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Title: Spectroscopic Investigation of Surface-Dependent Acid–Base Property of Ceria Nanoshapes

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In addition to their well-known redox character, the acid-base property is another interesting aspect of ceria-based catalysts. Thus, the effect of surface structure on the acid-base property of ceria was studied in detail by utilizing ceria nanocrystals with different morphologies (cubes, octahedra and rods) that exhibit crystallographically well-defined surface facets. The nature, type, strength and amount of acid and base sites on these ceria nanoshapes were investigated via in situ IR spectroscopy combined with various probe molecules. Pyridine adsorption shows the presence of Lewis acid sites (Ce cations) on the ceria nanoshapes. These Lewis acid sites are relatively weak and similar in strength among the three nanoshapes according to the probing by both pyridine and acetonitrile. Both Br nsted (hydroxyl group) and Lewis (surface lattice oxygen) base sites are present on the ceria nanoshapes as probed by CO2 adsorption. CO2 and chloroform adsorption indicate that the strength and amount of the Lewis base sites are shape dependent: rods > cubes > octahedra. Moreover, the weak and strong surface dependence of the acid and base sites, respectively, are a result of interplay between the surface structure dependent coordination unsaturation status of the Ce cations and O anions and the amount of defect sites on the three ceria nanoshapes. Furthermore, it was found that the nature of the acid-base sites of ceria can be impacted by impurities, such as Na and P residues that result from their use as structure-directing reagent in the hydrothermal synthesis of the ceria nanocrystals. Finally, our observation calls for precaution in interpreting the catalytic behavior of nanoshaped ceria where trace impurities may be present.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1185894
Journal Information:
Journal of Physical Chemistry. C, Vol. 119, Issue 13; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 148 works
Citation information provided by
Web of Science

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Cited By (14)

Adsorption of C 2 gases over CeO 2 -based catalysts: synergism of cationic sites and anionic vacancies journal January 2017
Selective oxidation of glycerol on morphology controlled ceria nanomaterials journal January 2019
Sub-15 nm CeO 2 nanowires as an efficient non-noble metal catalyst in the room-temperature oxidation of aniline journal January 2018
Catalytic Pyrolysis of Aliphatic Carboxylic Acids into Symmetric Ketones over Ceria-Based Catalysts: Kinetics, Isotope Effect and Mechanism journal February 2020
Dehydration of 1,5-Pentanediol over Na-Doped CeO 2 Catalysts journal February 2018
Synthesis, application and kinetic modeling of CeO x –Si–CoMo catalysts for the hydrodesulfurization of dibenzothiophene journal January 2019
Catalytic Enhancement of Aldol Condensation by Oxygen Vacancy on CeO 2 Catalysts journal April 2019
Defect Chemistry of Oxides for Energy Applications journal May 2018
Ti x Ce 1−x O 2 nanocomposites: a monolithic catalyst for the direct conversion of carbon dioxide and methanol to dimethyl carbonate journal January 2019
Ceria–zirconia mixed oxides: Synthetic methods and applications journal January 2018
CO 2 and water activation on ceria nanocluster modified TiO 2 rutile (110) journal January 2018
Synthesis routes of CeO 2 nanoparticles dedicated to organophosphorus degradation: a benchmark journal January 2020
CO2 and Water Activation on Ceria Nanocluster Modified TiO2 Rutile (110) preprint February 2018
CO2 and Water Activation on Ceria Nanocluster Modified TiO2 Rutile (110) preprint February 2018

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