全文下载：2012020139
莫欣欣， 肖海连， 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，乙醇为还原剂（醇/水体积比为9∶1）制备了PVP-Pt/Ru双金属胶体，并用TEM进行了表征。以PVP-Pt/Ru双金属胶体为催化剂进行了对氯硝基苯(p-CNB)的催化氢化反应。探讨不同铂钌比以及加入不同金属离子后对其催化反应的影响。结果表明，PVP-Pt/Ru双金属胶体催化活性比PVP-Ru的高，比PVP-Pt胶体稍低，对氯苯胺的(p-CAN)选择性有明显的提高，达到99.8%，催化剂的活性随着胶体中钌含量的增加而降低而选择性增加；Sn2+离子对PVP-4Pt/1Ru的修饰作用较好，催化剂的活性由0.067 s-1（根据氢气消耗计算的反应速率）提高到0.205 s-1，选择性由92.1%提高到99.8 %。
关键词： Pt/Ru双金属胶体； 催化氢化； 金属离子； 对氯硝基苯
中图分类号： O 643.38文献标志码： A
Catalytic Hydrogenation of p-Chloronitrobenzene overPVP-Pt/Ru Bimetallic ColloidsMO Xin-xin, XIAO Hai-lian, LIU Man-hong
(College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstact: Poly(N-vinyl-2-pyrrolidone)-stabilized Pt/Ru colloidal nanoparticles (PVP-Pt/Ru) were prepared by ethanol reduction of H2PtCl6·6H2O and RuCl3·nH2O in ethanol-water solvent and characterized by TEM. The colloidal nanoparticles were used in the hydrogenation of p-chloronitrobenzene. The influences of n (Pt): n (Ru) and different metal ions on hydrogenation results were investigated. The results showed that the catalytic activity of PVP-Pt/Ru was higher than that of PVP-Ru, but lower than that of PVP-Pt. High selectivity (99.8%) to p-chloroaniline (p-CAN) could be obtained over PVP-Pt/Ru bimetallic colloids. The selectivity to p-CAN increased and the activity decreased with the increasing of Ru in Pt/Ru colloidal catalysts. The catalytic activity (calculated from H2 consumption) increased from 0.067 s-1 to 0.205 s-1 and the selectivity increased from 92.1% to 99.8% after Sn2+ was added in PVP-4Pt/1Ru colloidal nanoparticles.
Key word: PVP-Pt/Ru bimetallic colloids; catalytic hydrogenation; metal ion; p-chloronitrobenzene
收稿日期：2011-07-20
基金项目： 山东省优秀中青年奖励基金项目（2008 BS09009）.
作者简介： 莫欣欣（1985—），女，硕士研究生.*通信联系人.
