The Synthesis of Three-Dimensional CeO2 and Their Catalytic Activities for CO Oxidation

Abstract

This article reports a novel preparation of three-dimensional (3D) CeO 2 originating from crystalline cerium formate by a surfactant-free route using H 2 O, ethanol and ethylene glycol as solvents. The sea urchin shaped 3D CeO 2 gave rise to micro/nanocomposite structures with high BET surface area up to 234 m 2 g -1 . The 3D structure improved the reducibility of surface CeO 2 due to the increased oxygen vacancy. Both 3D CeO 2 and 5 wt% CuO loaded on 3D CeO 2 exhibit high catalytic activities for CO conversion.

Synthesis of highly ordered mesoporous CeO2 and low temperature CO oxidation over Pd/mesoporous CeO2

“…The T 50 and T 100 of the meso-CeO 2 material are 308 and 375°C, respectively, which are similar or somewhat higher compared to those of (Table S1, activity comparison over CeO 2 and Pd/CeO 2 catalysts, and Fig. S4) [20][21][22][23][24][25]. As shown in Fig.…”

Morphology Control, Growth Mechanism, and Enhanced Catalytic Activity of Mesoporous CeO2 Microparticles

“…Furthermore, the color contrast of the nanosheet and nanofiber indicates the mesoporous structure of the CeO 2 microparticles, and this is consistent with BJH analysis. The mesoporous structure favors access of molecules to the active surface of the nanocrystals and also favors mass transport 44. Besides, the selected area electron diffraction (SAED) patterns of a single CeO 2 microparticle (insets in Figure 8, b,d) indicate the typical polycrystalline nature of the sample.…”

“…The oxygen‐storage capacity is associated with the ability of CeO 2 to undergo facile conversion between Ce 4+ and Ce 3+ 69–71. Besides, the mesoporous structure favors for access of molecules to the active surface of the nanocrystals and mass transport during CO oxidation 44. Here, the CO conversion reaction was selected as a model reaction to evaluate the catalytic activity of the as‐prepared pure CeO 2 and Au/CeO 2 samples.…”

Multifunctional properties of ceria nanocubes synthesized by a hydrothermal method

“…Cerium oxide-based materials have been extensively investigated and widely used in various applications, such as oxygen storage, catalysts, gas sensors, UV blockers, electronics and corrosion resistance, and the functional layer is made up of solid oxide fuel cells [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Cerium oxides have been one of the most widely used heterogeneous catalysts for several technologically important reactions [2][3][4][18][19][20]. Their catalytic traits can be attributed to two of their main properties, namely oxygen storage capacity of ceria due to the propensity of Ce to change between Ce 3+ and Ce 4+ and high mobility [21].…”