Modification of metal complex on hydrogenation of o-chloronitrobenzene over polymer-stabilized platinum colloidal clusters

✍ Scribed by Xinlin Yang; Zhaoli Deng; Hanfan Liu

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 117 KB
• Volume: 144
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(98)00337-9

✦ Synopsis

The effect of metal complex on hydrogenation of o-chloronitrobenzene CNB over poly-vinylpyrrolidone-stabilized Ž . platinum clusters PVP-Pt has been studied in methanol at 303 K and atmospheric pressure. The addition of metal complexes to the catalytic system can considerably modulate both the activity and the selectivity of the catalyst. A low Ž . Ž . activity 0.41 mol H rmol Pt s and low selectivity 42.6% were obtained when the neat PVP-Pt colloidal clusters were 2 Ž . w Ž . x used as a catalyst. Upon the addition of the complexes Ni AcAc and Na Co AcAc , the better selectivity to 2 3 Ž . Ž o-chloroaniline o-CAN were promoted to 76.2% and 76.5%, and the higher activities 0.72 mol H rmol Pt s and 0.83 mol 2 .

Ž . H rmol Pt s were obtained, respectively. On the other hand, when the complex Ni en Cl was introduced as a modifier, 2 3 2 Ž . the highest selectivity to o-CAN 94.0% was achieved, though the activity was lowered to 0.16 mol H rmol Pt s.