Portal de Periódicos da CAPES

Preparation and Characterization of Polymer-Stabilized Ruthenium–Platinum and Ruthenium–Palladium Bimetallic Colloids and Their Catalytic Properties for Hydrogenation of o-Chloronitrobenzene

1999; Elsevier BV; Volume: 214; Issue: 2 Linguagem: Inglês

10.1006/jcis.1999.6186

1095-7103

Manhong Liu, Weiyong Yu, Hanfan Liu, Jingming Zheng,

Ammonia Synthesis and Nitrogen Reduction

Colloidal dispersions of poly(N-vinyl-2-pyrrolidone) (PVP)-stabilized ruthenium–platinum and ruthenium–palladium bimetallic colloids were prepared by NaBH4 reduction of the corresponding mixed-metal salts at room temperature and characterized by TEM, XPS, and XRD. The resulting bimetallic colloids were used as catalysts for the selective hydrogenation of o-chloronitrobenzene (o-CNB) in methanol at 303 K under 0.1 MPa of hydrogen. It was observed that the catalytic performance of PVP-stabilized ruthenium–platinum colloids (PVP–Ru/Pt) and ruthenium–palladium colloids (PVP–Ru/Pd) was dependent on their compositions and could be remarkably affected by some added metal cations. In the presence of cobalt ion, nearly 100% selectivity to o-chloroaniline (o-CAN) was achieved over PVP–Ru/Pt colloids at 100% conversion of o-CNB, with an activity two orders of magnitude higher than that of monometallic PVP–Ru colloid.