Simultaneous Chemical Modification and Structural Transformation of Stöber Silica Spheres for Integration of Nanocatalysts
journal contributionposted on 10.01.2012, 00:00 by Ke Xin Yao, Hua Chun Zeng
A synthetic approach has been devised to convert conventional Stöber silica (SiO2) spheres into a new type of porous structural platform for supporting multicomponent catalysts. With this approach, we have first prepared zinc-doped SiO2 (Zn-SiO2) hollow spheres, on which zinc oxide (ZnO) phase and ruthenium (Ru) nanoparticles have been deposited and assembled sequentially in solution phase. A series of complex Ru/ZnO/Zn-SiO2 nanocatalysts has been thus been integrated onto the zinc-doped SiO2 supports after additional thermal treatment and reduction. To test their workability under harsh reactive environments, we have further evaluated the above prepared catalysts using arene hydrogenation as model reactions. These integrated nanocatalysts have shown superior activity, high robustness, and easy recovery in the studied heterogeneous catalysis.