/solvothermal process followed by a heat treatment in flowing N2. The sizes of the metal nanoparticles were from 26 to 4 nm, which became smaller as the Co/Ni molar ratio increased. The catalytic activities for the selective hydrogenation of o-chloronitrobenzene to o-chloroaniline were tested. The conversion of o-chloronitrobenzene over the bimetallic Co-Ni/C catalysts was increased by up to 200% compared with that over a mono-metallic Co/C catalyst, which was due to a synergistic interaction between the Co and Ni species. Hydrogen temperature-programmed desorption results showed that new active sites were formed in the Co50Ni50/C catalyst due to the formation of a Co-Ni alloy, which gave the improved activity of the Co50Ni50/C catalyst.

Key words: cobalt, nickel, carbon nanomaterials, bimetallic catalyst, synergistic effect, o-chloronitrobenzene, hydrogenation