Department of Chemistry, Lebanon Valley College, 101 North College Avenue, Annville, Pennsylvania 17003, USA.
Langmuir. 2010 Nov 2;26(21):16481-5. doi: 10.1021/la101383s.
An immobilized platinum nanocatalyst was prepared by first functionalizing the surface of activated silica with poly(vinylpyrrolidone) (PVP) and then reducing encapsulated platinum ions in the presence of these functionalized supports to form nanoparticles. Surface functionalization was monitored by infrared spectroscopy and surface area measurements, and the resulting nanocatalyst was characterized using transmission electron microscopy (TEM) and X-ray diffraction (XRD). Platinum nanoparticle size was determined to be approximately 5 nm based on TEM and XRD measurements. Catalytic activity of this material for the hydrogenation of cyclohexanone was found to be greater than that of unsupported colloidal PVP-capped platinum nanocatalysts. In addition, the immobilized nanocatalyst displayed no change in activity after being recycled. Taken together, these results clearly indicate advantages in the design of catalytic materials with desired properties.
一种固定化的铂纳米催化剂是通过首先用聚乙烯吡咯烷酮（PVP）对活化二氧化硅的表面进行功能化，然后在这些功能化载体的存在下还原包裹的铂离子来形成纳米颗粒而制备的。表面功能化通过红外光谱和表面积测量进行监测，所得纳米催化剂使用透射电子显微镜（TEM）和 X 射线衍射（XRD）进行表征。根据 TEM 和 XRD 测量，铂纳米颗粒的尺寸确定为约 5nm。该材料对环己酮加氢的催化活性大于无载体胶体 PVP 封端的铂纳米催化剂。此外，固定化纳米催化剂在回收后活性没有变化。总之，这些结果清楚地表明了设计具有所需性能的催化材料的优势。
