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Effect of Dopants on the Adsorption of Carbon Dioxide on Ceria Surfaces

Journal Article · · ChemSusChem (Online)
 [1];  [2];  [2];  [3]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Here, high-surface-area nanosized CeO2 and M-doped CeO2 (M=Cu, La, Zr, and Mg) prepared by a surfactant-templated method were tested for CO2 adsorption. Cu, La, and Zr are doped into the lattice of CeO2, whereas Mg is dispersed on the CeO2 surface. The doping of Cu and La into CeO2 leads to an increase of the CO2 adsorption capacity, whereas the doping of Zr has little or no effect. The addition of Mg causes a decrease of the CO2 adsorption capacity at a low Mg content and a gradual increase at a higher content. The CO2 adsorption capacity follows the sequence Cu-CeO2>La-CeO2>Zr-CeO2≈CeO2>Mg-CeO2 at low dopant contents, in line with the relative amount of defect sites in the samples. It is the defect sites on the surface, not in the bulk of CeO2, modified by the dopants that play the vital role in CO2 chemisorption. Lastly, the role of surface oxygen vacancies is further supported by an in situ IR spectroscopic study of the surface chemistry during CO2 adsorption on the doped CeO2.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Energy Frontier Research Centers (EFRC) (United States). Center for Understanding and Control of Acid Gas-induced Evolution of Materials for Energy (UNCAGE-ME)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725; SC0012577
OSTI ID:
1286871
Journal Information:
ChemSusChem (Online), Journal Name: ChemSusChem (Online) Journal Issue: 21 Vol. 8; ISSN 1864-564X
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Defect Chemistry of Oxides for Energy Applications journal May 2018
Designing amino-based ionic liquids for improved carbon capture: One amine binds two CO 2 journal October 2018
Impact of Surface Composition of SrTiO 3 Catalysts for Oxidative Coupling of Methane journal April 2019
CO 2 Reduction by Hydrogen Pre‐Reduced Acceptor‐Doped Ceria journal June 2019
Synthesis and characterization of nickel-doped ceria nanoparticles with improved surface reducibility journal January 2018
Atomic structures and local electronic properties of K- and Rh-modified ceria/Pt(111) inverse model catalysts journal November 2019
Adsorption and Desorption Properties of CO 2 on CeO 2 Nanoparticles Prepared via Different Synthetic Routes journal January 2019

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