Qunfeng Zhang, Chang Su, Jie Cen
Oct 1, 2014
Citations
0
Influential Citations
11
Citations
Journal
Chinese Journal of Chemical Engineering
Abstract
Abstract In this study, diphenyl sulfide (Ph 2 S) was employed to prepare a series of Ph 2 S-modified Pd/C catalysts (Pd–Ph 2 S/C). Catalyst characterization carried out by Brunner–Emmet–Teller (BET), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and CO chemisorption uptake measurements suggested a chemical interaction between Ph 2 S and Pd. The ligand was preferably absorbed on the active site of Pd metal but after increasing the amount of Ph 2 S, the adsorption of Ph 2 S on Pd metal tended to be saturated and the excess of Ph 2 S partially adsorbed on the activated carbon. A part of Pd atoms without adsorbing any Ph 2 S still existed, even for the saturated Pd–Ph 2 S/C catalyst. The Pd–Ph 2 S/C catalysts exhibited a good selectivity of p -chloroaniline ( p -CAN) in the hydrogenation of p -chloronitrobenzene ( p -CNB). However, the chemisorption between Ph 2 S and Pd was not so strong that part of Ph 2 S was leached from Pd–Ph 2 S/C catalyst during the hydrogenation, which caused the decline of the selectivity of p -CAN over the used Pd–Ph 2 S/C catalyst. Resulfidation of the used Pd–Ph 2 S/C catalyst was effective to resume its stability, and the regenerated Pd–Ph 2 S/C catalyst could be reused for at least ten runs with a stable catalytic performance.