Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (01): 121-126.doi: 10.3866/PKU.WHXB20080121

• ARTICLE • Previous Articles     Next Articles

Hydrogenation of o-chloronitrobenzene over CNTs Supported Pt Catalyst Obtained by Laser Vaporization of Bulk Metal

XU Xing-Zhong; YANG Jian-Feng; LI Xiao-Nian; YAN Xin-Huan   

  1. State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China
  • Received:2007-06-18 Revised:2007-09-05 Published:2008-01-05
  • Contact: YAN Xin-Huan

Abstract: Pt nano clusters were produced by the laser vaporization of bulk metal and were deposited on the surface of carbon nanotubes (CNTs) to produce carbon nanotubes supported Pt catalyst (Pt/CNTs). Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) showed that Pt nanoparticles had a narrow size distribution and the Pt content was connected with the preparation condition. X-ray diffraction (XRD) analysis showed that the Pt/CNTs had crystalloid structure which related to the catalytic performance. X-ray photoelectron spectroscopy (XPS) was used to measure core level binding energy shifts of Pt 4f7/2 and Pt 4f5/2. Its catalytic performance was evaluated by liquid-phase hydrogenation of o-chloronitrobenzene (o-CNB). The results showed that the Pt/CNTs catalyst exhibited higher conversion and selectivity. The most favorable preparation condition was obtained as follows: T=25 ℃, V=250 V, and p=300 Pa. It was found that the highest conversion of o-chloronitrobenzene could reach 99.7% while the selectivity to o-chloroaniline could reach 98.2% in alcohol at 60 ℃ under 1.0 MPa of hydrogen, showing good potential application.

Key words: Platinum, Laser vaporization, Carbon nanotube, Hydrogenation, o-chloronitrobenzene