writer：Xinlin Yang, Hanfan Liu*, Hao Zhong
keywords：PdrPt bimetallic colloid; Metal ion modifier; Hydrogenation; o-Chloronitrobenzene
source：期刊
specific source：J. Mol. Catal. A: Chem., 147, 55-62 (1999).
Issue time：1999年
Hydrogenation of o-chloronitrobenzene o-CNB. has been studied in methanol at 303 K and atmospheric pressure over polyvinylpyrrolidone-stabilized palladium–platinum PVP-PdrPt. bimetallic colloidal clusters. The catalytic properties for the hydrogenation of o-CNB to o-chloroaniline o-CAN. are found to depend on the metal composition of the bimetallic
clusters. All the bimetallic clusters are more active than both PVP-Pd and PVP-Pt monometallic clusters. The highest activity 1.81 mol H2rmol M s. is obtained when PVP-PdrPt 1r2. is used as catalyst. The best selectivity to o-CAN 77.5%. is achieved in PVP-PdrPt 1r3. catalytic system, which is much higher than those of PVP-Pt and PVP-Pd monometallic colloidal clusters. The addition of the metal cations to the system can considerably affect the catalytic properties of the bimetallic clusters. The modification behavior of metal cations also depends both on the composition of PVP-PdrPt bimetallic clusters and the nature of metal cations. For the PVP-PdrPt 1r3. bimetallic clusters, when introducing Cr 3q and Co2q, the high activity 0.96 and 1.03 mol H rmol M s. and the better selectivity 91.5 and 91.4%. 2compared with those of the neat PVP-PdrPt 1r3. catalysts 1.03 mol H2rmol M s and 77.5%. are obtained, respectively.