Structural characterization and catalytic evaluation of transition and rare earth metal doped ceria-based solid solutions for elemental mercury oxidation

Deshetti, J, Tur, K, Ippolito, S, Sabri, Y, Tardio, J, Bhargava, S and Reddy, B 2013, 'Structural characterization and catalytic evaluation of transition and rare earth metal doped ceria-based solid solutions for elemental mercury oxidation', RSC Advances, vol. 3, no. 31, pp. 12963-12974.


Document type: Journal Article
Collection: Journal Articles

Title Structural characterization and catalytic evaluation of transition and rare earth metal doped ceria-based solid solutions for elemental mercury oxidation
Author(s) Deshetti, J
Tur, K
Ippolito, S
Sabri, Y
Tardio, J
Bhargava, S
Reddy, B
Year 2013
Journal name RSC Advances
Volume number 3
Issue number 31
Start page 12963
End page 12974
Total pages 12
Publisher RSC Publications
Abstract The catalytic behavior of various CeO2-based solid solutions, namely, Ce12xTMxO22d (TM = Mn, Fe, or Zr) and Ce12xRExO22d (RE = Pr, La, or Sm) was studied for the removal of elemental mercury (Hg0) from coalderived flue gas by catalytic oxidation (Hg0 A Hg2+). The investigated catalysts were synthesized by a coprecipitation method and characterized by various techniques, namely, X-ray diffraction (XRD), Raman spectroscopy (RS), high-resolution electron microscopy (HREM), Brunauer-Emmett-Teller (BET) surface area, X-ray photoelectron spectroscopy (XPS), temperature programmed reduction (TPR), and diffuse reflectance spectroscopy (UV-DRS). The XRD results confirmed the incorporation of Mn, Fe, Zr, La, Pr, and Sm cations into the CeO2 lattice and the formation of nanocrystalline solid solutions. The TEM measurements established the nanocrystalline nature of the solid solutions. The RS measurements suggested that the substitution process promotes the formation of oxygen vacancies, which hastens the diffusion rate of oxygen and improves the Hg oxidation. UV-vis DRS studies demonstrated the presence of the charge transfer transitions O22ACe3+ and O22ACe4+. The XPS and H2-TPR results suggested that the reduction of Ce4+ A Ce3+ is the foremost reason for the increase in oxygen vacancies, which are beneficial for Hg0 removal. The order of mercury oxidation activity over various doped catalysts is as follows: CM > CL > CZ > CF > CS > C > CP.
Subject Catalysis and Mechanisms of Reactions
Chemical Sciences not elsewhere classified
Keyword(s) flue-gas
raman-spectroscopy
mixed oxides
fly-ash
removal
coal
combustion
adsorption
nanocomposites
enhancement
DOI - identifier 10.1039/c3ra41441h
Copyright notice This journal is © The Royal Society of Chemistry 2013
ISSN 2046-2069
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