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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: [email protected]
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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)
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 7 , July 2007 , pp. 1787 - 1796
Copyright
Copyright © Materials Research Society 2007

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References

REFERENCES

1Busca, G., Lietti, L., Ramis, G. Berti, F.: Chemical and mechanistic aspects of the selective catalytic reduction of NOx by ammonia over oxide catalysts: A review. Appl. Catal., B 18, 1 1998Google Scholar
2Properties and Applications of Perovskite Type Oxides, edited by L.G. Tejuca and J.L.G. Fierro Marcel Dekker, New York 1993Google Scholar
3Ueda, W., Asakawa, K., Chen, C.L., Moro-oka, Y. Ikawa, T.: Catalytic properties of tricomponent metal oxides having the scheelite structure: I. Role of bulk diffusion of lattice oxide ions in the oxidation of propylene. J. Catal. 101, 360 1986CrossRefGoogle Scholar
4Ueda, W., Chen, C.L., Asakawa, K., Moro-oka, Y. Ikawa, T.: Catalytic properties of tricomponent metal oxides having the scheelite structure: II. Structural stability in the reduction-oxidation cycle. J. Catal. 101, 369 1986Google Scholar
5Belessi, V.C., Costa, C.N., Bakas, T.V., Anastasiadou, T., Pomonis, P.J., Efstathiou, A.M.: Catalytic behavior of La–Sr–Ce–Fe–O mixed oxidic/perovskitic systems for the NO+CO and NO+CH4+O2 (lean-NOx) reactions. Catal. Today 59, 347 2000CrossRefGoogle Scholar
6Balasubramanian, M.R., Natesan, R. Rajendran, P.: Correlation between catalytic activities and physicochemical properties of mixed oxides. J. Scient. Ind. Res. 43, 500 1984Google Scholar
7Isupova, I.A., Sadykov, V.A., Tsybulya, S.V., Kryukova, G.N., Ivanov, V.P., Petrov, A.N. Kononchuk, O.F.: Effect of structural disorder on the catalytic activity of mixed La-Sr-Co-Fe-O perovskites. React. Kinet. Catal. Lett. 62, 129 1997CrossRefGoogle Scholar
8Pai, M.R., Wani, B.N. Gupta, N.M.: Synthesis characterization and thermal behavior of Th-Mn-V-O oxides. J. Mater. Sci. Lett. 21, 1187 2002CrossRefGoogle Scholar
9Pai, M.R., Wani, B.N. Gupta, N.M.: The Structure–activity relationship in catalytic behavior of Th-Mn-V-O oxides. Prog. Cryst. Growth Charact. Mater. 45, 107 2002CrossRefGoogle Scholar
10Pai, M.R., Wani, B.N. Gupta, N.M.: The role of substitution-induced micro-structural defects on the redox behavior and catalytic activity of LaxTh1–x(VO3–δ)4 mixed oxide catalysts. J. Phys. Chem. Solids 67, 1502 2006CrossRefGoogle Scholar
11Pai, M.R., Wani, B.N., Belapurkar, A.D. Gupta, N.M.: Role of substitution in catalytic activity of La-Th-V-O mixed oxides for the reaction of methanol. J. Molec. Catal. A: Chem. 223, 275 2004CrossRefGoogle Scholar
12Pai, M.R., Wani, B.N. Gupta, N.M.: Effect of La substitution on thermal stability of ThV2O7. Thermochim. Acta 425, 109 2005CrossRefGoogle Scholar
13Pai, M.R., Wani, B.N., Shreedhar, B., Singh, S. Gupta, N.M.: Catalytic and redox properties of nano-sized La0.8Sr0.2Mn1–x FexO3–δ mixed oxides synthesized by different routes. J. Molec. Catal. A: Chem. 246, 128 2006CrossRefGoogle Scholar
14Kudo, A. Mikami, I.: New In2O3(ZnO)m Photocatalysts with laminal structure for visible light-induced H2 or O2 evolution from aqueous solutions containing sacrificial reagents. Chem. Lett. 27, 1027 1998Google Scholar
15Sato, J., Saito, S., Nishiyama, H. Inoue, Y.: New Photocatalyst group for water decomposition of RuO2-Loaded p-block metal (In, Sn, and Sb) oxides with d10 configuration. J. Phys. Chem. 105, 6061 2001CrossRefGoogle Scholar
16Sato, J., Saito, S., Nishiyama, H. Inoue, Y.: Photocatalytic activity for water decomposition of indates with octahedrally coordinated d10 configuration: II. Roles of geometric and electronic structures. J. Phys. Chem. 107, 7970 2003CrossRefGoogle Scholar
17Zou, Z., Ye, J., Sayama, K. Arakawa, H.: Direct splitting of water under visible light irradiation with an oxide semiconductor photocatalyst. Nature 414, 6254 2001CrossRefGoogle ScholarPubMed
18Gaewdang, J.P., Chaminade, , Gravereau, P., Garcia, A., Fouassier, C., Hagenmuller, P. Mahiou, R.: Crystal structure and luminescent properties of indium titanate. Mater. Res. Bull. 28, 1051 1993CrossRefGoogle Scholar
19Jakkal, V.S.: Powderx: A Fortran software for refining the unit cell parameters from the powder diffraction pattern, Bhabha Atomic Reserch Centre (BARC), Mumbai-400085, private communication.Google Scholar
20Bunn, C.W.: Chemical Crystallograph (translated to Japanese) Oxford University Press, Tokyo, Japan 1961Google Scholar
21JCPDS Nos. 21-1272, 06-0416, 30-0640, 30-416, 5-642, 21-1276, 06-0696. International Center for Diffraction Data, Newton Square, PA 1997Google Scholar
22Taguchi, H., Masunaga, Y., Hirota, K. Yamaguchi, O.: Synthesis of perovskite type (La1–xCax)FeO3 (0 ≤ × ≤ 0.2) at low temperature. Mater. Res. Bull. 40, 773 2005Google Scholar
23Schwerdtfeger, P., Heath, G.A., Dolg, M. Bennett, M.A.: Low valencies and periodic trends in heavy element chemistry: A theoretical study of relativistic effects and electron correlation effects in group 13 and period 6 hydrides and halides. J. Am. Chem. Soc. 114, 7518 1992CrossRefGoogle Scholar
24Cotton, F.A. Wilkinson, G.: Advanced Inorganic Chemistry, 5th ed. Wiley-Interscience, New York 1988 208Google Scholar
25Huheey, J.G.: Inorganic Chemistry, Principles of Structure and Reactivity 3rd ed. Harper and Row, New York 1983 843Google Scholar