writer：Xinlin Yang, Hanfan Liu*
keywords：Hydrogenation; Platinum cluster; Metal ion modifier; o-Chloronitrobenzene
source：期刊
specific source：Appl.Catal. A-General, 164, 197-203 (1997).
Issue time：1997年

Hydrogenation of o-chloronitrobenzene has been studied in methanol at 303 K and atmospheric pressure over polyvinylpyrrolidone-stabilizedp latinum colloidal clusters. The catalytic properties of platinum clusters for the hydrogenation of o-chloronitrobenzene to o-chloroaniline were remarkably affected by the metallic cations added. Among these cations, the most favorable influence on activity and selectivity was obtained when Ni 2+ ions were used as modifier. The selectivity for ochloroaniline was increased from 44.7% without a modifier to 66.3% when Ni 2+ ions were introduced into the catalyst system,
while the activity of the catalyst was nearly doubled by the addition of Ni 2+ ion (the average rate of hydrogenation increased from 0.34 mol H2/mol Pt s on neat platinum cluster to 0.64 mol Ha/mol Pt s on the Pt-Ni2+ system). The highest activity(0.72 mol H2/mol Pt s) and selectivity (82.9%) to o-chloroaniline was obtained when the molar ratio of Ni2+/Pt was 8.