Thermally induced reconstruction of ceria nanocubes into zigzag {111}-nanofacetted structures and its influence on catalytic activity in CO oxidation

The Sintering of Au Nanoparticles on Flat {100}, {111} and Zigzagged {111}-Nanofacetted Structures of Ceria and Its Influence on Catalytic Activity in CO Oxidation and CO PROX

“…It was confirmed experimentally in several publications [4,[13][14][15][16], that the {110} edges of ceria nanocubes transform into a set of nanometerheight, {111}-bounded facets as a result of treatment at 500-600 °C. Even though nanocubes' edges (exposing flat {110} face or {111} nanofacets) make < 10% of the total surface area, they have a decisive effect on the reactivity of CeO 2 and Au/CeO 2 catalysts in CO oxidation [13,14]. Despite a promising perspective of using such textured ceria nanoparticles as active supports for noble metal catalysts, there are no publications devoted to the thermal stability of Au on such structures.…”

“…The final solution was treated at 200 °C or 170 °C for 3 h under autogenous pressure in an autoclave to obtain cube-shape and octahedral nanocrystals, respectively. The as-obtained precipitate powder was washed and dried at 60 °C for 12 h. {111}-nanofacetted nanocubes (CeO 2 (NF)) were prepared by annealing of smooth ceria nanocubes (CeO 2 (NC)) in H 2 atmosphere at 500 °C for 3 h, and additional annealing at 200 °C/2 h in O 2 (5%) + He (95%)) [14].…”

“…MD calculations by Castanet et al showed thermally induced reconstruction of {110} edges of ceria nanocubes into zigzagged {111}-nanfacetted structures [4]. It was confirmed experimentally in several publications [4,[13][14][15][16], that the {110} edges of ceria nanocubes transform into a set of nanometerheight, {111}-bounded facets as a result of treatment at 500-600 °C. Even though nanocubes' edges (exposing flat {110} face or {111} nanofacets) make < 10% of the total surface area, they have a decisive effect on the reactivity of CeO 2 and Au/CeO 2 catalysts in CO oxidation [13,14].…”

“…Three types of ceria support for gold nanoparticles were applied-CeO 2 (NC), nanooctahedra CeO 2 (NO), and nanofacetted nanocubes CeO 2 (NF). Previously, we showed that CeO 2 (NC), synthesized by the MAHT method, are single crystals, terminated by {100} faces, with a small contribution of {110} and {111} faces at the edges and corners, respectively [14,18]. CeO 2 (NO), also synthesized by the MAHT method, are single crystals terminated by {111} faces [1,14,19].…”

“…Previously, we showed that CeO 2 (NC), synthesized by the MAHT method, are single crystals, terminated by {100} faces, with a small contribution of {110} and {111} faces at the edges and corners, respectively [14,18]. CeO 2 (NO), also synthesized by the MAHT method, are single crystals terminated by {111} faces [1,14,19]. CeO 2 (NF) are thermally reconstructed CeO 2 (NC) with {110} faces transformed into zigzag structures of nanometer size {111} facets [14,15].…”