Title: Reaction-induced atomic dispersion of supported noble metal nanoparticles via anti-Ostwalt ripening

Speaker: Prof. Yunjie Ding, Dalian Institute of Chemical Physics, Chinese Academy of Sciences

Date: 2019-06-17 10:30

Location: Room 202, Lujiaxi Building

Abstract：

Supported noble metal nanoclusters and single-metal-sites catalysts are inclined to aggregate into particles, driven by the high surface-to-volume ratio. Numerous techniques to disperse metal nanoparticles have been developed. Herein, we report a general method to atomically disperse noble metal nanoparticles via an anti-Ostwald ripening process. The activated carbon supported nanoparticles of Ru, Rh, Pd, Ag, Ir and Pt metals with loading up to 5 wt. % were atomically dispersed by reacting with CH3I and CO mixture. The dispersive process of Rh nanoparticle was in depth investigated as an example. The in-situ detected I· radicals and CO molecule were identified to promote the breakage of Rh-Rh bonds and the formation of mononuclear complexes. The isolated Rh mononuclear complexes were immobilized by the oxygen-containing functional groups based on the effective atomic number rule.