Citation:
Wei Min MO, Bo Shun WAN, Shi Jian LIAO. An efficient Approach to Modify the Catalyst Activity for the Hydrogenation of Nitrobenzene[J]. Chinese Chemical Letters,
;2001, 12(9): 817-820.
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The addition of a suitable amount of PPh3 to PdCI2 or PdCl2(PhCN)2 in situ canconsiderably increase the catalytic activity in the hydrogenation of nitrobenzene, while the catalytic activities of PdCI2 (reduced)+PPh3, PdCI2(PPh3)2 and Pd(PPh3)4 are very poor. The poisoning of catalyst by mercury indicates that the catalytically active species are composed of Pd(0) colloidal particles. Transmission electron micrographs show that the size of nanometric Pd(0)particles of PdCI2 with PPh3 added in situ is smaller than that of PhCl2(PPh3) or PdC12(reduced)+PPh3. A synergic effect of bimetallic catalysts such as PdCI2+nPPh3+NiCl2 (n=0.5, 1)and PdCl2(PhCN)2+PPh3+FeCI3 gives rise to a further increase in the catalytic activity.
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