Influence of {111} nanofaceting on the dynamics of CO adsorption and oxidation over Au supported on CeO2 nanocubes: An operando DRIFT insight

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

“…Figure 2a, b, d, e). It agrees well with a recent work of Fernández-García et al [15], where the preferable Au deposition on the CeO 2 (NF) support was observed. The authors explain it by higher anchoring capacity for gold during the deposition precipitation process on the reconstructed surface.…”

“…On the other hand, Tinoco et al showed that gold supported on the CeO 2 (NF) presents an intrinsic (per gold surface atom) CO oxidation activity much higher than gold on the non-reconstructed oxide [13]. Fernández-García et al, ) at {111} nanofacets [15]. Despite this contradiction, which we cannot explain at this moment, an important role of the texture of the edges of ceria nanocubes is clearly visible.…”

“…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].…”

“…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]. Figure 1 shows the representative TEM images of as-prepared Au/CeO 2 (NC) ( Fig.…”

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

“…In fact, most catalysts show an increase in CO adsorbed (2100 cm −1 ), which is associated with CO-Au 0 species [64], indicating that Au could be present mostly as Au 0 on the catalytic surface, as previously reported for systems such as Au/CeO 2 [20] and Au/La 2 O 3 /Al 2 O 3 [33], evaluated by XPS. However, in AuCu/CeO 2 -SiO 2 and AuCu/CeO 2 -ZrO 2 , a weak peak of CO adsorption between 2075 and 2050 cm −1 is also observed, which has been associated with the formation of CO-Au δ− species [65]. In the case of AuCu/CeO 2 -ZrO 2 , the formation of these species only occurs after several CO pulses.…”