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Synthesis, characterization, thermal stability and redox behavior of In3+2Ti4+1–xTm3+xO5–δ, (Tm = Fe3+ and Cr3+, 0.0 ≤ x ≤ 0.2) mixed-oxide catalysts

Published online by Cambridge University Press:  31 January 2011

M.R. Pai ,
A.M. Banerjee ,
S.R. Bharadwaj  and
S.K. Kulshreshtha
M.R. Pai
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai–400 085, India
A.M. Banerjee
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai–400 085, India
S.R. Bharadwaj*
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai–400 085, India
S.K. Kulshreshtha
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai–400 085, India
*
a)Address all correspondence to this author. e-mail: shyamala@barc.gov.in
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Abstract

Mixed metal oxide catalysts with nominal compositions of In2Ti1–xFexO5–δ, In2Ti1–xCrxO5–δ, where 0.0 ≤ x ≤ 0.2, have been synthesized by the ceramic route and characterized using the powder x-ray diffraction technique. The In2Ti1–xFexO5–δ samples were single-phase compositions, isomorphic with In2TiO5 phase. The particle size of the In2Ti1–xFexO5–δ samples was lower compared to the parent In2TiO5 oxide. Thermal stability (by thermogravimetry-differential thermal analysis) in varying atmospheres, and temperature-programmed reduction (TPR)/temperature-programmed oxidation cycles have been recorded to investigate their redox behavior as a function of the value of x in this study. The amount of H2 consumed under TPR curves was correlated with the nonstoichiometry generated in the In2Ti1–xFexO5–δ samples. Fe substitution induced ease in the reducibility (i.e., maximum temperature) of the substituted oxides compared to that in In2TiO5. X-ray photoelectron spectroscopy has been used to confirm the oxidation states of indium and other metal ions in fresh and reduced samples.

Keywords

Thermogravimetric analysis (TGA)X-ray photoelectron spectroscopy (XPS)X-ray diffraction (XRD)

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Type
Articles
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Journal of Materials Research , Volume 22 , Issue 7 , July 2007 , pp. 1787 - 1796
Copyright
Copyright © Materials Research Society 2007

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