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Title: Controlled synthesis of nanocrystalline CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Y, Ti, Pr and Fe) solid solutions by the hydrothermal method: Structure and oxygen storage capacity

Abstract

CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Ti, Pr, Y and Fe) nanocrystallites of 5-10 nm sizes have been synthesized by hydrothermal method using diethylenetriamine (DETA) and melamine as complexing agents. Compounds have been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray analysis (EDX) and their structures have been refined by the Rietveld method. All the compounds crystallize in cubic fluorite structure. Even up to 50% Zr and Y, 40% Ti, 25% Pr and 15% Fe is substituted for Ce{sup 4+} in CeO{sub 2} by this method. Sizes of crystallites can be tuned by changing the complexing agent and reaction temperature. Nanocrystalline CeO{sub 2} and Ce{sub 1-x}Zr{sub x}O{sub 2} prepared here have higher or at least competitive oxygen storage capacity (OSC) than those reported in literature. Ce{sub 1-x}Fe{sub x}O{sub 2-{delta}} shows higher OSC and higher percentage of CO oxidation at lower temperature than Ce{sub 1-x}Zr{sub x}O{sub 2}. - Graphical abstract: CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Ti, Pr, Y and Fe) nanocrystallites of 5-10 nm sizes have been synthesized by hydrothermal method using diethylenetriamine (DETA) and melamine as complexing agents. Ce{sub 1-x}Fe{sub x}O{sub 2-{delta}} shows higher OSCmore » and higher percentage of CO oxidation at lower temperature than Ce{sub 1-x}Zr{sub x}O{sub 2}. CO conversion with lattice oxygen from (a) CeO{sub 2} (5 nm), (b) Ce{sub 0.75}Zr{sub 0.25}O{sub 2}, (c) Ce{sub 0.50}Zr{sub 0.50}O{sub 2} and (d) Ce{sub 0.85}Fe{sub 0.15}O{sub 1.85}.« less

Authors:
 [1]
  1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 (India)
Publication Date:
OSTI Identifier:
21212129
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 181; Journal Issue: 12; Other Information: DOI: 10.1016/j.jssc.2008.08.018; PII: S0022-4596(08)00438-6; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CERIUM IONS; CERIUM OXIDES; CHELATING AGENTS; HYDROTHERMAL SYNTHESIS; IRON COMPOUNDS; NANOSTRUCTURES; OXIDATION; OXYGEN; PRASEODYMIUM COMPOUNDS; SOLID SOLUTIONS; TITANIUM COMPOUNDS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; YTTRIUM COMPOUNDS; ZIRCONIUM COMPOUNDS

Citation Formats

Singh, Preetam, and Hegde, M.S. Controlled synthesis of nanocrystalline CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Y, Ti, Pr and Fe) solid solutions by the hydrothermal method: Structure and oxygen storage capacity. United States: N. p., 2008. Web. doi:10.1016/j.jssc.2008.08.018.
Singh, Preetam, & Hegde, M.S. Controlled synthesis of nanocrystalline CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Y, Ti, Pr and Fe) solid solutions by the hydrothermal method: Structure and oxygen storage capacity. United States. doi:10.1016/j.jssc.2008.08.018.
Singh, Preetam, and Hegde, M.S. Mon . "Controlled synthesis of nanocrystalline CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Y, Ti, Pr and Fe) solid solutions by the hydrothermal method: Structure and oxygen storage capacity". United States. doi:10.1016/j.jssc.2008.08.018.
@article{osti_21212129,
title = {Controlled synthesis of nanocrystalline CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Y, Ti, Pr and Fe) solid solutions by the hydrothermal method: Structure and oxygen storage capacity},
author = {Singh, Preetam and Hegde, M.S.},
abstractNote = {CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Ti, Pr, Y and Fe) nanocrystallites of 5-10 nm sizes have been synthesized by hydrothermal method using diethylenetriamine (DETA) and melamine as complexing agents. Compounds have been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray analysis (EDX) and their structures have been refined by the Rietveld method. All the compounds crystallize in cubic fluorite structure. Even up to 50% Zr and Y, 40% Ti, 25% Pr and 15% Fe is substituted for Ce{sup 4+} in CeO{sub 2} by this method. Sizes of crystallites can be tuned by changing the complexing agent and reaction temperature. Nanocrystalline CeO{sub 2} and Ce{sub 1-x}Zr{sub x}O{sub 2} prepared here have higher or at least competitive oxygen storage capacity (OSC) than those reported in literature. Ce{sub 1-x}Fe{sub x}O{sub 2-{delta}} shows higher OSC and higher percentage of CO oxidation at lower temperature than Ce{sub 1-x}Zr{sub x}O{sub 2}. - Graphical abstract: CeO{sub 2} and Ce{sub 1-x}M{sub x}O{sub 2-{delta}} (M=Zr, Ti, Pr, Y and Fe) nanocrystallites of 5-10 nm sizes have been synthesized by hydrothermal method using diethylenetriamine (DETA) and melamine as complexing agents. Ce{sub 1-x}Fe{sub x}O{sub 2-{delta}} shows higher OSC and higher percentage of CO oxidation at lower temperature than Ce{sub 1-x}Zr{sub x}O{sub 2}. CO conversion with lattice oxygen from (a) CeO{sub 2} (5 nm), (b) Ce{sub 0.75}Zr{sub 0.25}O{sub 2}, (c) Ce{sub 0.50}Zr{sub 0.50}O{sub 2} and (d) Ce{sub 0.85}Fe{sub 0.15}O{sub 1.85}.},
doi = {10.1016/j.jssc.2008.08.018},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 12,
volume = 181,
place = {United States},
year = {2008},
month = {12}
}