Supported Palladium–Gold Alloy Catalysts for Efficient and Selective Hydrosilylation under Mild Conditions with Isolated Single Palladium Atoms in Alloy Nanoparticles as the Main Active Site
作者:Hiroki Miura、Keisuke Endo、Ryoichi Ogawa、Tetsuya Shishido
DOI:10.1021/acscatal.6b02767
日期:2017.3.3
Supported Pd–Au alloy catalysts were developed for the highly efficient and selective hydrosilylation of α,β-unsaturated ketones and alkynes. The Pd/Au atomic ratio of the Pd–Au alloy and the supporting material affected the catalytic activity, and supported Pd–Au alloy nanoparticles with a low Pd/Au atomic ratio functioned as highly active heterogeneous catalysts under mild reaction conditions. Structural
负载型Pd-Au合金催化剂是为α,β-不饱和酮和炔烃的高效选择性氢化硅烷化而开发的。Pd–Au合金和载体材料的Pd / Au原子比影响催化活性,并且具有低Pd / Au原子比的负载Pd–Au合金纳米粒子在温和的反应条件下起着高活性的多相催化剂的作用。通过X射线衍射,X射线吸收光谱(XAS)和透射电子显微镜对负载的Pd-Au合金催化剂的结构表征表明,在载体上形成了均匀大小约为3 nm的无规Pd-Au合金纳米颗粒。此外,XAS和X射线光电子能谱阐明了从Pd到Au的电荷转移以及低Pd / Au比的无规Pd-Au合金中孤立的单个Pd原子的形成,