中文摘要：

以聚乙烯毗咯烷酮（PVP）为保护剂，在甲醇-水中还原H2PdCl4·nH2O，制备了高分子稳定的钯胶体（PVP-Pd）。研究了在303K，0．1MPa氢压下，用PVP-Pd催化邻氯硝基苯（o-CNB）的氢化反应。结果表明，粒径小（4．7nm），分布均匀的PVP-Pd对o-CNB氢化反应具有良好的催化活性[0．923mol H2·（mol Pd·s）^-1]。

英文摘要：

Poly （N-vinyl-2-pyrrolidone） -stabilized palladium colloids （PVP-Pd） were prepared by reducing H2PdCl4 · nH2O in methanol-water. The selective hydrogenation of o-chloronitrobenzene was carried out at 303 K under 0.1 MPa of hydrogen using PVP-Pd as a catalyst. The results showed that catalytic properties of PVP-Pd were dependent upon particle size and size distribution of PVP-Pd. The activity of PVP-Pd colloid with smaller size（4.7 nm） and narrow size distribution reached 0. 923 mol H2· （mol Pd·s）^-1