Zhang Feifei, Yang Ping, Matras-Postolek Katarzyna
J Nanosci Nanotechnol. 2016 Jun;16(6):5966-74. doi: 10.1166/jnn.2016.10858.
A three-step synthesis has been developed to fabricate Au nanoparticle-decorated silica spheres as a catalyst (Au/SiO2). The Au/SiO2 catalyst was created by depositing uniformly Au nanoparticles with an average diameter of 5 nm on the SiO2 spheres by using optimal preparation conditions. Furthermore, the ratio of SiO2 and gold plays an important role for creating highly monodispersed Au nanoparticles. Compared with pure gold nanoparticles, the catalyst revealed admirable catalytic performance for the reduction reaction of 4-nitrophenol. The catalytic activities of Au/SiO2 samples were evaluated by the catalytic reduction of 4-nitrophenol under the liquid phase hydrogenation. Au/SiO2 catalysts with enough stability and activity can be recycled five times continuously for the reduction of 4-nitrophenol. The reduction mechanism of 4-nitrophenol and the catalytic action of the Au/SiO2 catalyst which has high reaction race constant k were discussed.
已经开发出一种三步合成法来制备作为催化剂的金纳米颗粒修饰的二氧化硅球（Au/SiO₂）。通过使用最佳制备条件，在二氧化硅球上均匀沉积平均直径为5nm的金纳米颗粒，从而制备出Au/SiO₂催化剂。此外，二氧化硅与金的比例对于制备高度单分散的金纳米颗粒起着重要作用。与纯金纳米颗粒相比，该催化剂对4-硝基苯酚的还原反应表现出令人钦佩的催化性能。通过在液相加氢条件下催化还原4-硝基苯酚来评估Au/SiO₂样品的催化活性。具有足够稳定性和活性的Au/SiO₂催化剂可以连续循环使用五次来还原4-硝基苯酚。讨论了4-硝基苯酚的还原机理以及具有高反应速率常数k的Au/SiO₂催化剂的催化作用。
