Cerium–zirconium mixed oxide synthesized by sol-gel method and its effect on the oxygen vacancy and specific surface area

Campos, Pablo Teles Aragão; Oliveira, Claudinei Fabiano de; Lima, João Pedro Vieira; Silva, Daniele Renata de Queiroz; Dias, Sílvia C.L.; Dias, José A.

doi:10.1016/j.jssc.2021.122752

Cited by 4 publications

(1 citation statement)

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“…Rumruangwong et al [24] synthesized ceria-zirconia mixed oxide by sol-gel technique and established that the surface area of the Ce x Zr 1−x O 2 powders was improved by increasing ceria content, and their thermal stability was increased by the incorporation of ZrO 2 . Over the past several years, different surfactants (CTAB, Pluronic P123, and F127) have been applied as templates to synthesize mesoporous nanosized ceria-zirconia materials [27,29]. The removal of surfactants after calcination at high temperatures gave rise to the formation of fluorite-structured Ce x Zr 1−x O 2 materials with well-developed mesoporous structures and a high specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Impact of Ce/Zr Ratio in the Nanostructured Ceria and Zirconia Composites on the Selective CO2 Adsorption

Issa,

Kormunda,

Tumurbaatar

et al. 2023

Nanomaterials

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High surface-area, mesoporous CeO2, ZrO2, and Ce-Zr composite nanoparticles were developed using the hydrothermal template-assisted synthesis method. Samples were characterized using XRD, N2 physisorption, TEM, XPS, and FT-IR spectroscopic methods. The CO2 adsorption ability of the obtained materials was tested under dynamic and equilibrium conditions. A high CO2 adsorption capacity in CO2/N2 flow or CO2/N2/H2O was determined for all studied adsorbents depending on their composition flow. A higher CO2 adsorption was registered for Ce-Zr composite nanomaterials due to the presence of strong O2− base sites and enriched surface oxygen species. The role of the Ce/Zr ratio is the process of the formation of highly active and selective adsorption sites is discussed. The calculated heat of adsorption revealed the processes of chemisorption and physisorption. Experimental data could be appropriately described by the Yoon–Nelson kinetic model. The composites reused in five adsorption/desorption cycles showed a high stability with a slight decrease in CO2 adsorption capacities in dry flow and in the presence of water vapor.

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Section: Introductionmentioning

confidence: 99%