Subnano-particle Ce catalyst prepared by pulsed arc-plasma process
•Ce oxide subnano-particles were deposited onto γ-Al2O3 by an arc-plasma process.•The Ce oxide consisted of coordinatively unsaturated Ce in a lower oxidation state.•The catalyst showed a higher activity than Ce/Al2O3 prepared by wet-impregnation.
Highly dispersed cerium oxide subnano-particles containing coordinatively unsaturated (cus) Ce in a lower oxidation state (3 +) were deposited onto γ-Al2O3 using a pulsed arc-plasma process. The as-prepared and thermally aged Ce/Al2O3 catalysts were found to exhibit much higher activities for CO oxidation than those prepared using a conventional wet impregnation process. Characterization by HAADF-STEM, XAFS, XPS and FT-IR and kinetic analysis suggested that the surface abundance of cus Ce plays a key role in the unusual catalytic activity and deviation from the Mars–van Krevelen mechanism.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
Journal: Catalysis Communications - Volume 54, 5 September 2014, Pages 81–85