A facile synthesis for hierarchical porous CeO₂ nanobundles and their superior catalytic performance for CO oxidation

Abstract

Porous CeO2 nanobundles with hierarchical nanoarchitecture show much better catalytic activities for CO oxidation compared to CeO2 nanorods, nanowires and nanoparticles.

Nanostructured cerium oxide: preparation, characterization, and application in energy and environmental catalysis

“…Rao et al recently developed a facile carbonate-assisted formaldehyde hydrothermal approach to build a hierarchical porous CeO 2 nanobundles without using templates and surfactants. [54] The nanobundles assembled by numerous nanorods performed with much better activity for CO oxidation than other ceria nanostructures such as nanorods, nanowires, and NPs. Similarly, He et al prepared a globin-like mesoporous CeO 2 by using CO-assisted synthetic approach based on hydroxide carbonate precursors, where CO helps the formation of the globin-like mesoporous precursors as the carbon source because of its preferential adsorption on Ce 3+ under the hydrothermal conditions, as shown in Fig.…”

“…Some successful approaches have been reported for creating abundant defects in the ceria nanostructures, such as low-pressure thermally annealed ceria nanostructures, [144] pits confined in an ceria thin sheet, [55] and hierarchical porous structure. [31,32,39,54] In pure nanostructured ceria, although it could be rich in defects and superior in performance, a dramatic loss of defect enabled properties over time is a common setback in the relevant industrial application. Therefore, the stability especially the retainment (or readily recovery) of defects (density and states) is still a great challenge for practical applications such as catalytic converters in automotive industry, which usually work under high-temperature and long-time operation harsh environment.…”

Controlled synthesis and magnetic properties of thin CeO2 nanotubes by a facile template-free hydrothermal method

“…To obtain CeO 2 of different morphologies, 10 mmol Ce(NO 3 ) 3 Á6H 2 O and an appropriate amount of Na 3 PO 4 Á6H 2 O (the molar ratio of PO 4 3-to Ce 3? was kept at 5 %) were dissolved in 30 and 10 mL of deionized water, respectively.…”

“…In recent years, there has been growing interest in the controlled synthesis of higher ordered inorganic crystals with specific dimensions and well-defined shapes because of the unique shape-dependent materials properties, which would result in a wide range of electrical, optical, or magnetic properties and open a new domain of theoretical and technological interest [1][2][3][4]. Therefore, considerable efforts have been focused on the fabrication of nanomaterials with various morphology structures owning to stimulated by the fantastic and remarkable properties.…”

Morphology‐Controllable Preparation of CeO2 Materials for CO2 Adsorption

“…[33] However, these synthetic processes usually were complicated with high synthesis cost due to the expensive templates and additives. [34,35] To the best of our knowledge, the CO 2 SM was rarely reported as a raw material to prepare nano-structure CeO 2 crystals without any other additional templates.…”