Direct Evidence for the Interfacial Oxidation of CO with Hydroxyls Catalyzed by Pt/Oxide Nanocatalysts

摘要

Understanding the catalytic reaction mechanism at the molecular level is very important for the design of an efficient catalyst but still remains a great challenge. Oxide-supported platinum nano-particles are among the promising commercial catalysts for the water-gas shift (WGS) reaction (CO + H_2O - CO_2 + H2) and the preferential oxidation (PROX) of CO in excess H_2 at low temperatures, which serve as practical strategies for reducing the CO concentration in the hydrogen stream produced from the steam reforming of various hydrocarbons in order to supply clean hydrogen fuel for polymer-electrolyte-membrane fuel cells (PEM-FCs).