纳米钯催化剂的制备及其催化性能

Preparation of Palladium Nanoparticles and Its Catalytic Performance

通过以抗坏血酸作为还原剂，聚乙烯吡咯烷酮（PVP）为稳定剂的氯钯酸（Na2Pd2Cl4）水溶液制备出具有一定形貌的高度分散的钯纳米粒子。采用X射线衍射（XRD）、紫外可见吸收光谱（UV—VIS），透射电子显微镜（TEM）等手段对钯纳米粒子结构进行了表征，结果表明，钯纳米粒子被还原成零价金属粒子，并具有一定的立方结构，通过Suzuki反应进行了催化性能的考察，含量仅为O．05％～0．10％（mm01）的钯纳米粒子具有较高的收率。

The highly-dispersed palladium nanoparticles with a certain morphology were successfully prepared by the aqueous solution of palladi- um chloride acid （Na2Pd2C14） with ascorbic acid as a reducing agent, and polyvinylpyrrolidone （PVP） as a stabilizer, The structure of palladium nanopartieles were characterized by X-ray diffraction （XRD）, UV-visible absorption spectroscopy （UV-VIS） and transmission electron microscopy （TEM）. The results indicated that the palladium nanoparticles were reduced to zero valent metal particles, and have a certain cubic structure, and the palladium nanoparticles were applied to Suzuki reaction to test the catalytic activity. The results showed that higher yields would be obtained with on- ly 0.05%-0.10mmol% of palladium nanoparticles.