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XPS characterization of gamma-ray induced chemisorption of oxygen in lanthanum manganate (LaMnO3)

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Abstract

Catalysis of mixed oxide LaMnO3 was studied for the decomposition of hydrogen peroxide (H2O2). The catalyst was γ-irradiated in open petri dishes, vacuum, dry oxygen and moist oxygen. LaMnO3 irradiated in moist oxygen showed highest catalytic activity. X-ray photoelectron spectroscopic (XPS) studies were carried out to investigate the surface modifications occurred during γ-irradiaiton of LaMnO3. No significant change in the surface was noticed in LaMnO3 irradiated in vacuum and dry oxygen. However, LaMnO3 irradiated in moist oxygen and in open petri dishes showed the reduction of transition metal (MN3+ to Mn2+) which in turn leads to the formation of chemisorbed superoxide ions (O −2 ) and surface carbonate species (CO 2−3 ). The latter processes decreases the electrical conductivity by trapping the charge carriers. The hydrated electron generated by the radiolysis of moisture reduces the transition metal. A qualitative molecular orbital model has been proposed for the chemisorption of O −2 on the reduced transition metal centers (Mn2+).

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References

  1. E. H. TAYLOR, Advan. Catal., 18 (1968) 111.

    Google Scholar 

  2. E. H. TAYLOR, H. W. KHON, J. Am. Chem. Soc., 79 (1957) 252.

    Google Scholar 

  3. D. S. BITTINGTON, J. H. CRAWFORD, Jr., Radiation Damage in Solids, Princeton Univ. Press, Princeton, NJ, 1961.

    Google Scholar 

  4. R. COEKELBERGS, A. CRUCQ, A. FRENNETT, Advan. Catal., 13 (1962) 55.

    Google Scholar 

  5. J. B. GOODENOUGH, J. Appl. Phys., 37 (1966) 1415.

    Google Scholar 

  6. R. J. H. VOORHOEVE, D. W. JOHNSON, Jr., J. P. REMEIKA, P. K. GALLAGHER, Science, 195 (1977) 827.

    Google Scholar 

  7. F. S. GALASSO, Structure, Properties and Preparation of Perovskite Type Compounds, Pergmon, Oxford, UK, 1969.

    Google Scholar 

  8. B. SRINIVAS, V. R. S. RAO, J. C. KURIACOSE, J. Radioanal. Nucl. Chem., 107 (1986) 225.

    Google Scholar 

  9. M. O. DELCOURT, J. BELLONI, J. L. MARIGNIER, C. MORY, C. COLLIEX, Radiat. Phys. Chem., 23 (1984) 485.

    Google Scholar 

  10. J. H. BURNESS, J. G. DILLARD, L. T. TAYLOR, J. Am. Chem. Soc., 97 (1975) 6080.

    Google Scholar 

  11. D. A. YOUNG, J. Phys. Chem. Solids, 15 (1960) 119.

    Google Scholar 

  12. I. MAXIM, T. BRAUN, J. Phys. Chem. Solids, 24 (1963) 537.

    Google Scholar 

  13. G. A. RODLEY, W. T. ROBINSON, Nature, 235 (1972) 438.

    PubMed  Google Scholar 

  14. S. WYSOCKI, H. SUGIER, Radiochem. Radioanal. Lett., 40 (1979) 277.

    Google Scholar 

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  1. B. Srinivas

    Present address: Dept. of Polymer Science, The Univ. of Southern Mississippi, 39406, Hattiesburg, MS, USA

Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology, 600036, Madras, India

    B. Srinivas & V. R. S. Rao

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  1. B. Srinivas
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  2. V. R. S. Rao
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Srinivas, B., Rao, V.R.S. XPS characterization of gamma-ray induced chemisorption of oxygen in lanthanum manganate (LaMnO3). Journal of Radioanalytical and Nuclear Chemistry Articles 191, 35–44 (1995). https://doi.org/10.1007/BF02035982

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