Ceria-samarium binary metal oxides

A comparative approach towards structural properties and soot oxidation activity

Anjana P. Anantharaman, J. Geethu, Mohammed Rishab P, Hari Prasad Dasari, Jong Ho Lee, Harshini Dasari, G. Uday Bhaskar Babu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Binary metal oxides of CeO2-Sm2O3 (CSx, x varies from 10 to 90 mol%) along with pure CeO2 and Sm2O3 were synthesised successfully by the EDTA-Citrate method. From XRD, Raman spectroscopy and UV–vis DRS results, the whole composition of metal oxides exist in three phases: (fluorite phase (F) (CS10-CS30), bi-phase (fluorite (F) + cubic (C)) (CS30-CS90) and cubic phase (C) (Sm2O3)). For CSx samples, the calculated band gap energy values obtained from the UV–vis DRS results were in between 3.0–5.1 eV and fluorite phase samples (CS10–CS30) displayed lower band gap energy values (3.04–3.07 eV) than compared to the samples in other phases. Similarly, from XPS analysis, fluorite phase samples (CS10–CS30) showed higher surface oxygen vacancy concentration than compared to samples in other phases. Catalytic activity for soot oxidation is carried out on CSx samples, and the T50 temperature is in between 480–540 °C. Fluorite phase samples (CS10 CS30) showed higher surface area, lower degree of agglomeration, lower band gap energy, higher oxygen vacancy concentration and better catalytic activity for soot oxidation. Among all the CSx samples, CS10 sample displayed highest surface area (38 m2/g), lowest degree of agglomeration (0.36), lowest band gap energy (3.04 eV), highest oxygen vacancy concentration (64%) and highest soot oxidation activity (T50 = 480 °C). The order of the soot oxidation activity of CSx samples followed the same trend of band gap energy values.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalMolecular Catalysis
Volume451
DOIs
Publication statusPublished - 01-05-2018
Externally publishedYes

Fingerprint

Samarium
Soot
Fluorspar
samarium
Cerium compounds
soot
Oxides
metal oxides
Structural properties
Energy gap
Metals
Oxygen vacancies
Oxidation
oxidation
fluorite
Catalyst activity
Agglomeration
Ethylenediaminetetraacetic acid
agglomeration
Edetic Acid

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

Cite this

Anantharaman, A. P., Geethu, J., P, M. R., Dasari, H. P., Lee, J. H., Dasari, H., & Bhaskar Babu, G. U. (2018). Ceria-samarium binary metal oxides: A comparative approach towards structural properties and soot oxidation activity. Molecular Catalysis, 451, 247-254. https://doi.org/10.1016/j.mcat.2018.01.033
Anantharaman, Anjana P. ; Geethu, J. ; P, Mohammed Rishab ; Dasari, Hari Prasad ; Lee, Jong Ho ; Dasari, Harshini ; Bhaskar Babu, G. Uday. / Ceria-samarium binary metal oxides : A comparative approach towards structural properties and soot oxidation activity. In: Molecular Catalysis. 2018 ; Vol. 451. pp. 247-254.
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abstract = "Binary metal oxides of CeO2-Sm2O3 (CSx, x varies from 10 to 90 mol{\%}) along with pure CeO2 and Sm2O3 were synthesised successfully by the EDTA-Citrate method. From XRD, Raman spectroscopy and UV–vis DRS results, the whole composition of metal oxides exist in three phases: (fluorite phase (F) (CS10-CS30), bi-phase (fluorite (F) + cubic (C)) (CS30-CS90) and cubic phase (C) (Sm2O3)). For CSx samples, the calculated band gap energy values obtained from the UV–vis DRS results were in between 3.0–5.1 eV and fluorite phase samples (CS10–CS30) displayed lower band gap energy values (3.04–3.07 eV) than compared to the samples in other phases. Similarly, from XPS analysis, fluorite phase samples (CS10–CS30) showed higher surface oxygen vacancy concentration than compared to samples in other phases. Catalytic activity for soot oxidation is carried out on CSx samples, and the T50 temperature is in between 480–540 °C. Fluorite phase samples (CS10 CS30) showed higher surface area, lower degree of agglomeration, lower band gap energy, higher oxygen vacancy concentration and better catalytic activity for soot oxidation. Among all the CSx samples, CS10 sample displayed highest surface area (38 m2/g), lowest degree of agglomeration (0.36), lowest band gap energy (3.04 eV), highest oxygen vacancy concentration (64{\%}) and highest soot oxidation activity (T50 = 480 °C). The order of the soot oxidation activity of CSx samples followed the same trend of band gap energy values.",
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Anantharaman, AP, Geethu, J, P, MR, Dasari, HP, Lee, JH, Dasari, H & Bhaskar Babu, GU 2018, 'Ceria-samarium binary metal oxides: A comparative approach towards structural properties and soot oxidation activity', Molecular Catalysis, vol. 451, pp. 247-254. https://doi.org/10.1016/j.mcat.2018.01.033

Ceria-samarium binary metal oxides : A comparative approach towards structural properties and soot oxidation activity. / Anantharaman, Anjana P.; Geethu, J.; P, Mohammed Rishab; Dasari, Hari Prasad; Lee, Jong Ho; Dasari, Harshini; Bhaskar Babu, G. Uday.

In: Molecular Catalysis, Vol. 451, 01.05.2018, p. 247-254.

Research output: Contribution to journalArticle

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T1 - Ceria-samarium binary metal oxides

T2 - A comparative approach towards structural properties and soot oxidation activity

AU - Anantharaman, Anjana P.

AU - Geethu, J.

AU - P, Mohammed Rishab

AU - Dasari, Hari Prasad

AU - Lee, Jong Ho

AU - Dasari, Harshini

AU - Bhaskar Babu, G. Uday

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