Ceria rhombic microplates: Synthesis, characterization and catalytic activity

N. K. Renuka; A. K. Praveen; C. U. Aniz

doi:10.1016/j.micromeso.2012.10.010

Ceria rhombic microplates: Synthesis, characterization and catalytic activity

N. K. Renuka^*
, A. K. Praveen
, C. U. Aniz

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

Herein, we report the synthesis, characterization, and catalytic activity of ceria rhombic micro plates obtained from aqueous cerium nitrate in presence of urea and CTAB. The material was characterized using SEM, TEM, XRD (low and wide angle), FTIR spectra, N₂ adsorption, UV-DRS, and XPS analysis. The ceria consisted of plates of edge length ∼1 μm, and thickness ∼100 nm. BET surface area, and pore volume of the microplates were 57 m²/g, and 0.03 cm³/g, respectively. The particle size of the material was calculated from TEM analysis, XRD study, and BET surface area analysis. Cubic cerianite crystallites (CeO₂) were detected by powder XRD, while the presence of Ce³⁺ was also evident from XPS and DR UV spectroscopy study. Tetravalent cerium constituted 56% of the total composition, as revealed by XPS analysis. Both Ce₂O₃ as well as oxygen vacancy contributed towards the presence of Ce³⁺ in the sample. The direct optical band gap of ceria is blue-shifted with respect to the bulk material indicating quantum-size confinement in nano crystallites in the plate structure. Bilayer assembly of CTAB has been proposed during the formation of ceria microplates. The system exhibited extremely high CO oxidation activity than the corresponding bulk oxide.

Original language	English
Pages (from-to)	35-41
Number of pages	7
Journal	Microporous and Mesoporous Materials
Volume	169
DOIs	https://doi.org/10.1016/j.micromeso.2012.10.010
State	Published - 15 Mar 2013
Externally published	Yes

Bibliographical note

Funding Information:
The financial assistance received from Kerala State Council for Science Technology and environment is gratefully acknowledged.

Keywords

CO oxidation
Ceria
Electron microscopy
Microplates
XPS

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials

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10.1016/j.micromeso.2012.10.010

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@article{9a4047056f964f5da6e5d044946c9ca1,

title = "Ceria rhombic microplates: Synthesis, characterization and catalytic activity",

abstract = "Herein, we report the synthesis, characterization, and catalytic activity of ceria rhombic micro plates obtained from aqueous cerium nitrate in presence of urea and CTAB. The material was characterized using SEM, TEM, XRD (low and wide angle), FTIR spectra, N2 adsorption, UV-DRS, and XPS analysis. The ceria consisted of plates of edge length ∼1 μm, and thickness ∼100 nm. BET surface area, and pore volume of the microplates were 57 m2/g, and 0.03 cm3/g, respectively. The particle size of the material was calculated from TEM analysis, XRD study, and BET surface area analysis. Cubic cerianite crystallites (CeO2) were detected by powder XRD, while the presence of Ce3+ was also evident from XPS and DR UV spectroscopy study. Tetravalent cerium constituted 56\% of the total composition, as revealed by XPS analysis. Both Ce2O3 as well as oxygen vacancy contributed towards the presence of Ce3+ in the sample. The direct optical band gap of ceria is blue-shifted with respect to the bulk material indicating quantum-size confinement in nano crystallites in the plate structure. Bilayer assembly of CTAB has been proposed during the formation of ceria microplates. The system exhibited extremely high CO oxidation activity than the corresponding bulk oxide.",

keywords = "CO oxidation, Ceria, Electron microscopy, Microplates, XPS",

author = "Renuka, \{N. K.\} and Praveen, \{A. K.\} and Aniz, \{C. U.\}",

note = "Funding Information: The financial assistance received from Kerala State Council for Science Technology and environment is gratefully acknowledged.",

year = "2013",

month = mar,

day = "15",

doi = "10.1016/j.micromeso.2012.10.010",

language = "English",

volume = "169",

pages = "35--41",

}

TY - JOUR

T1 - Ceria rhombic microplates

T2 - Synthesis, characterization and catalytic activity

AU - Renuka, N. K.

AU - Praveen, A. K.

AU - Aniz, C. U.

N1 - Funding Information: The financial assistance received from Kerala State Council for Science Technology and environment is gratefully acknowledged.

PY - 2013/3/15

Y1 - 2013/3/15

N2 - Herein, we report the synthesis, characterization, and catalytic activity of ceria rhombic micro plates obtained from aqueous cerium nitrate in presence of urea and CTAB. The material was characterized using SEM, TEM, XRD (low and wide angle), FTIR spectra, N2 adsorption, UV-DRS, and XPS analysis. The ceria consisted of plates of edge length ∼1 μm, and thickness ∼100 nm. BET surface area, and pore volume of the microplates were 57 m2/g, and 0.03 cm3/g, respectively. The particle size of the material was calculated from TEM analysis, XRD study, and BET surface area analysis. Cubic cerianite crystallites (CeO2) were detected by powder XRD, while the presence of Ce3+ was also evident from XPS and DR UV spectroscopy study. Tetravalent cerium constituted 56% of the total composition, as revealed by XPS analysis. Both Ce2O3 as well as oxygen vacancy contributed towards the presence of Ce3+ in the sample. The direct optical band gap of ceria is blue-shifted with respect to the bulk material indicating quantum-size confinement in nano crystallites in the plate structure. Bilayer assembly of CTAB has been proposed during the formation of ceria microplates. The system exhibited extremely high CO oxidation activity than the corresponding bulk oxide.

AB - Herein, we report the synthesis, characterization, and catalytic activity of ceria rhombic micro plates obtained from aqueous cerium nitrate in presence of urea and CTAB. The material was characterized using SEM, TEM, XRD (low and wide angle), FTIR spectra, N2 adsorption, UV-DRS, and XPS analysis. The ceria consisted of plates of edge length ∼1 μm, and thickness ∼100 nm. BET surface area, and pore volume of the microplates were 57 m2/g, and 0.03 cm3/g, respectively. The particle size of the material was calculated from TEM analysis, XRD study, and BET surface area analysis. Cubic cerianite crystallites (CeO2) were detected by powder XRD, while the presence of Ce3+ was also evident from XPS and DR UV spectroscopy study. Tetravalent cerium constituted 56% of the total composition, as revealed by XPS analysis. Both Ce2O3 as well as oxygen vacancy contributed towards the presence of Ce3+ in the sample. The direct optical band gap of ceria is blue-shifted with respect to the bulk material indicating quantum-size confinement in nano crystallites in the plate structure. Bilayer assembly of CTAB has been proposed during the formation of ceria microplates. The system exhibited extremely high CO oxidation activity than the corresponding bulk oxide.

KW - CO oxidation

KW - Ceria

KW - Electron microscopy

KW - Microplates

KW - XPS

UR - https://www.scopus.com/pages/publications/84869145760

U2 - 10.1016/j.micromeso.2012.10.010

DO - 10.1016/j.micromeso.2012.10.010

M3 - Article

AN - SCOPUS:84869145760

SN - 1387-1811

VL - 169

SP - 35

EP - 41

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

ER -

Ceria rhombic microplates: Synthesis, characterization and catalytic activity

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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