铂原子簇光化学制备及催化活性研究

Photochemical Preparation of Platinum Atom Cluster and Its Catalyticity

在加热条件下,分别以避光和可见光照射方式制备了两种石墨粉(GP)负载铂金属催化剂(Pt@GP).以扫描电子显微镜(SEM)和能量色散X射线光谱(EDS)表征了Pt@GP形貌和组成,以紫外-可见分光光度法(UV-Vis)表征两种Pt@GP催化剂降解对硝基苯酚(4-NP)的催化性能.结果表明,可见光照射有利于铂原子簇粒径更小且分布更均匀.4-NP在两种催化剂条件的降解反应表观速率常数k分别为0.0903 min^(-1)和0.0597 min^(-1).可见光导致的更小粒径和均匀分布显著地提高了铂金属的催化性能.

Two catalysts of platinum loaded on the activated graphite powder(Pt@GP)were respectively prepared under heating condition with and without visible light irradiation.The morphology and composition of Pt@GP catalysts were characterized by scanning electron microscopy(SEM)and energy dispersive X-ray spectroscopy(EDS).The catalytic abilities of two catalysts in the reduction of 4-nitrophenol(4-NP)were analyzed by ultraviolet-visible spectrophotometry(UV-Vis).The results showed that the visible light irradiation improves ultrasmall particle size and uniform distribution of Pt atom clusters.The apparent rate constants k of the degradation of 4-NP are 0.0903 min^(-1) and0.0597 min^(-1),respectively.The ultrasmall particle size and uniform distribution benefited from visible light irradiation significantly improved the catalytic performance of platinum metal catalysts.