Abstract
The thermal stability of Au nanoparticles on ceria support of various morphology (nanocubes, nanooctahedra, and {111}-nanofacetted nanocubes) in oxidizing and reducing atmospheres was investigated by electron microscopy. A beneficial effect of the reconstruction of edges of ceria nanocubes into zigzagged {111}-nanofacetted structures on the inhibition of sintering of Au nanoparticles was shown. The influence of different morphology of Au particles on various ceria supports on the reducibility and catalytic activity in CO oxidation, and CO PROX of Au/ceria catalysts was also investigated and discussed. It was shown, that ceria nanocubes with flat {110} terminated edges are more suitable as a support for Au nanoparticles, used to catalyze CO oxidation, than zigzagged {111}- nanofacetted structures.Graphic
Highlights
As a reducible oxide with facile oxygen vacancy formation and easy conversion between the C e3+ and Ce4+ oxidation states, ceria displays good characteristics both as a catalyst and «active» catalytic support [1]
We investigated the sintering of Au nanoparticles supported by nanocubes and nanooctahedra in the both oxidative and reducible atmosphere
The present study aims at determining the role of the morphology of ceria support and type of atmosphere on the thermal stability of Au nanoparticles—key factor responsible for the efficiency and stability of Au/ceria-based catalysts at elevated temperatures
Summary
As a reducible oxide with facile oxygen vacancy formation and easy conversion between the C e3+ and Ce4+ oxidation states, ceria displays good characteristics both as a catalyst and «active» catalytic support [1]. Ta et al, proposed a mechanism of gold nanoparticles stabilization on ceria nanorods, according to which gold atoms at the metal-support interface are anchored onto the underlying surface oxygen vacancies on cerium oxide. The “encapsulation” strategy may result in a covering of the active sites and restrict reagents access to them, which can reduce the catalytic activity of such materials It appears that the disadvantages of the above method of stabilization can be overcome by using support with a zigzagged nano-facetted surface, where both sintering mechanisms will be inhibited due to geometric constraints, while free access of reagents to active sites will be maintained. Reducibility, catalytic activity, and selectivity of these materials in the CO oxidation and CO PROX were investigated and discussed
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