title: Controlled synthesis of ceria nanoparticles for the design of nanohybrids.
abstract: Ceria nanoparticles were synthesized from reaction mixture of cerium nitrate/hexamethylenediamine/water-ethylene glycol. Lamellar, particle-aggregated array, platelet, rice, cube, quasi-sphere shapes of the ceria nanoparticles can be controlled by tuning reaction parameters (reagent concentration, reagent components, pH, and reaction conditions). Studies on shape-dependent catalysis of the bare ceria samples toward CO oxidation indicated that the cube-shaped ceria nanoparticles show better catalytic activity than the nanospheres and the commercial micropowders. As capped by hexamethylenediamine (HEA) molecules, amine-functionalized ceria nanoparticles act as platforms for depositing copper particles to produce efficient Cu/CeO(2) hybrid nanocatalysts for CO conversion. Coupling of the copper clusters with the HEA-capped ceria nanocubes was achieved with the Cu contents up to 15 wt.%. The Cu/CeO(2) nanohybrids show an enhanced catalytic efficiency of low temperature CO conversion. This could be due to high exposure of the reactive {100} facets in the ceria nanocubes and interfacial copper-ceria interactions.
authors: Department of Chemical Engineering, Laval University, Quebec, G1V 0A6, Canada.
authors: Thanh-Dinh
authors: TD
authors: Nguyen
authors: Cao-Thang
authors: CT
authors: Dinh
authors: Driss
authors: D
authors: Mrabet
authors: Minh-Nguyet
authors: MN
authors: Tran-Thi
authors: Trong-On
authors: TO
authors: Do