文摘
Multishelled, Pt-loaded Ce<sub>0.75sub>Zr<sub>0.25sub>O<sub>2sub> yolk–shell microspheres were prepared by a simple spray pyrolysis process for use in the water–gas shift (WGS) reaction. The Pt-loading was optimized, obtaining highly active Pt/Ce<sub>0.75sub>Zr<sub>0.25sub>O<sub>2sub> yolk–shell nanostructures for the WGS. Of the prepared catalysts, a 2% Pt loading of the Ce<sub>0.75sub>Zr<sub>0.25sub>O<sub>2sub> yolk–shell microspheres showed the highest CO conversion. The high catalytic activity of the 2% Pt/Ce<sub>0.75sub>Zr<sub>0.2sub>O<sub>2sub> catalyst was mainly due to its easier reducibility and the maintenance of active catalytic Pt species. The Pt-loaded Ce<sub>0.75sub>Zr<sub>0.25sub>O<sub>2sub> catalyst microspheres were highly resistant to Pt sintering because of their unique yolk–shell structure. Spray pyrolysis was found to be highly efficient for the production of precious-metal-loaded, multicomponent metal oxide yolk–shell microspheres for catalytic applications.