Redox properties and CO2 capture ability of CeO2 prepared by a glycol solvothermal method

doi:10.1016/S1872-2067(14)60163-7

Abstract

Abstract:

CeO₂ nanocrystals with plentiful oxygen vacancies were synthesized by a glycol solvothermal method (CeO₂-GST) using the strong reducibility of glycol. For comparison, CeO₂ nanorods (CeO₂-nanorods) and CeO₂nanoparticles (CeO₂-CA) were also prepared. The samples were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, H₂ reduction-O₂ oxidation cycle experiments and in situ CO₂ infrared spectroscopy. The CeO₂-GST sample exposed mainly (111) facets with abundant Ce³⁺ ions on its surface, and it gave excellent reversible redox behavior and high oxygen storage capacity. After seven H₂ reduction-O₂ oxidation cycles, the oxygen storage capacity became stable. The CeO₂-GST sample also had a high CO₂ adsorption capacity of 149 μmol/g at 50 ℃ by forming bidentate and bridge carbonates on the CeO₂ surface. These carbonate species were less stable than the unidentate carbonate, bicarbonate and formate species, thus adsorbed CO₂ was released easily. On reduced CeO₂ nanorod, CO₂ formed the stable unidentate carbonate and formate species, which is unfavorable for the release of adsorbed CO₂.

Key words: Ceria, Oxygen vacancy, Reversible redox property, Carbon dioxide capture, Carbon dioxide in-situ diffuse reflectance infrared spectroscopy

Chuncheng Li, Xiaohui Liu, Guanzhong Lu, Yanqin Wang. Redox properties and CO₂ capture ability of CeO₂ prepared by a glycol solvothermal method[J]. Chinese Journal of Catalysis, 2014, 35(8): 1364-1375.

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Redox properties and CO₂ capture ability of CeO₂ prepared by a glycol solvothermal method

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