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