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Behavior of adsorbed diphenyl-sulfide on the Pd/C catalyst for o-chloronitrobenzene hydrogenation

Chang Su  Xiao-Nian Li  Qun-Feng Zhang  Lei Ma  Chun-Shan Lu  Feng Feng  
【摘要】:正A series of diphenyl-sulfide(Ph_2S)-immobilized Pd/C catalysts(Pd-Ph_2S_((X))/C) were prepared using the wetness-impregnation and immobilization method.Pd-Ph_2S_((x))w/C catalysts employed for the hydrogenation of o-chloronitrobenzene showed very high selectivity.The structure of Pd-Ph_2S_((x))/C with different molar ratio of ligand(x-values) was characterized by XPS and TG-DSC-MS.The results suggest a "saturated" surface ratio of Ph_2S/Pd(about 0.3) was formed on the Pd-Ph_2S_((x))/C catalysts surface.The Ph_2S immobilized on the Pd particle is quite stable,and the desorption of Ph_2S or dissociative loss of phenyl group was only found at temperatures above 500 K.The possible catalytic mechanism of the Pd-Ph_2S_((x))/C catalyst was also discussed.

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