Recent Advances of Ceria‐Based Materials in the Oxidation of Carbon Monoxide

Abstract

Carbon monoxide (CO) is a toxic and harmful gas pollutant. The realization of low‐temperature CO oxidation has been the focus of research. Also, CO oxidation as a typical model reaction is conducive to the in‐depth study of the catalytic reaction mechanism. Due to its unique oxygen storage/release capacity (OSC) and the easy transition between Ce3+ and Ce4+, CeO2 is widely used as a catalyst and catalyst support in many important reactions, especially the low‐temperature CO oxidation reaction. Herein, the application of cerium‐based materials in low‐temperature CO oxidation and CeO2 activity enhancement strategies in recent years are elaborated upon, including metal loading, adjustment of exposed facets of CeO2, and metal doping, through metal‐support interaction and the generation of oxygen vacancies on the CeO2 surface to improve the CO oxidation activity of cerium‐based catalysts. At the end of the review, the synthesis of Ce‐based materials and their applications and challenges in the field of CO oxidation are looked at.

Aliovalent Doping of CeO2 Improves the Stability of Atomically Dispersed Pt

“…It was previously reported that the doping of rareearth metals into CeO 2 causes changes in the specific surface area, particle size, and morphology of ceria. 15 To ensure that the two samples had similar Pt surface loadings after deposition (the higher the surface loading, the easier it is for the Pt atoms to aggregate 16 ), different weight loadings were used to adjust for the difference in the surface area between the two samples (Figure 2a,b and Table 1). Neither Figure 2a,b nor the additional examples provided in Figure S1 (Supporting Information) provide any sign of aggregated or clustered Pt atoms on the surface of either support.…”

“…Lattice fringes attest to the crystalline nature of the CeO 2 and Gd–CeO 2 supports in Figure a,b, respectively. It was previously reported that the doping of rare-earth metals into CeO 2 causes changes in the specific surface area, particle size, and morphology of ceria . To ensure that the two samples had similar Pt surface loadings after deposition (the higher the surface loading, the easier it is for the Pt atoms to aggregate), different weight loadings were used to adjust for the difference in the surface area between the two samples (Figure a,b and Table ).…”

Experimental progress on the emergent infinite-layer Ni-based superconductors

“…Oxygen vacancies play important roles in oxides including catalysis [109][110][111][112], gas sensor applications [113], energy storage [114,115], electronic states [116] and in oxide interface systems [117][118][119][120][121] such as LaAlO3/SrTiO3 interfaces [122,123]. In the superconducting Nd0.8Sr0.2NiO2/SrTiO3 superconducting system, oxygen vacancies may be generated during the soft chemical reduction, which could contribute conducting channels and thus affect superconducting transitions.…”

Dual‐Site Single‐Atom Catalysts with High Performance for Three‐Way Catalysis

“…Air pollution represents an enormous threat to our health, raising widespread fears and concerns. [1][2][3] As one of the leading sources, automobile exhaust emission must be rigorously controlled, which requires high-performance catalysts to Inspired by the achievements and considering the diversity of emission pollutants, a dual-site strategy should be a potential route to upgrade the existed TWCs, however, the related synthetic approaches and investigation on structure-performance relationship are still rarely reported.…”

“…Air pollution represents an enormous threat to our health, raising widespread fears and concerns. [ 1–3 ] As one of the leading sources, automobile exhaust emission must be rigorously controlled, which requires high‐performance catalysts to convert toxic CO, hydrocarbon and NO x to nontoxic CO 2 , H 2 O, and N 2 (three‐way catalysts, denoted as TWCs). [ 4–6 ] Despite great achievements made, the current TWCs still suffer from the relatively high ignition temperature and poor hydrothermal stability that cannot match the increasingly powerful engines, as well as the stricter and stricter emission regulations.…”