title: Silica coated noble metal nanoparticle hydrosols as supported catalyst precursors.
abstract: Synthesis of well-defined nanoparticles has been intensively pursued not only for their fundamental scientific interest, but also for many technological applications. One important development of the nanomaterial is in the area of chemical catalysis. We have now developed a new aqueous-based method for the synthesis of silica encapsulated noble metal nanoparticles in controlled dimensions. Thus, colloid stable silica encapsulated approximately 5 nm platinum nanoparticle is synthesized by a multi-step method. The thickness of the silica coating could be controlled using a different amount of silica precursor. These particles supported on a high surface area alumina are also demonstrated to display a superior hydrogenation activity and stability against metal sintering after thermal activation.
authors.affiliation: The Surface and Catalysis Research Centre, School of Chemistry, University of Reading, United Kingdom.
authors.forename: Tung Shing Adam
authors.initials: TS
authors.lastname: Kong
authors.forename: Kai Man Kerry
authors.initials: KM
authors.lastname: Yu
authors.forename: Shik Chi
authors.initials: SC
authors.lastname: Tsang
mesh_terms: D002384:Catalysis; D006046:Gold / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D008422:Materials Testing; D008670:Metals / Q000737:chemistry; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D020100:Hydrogels; D008670:Metals; D010984:Platinum; D006046:Gold; D012822:Silicon Dioxide