Synthesis and Structural Characterization of Eu2O3 Doped CeO2: Influence of Oxygen Defects on CO Oxidation

Stability and Sensing Enhancement by Nanocubic CeO2 with {100} Polar Facets on Graphene for NO2 at Room Temperature

Metal oxides with a polar surface interact strongly with polar NO₂ molecules, thus facilitating sensitive detection of NO₂. In this work, the composites comprising graphene and cubic CeO₂ nanoparticles with the {100} polar surface are prepared by a hydrothermal technique, and they exhibit fast response, excellent selectivity, stable recovery, and sensitive detection with a low detection limitation of 1 ppm for NO₂ at room temperature. According to the first-principle calculations, the adsorption energy of NO₂ on the CeO₂{100} polar surface is the most negative corresponding to the strongest interactions between them. The formation energy of oxygen vacancies (O_v) on the {100} polar plane is also negative, and the abundant O_v facilitates the adsorption of NO₂. The internal electric field near the polar surface promotes the charge separation and accelerates the charge exchange between NO₂ and the composites. In addition, graphene promotes electron transfer at the interface and improves the stability of the CeO₂{100} polar surface. The composites of graphene and metal oxides with a polar surface are excellent for NO₂ detection, and the discovery reveals a new sensing strategy.

Investigation on the physicochemical properties of Ce0.8Eu0.1M0.1O2−δ (M = Zr, Hf, La, and Sm) solid solutions towards soot combustion

The physicochemical properties of Ce–Eu-oxides were greatly improved by the introduction of trivalent or tetravalent metal cations into their lattice.

Amorphizing of Au Nanoparticles by CeOx -RGO Hybrid Support towards Highly Efficient Electrocatalyst for N2 Reduction under Ambient Conditions

Ammonia synthesis is one of the most kinetically complex and energetically challenging chemical processes in industry and has used the Harber-Bosch catalyst for over a century, which is processed under both harsh pressure (150-350 atm) and hightemperature (623-823 K), wherein the energy and capital intensive Harber-Bosch process has a huge energy cost accounting for about 1%-3% of human's energy consumption. Therefore, there has been a rough and vigorous exploration to find an environmentally benign alternative process. As the amorphous material is in a metastable state and has many "dangling bonds", it is more active than the crystallized one. In this paper, CeO_x -induced amorphization of Au nanoparticles anchored on reduced graphite oxide (a-Au/CeO_x -RGO) has been achieved by a facile coreduction method under ambient atmosphere. As a proof-of-concept experiment, a-Au/CeO_x -RGO hybrid catalyst containing the low noble metal (Au loading is 1.31 wt%) achieves a high Faradaic efficiency (10.10%) and ammonia yield (8.3 μg h^-1 mg^-1_cat. ) at -0.2 V versus RHE, which is significantly higher than that of the crystalline counterpart (c-Au/RGO), and even comparable to the yields and efficiencies under harsh temperatures and/or pressures.

Heterogeneous recyclable nano-CeO2 catalyst: efficient and eco-friendly synthesis of novel fused triazolo and tetrazolo pyrimidine derivatives in aqueous medium

A ceria nanocatalyst was used for the one-pot, multicomponent condensation reaction of benzoylacetonitrile, aromatic aldehydes and 5-amino-triazole/tetrazole proceeding via C–C and C–N bond formation to deliver triazolo/tetrazolo[1,5-a]pyrimidines.

Eu2O3 modified CeO2 nanoparticles as a heterogeneous catalyst for an efficient green multicomponent synthesis of novel phenyldiazenyl-acridinedione-carboxylic acid derivatives in aqueous medium

Synthesis of phenyldiazenyl-acridinedione-carboxylic acids by a one-pot multicomponent coupling of 1,3-dicarbonyl compounds, substituted-phenyl-diazenyl-benzaldehydes and glycine using Eu₂O₃ modified CeO₂ as the catalyst in aqueous medium.