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韩文忠， 张瑾， 刘漫红*
(青岛科技大学 材料科学与工程学院， 山东 青岛 266042)
摘要：以聚乙烯吡咯烷酮(PVP)为保护剂，以低沸点醇为还原剂，制备了PVP-Pt胶体。以PVP-Pt胶体为催化剂，进行了邻氯硝基苯(o-CNB)的氢化反应，考察了胶体的粒径、Ru3+离子等因素的影响。结果表明，PVP-Pt胶体粒子的粒径越小，催化剂的活性越高，粒径大小对邻氯苯胺（o-CAN）的选择性基本没有影响。随着Ru3+加入量的增加，对邻氯苯胺的选择性逐渐增加，由82%提高到92%以上，而PVP-Pt催化剂的活性逐渐降低。
关键词：Pt胶体； 聚乙烯吡咯烷酮； 邻氯硝基苯； 催化氢化
中图分类号： O 643.38 文献标志码： A
Catalytic Hydrogenation of o-Chloronitrobenzene over Platinum Colloids
HAN Wen-zhong, ZHANG Jin, LIU Man-hong
(CollegeofMaterials Scienceand Engineering,QingdaoUniversityof Science and Technology,Qingdao266042,China)
Abstract:Poly(N-vinyl-2-pyrrolidone)-stabilized platinum (PVP-Pt) colloids were prepared using poly(N-vinyl-2-pyrrolidone) as protective agent and alkanols of low boiling point as reductant. The PVP-Pt colloids were used as catalyst in the hydrogenation of o-chloronitrobenzene (o-CNB) to o-chloroaniline(o-CAN). The effects of PVP-Pt colloid particle size and Ru3+ ion on reaction results were examined. The results showed that the selectivity to o-CAN changed little and the catalyst activity increased with decreasing of colloid particle size. With increasing of Ru3+ dosage, the selectivity to o-CAN increased gradually while the catalyst activity decreased. The selectivity of o-CAN increased from 82% to 92% after Ru3+ ion was added in the reaction system.
Key words:platinum colloid; poly(N-vinyl-2-pyrrolidone);o-chloronitrobenzene； catalytic hydrogenation
收稿日期： 2010-12-01
基金项目：山东省优秀中青年奖励基金项目（2008BS09009）.
作者简介：韩文忠(1980—)，男，硕士研究生.*通信联系人.
