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Determination of surface properties of nickel supported on HY zeolite by TG, DTA and TPR

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Summary

The effect of Ag addition on the phase transformations that occur in the Cu-10&percnt; Al alloy was studied using differential thermal analysis, scanning electron and optical microscopies and energy dispersive X-ray analysis. The results indicated that Ag addition is responsible for the separation of the reverse martensitic transformation in two stages, and for the refinement of the &agr;-phase grains. The relative amount of the &bgr;<Subscript>1</Subscript>&apos; martensitic phase, retained on slow cooling (above 2 K min<Superscript>-1</Superscript> of cooling rate), and the relative fraction of phase &agr;<Subscript> 2</Subscript> are increased. The solubility limit of Ag in the matrix is close to 6 mass&percnt; and at this concentration the maximum stability of the &bgr; -phase is reached.

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Authors and Affiliations

  1. Federal University of Rio Grande do Norte, Department of Chemistry, CP 1662, CEP 59078-970 Natal, RN, Brazil

    A. M. Garrido Pedrosa

  2. Federal University of Rio Grande do Norte, Department of Chemical Engineering, CP 1662, CEP 59078-970 Natal, RN, Brazil

    M. J. B. Souza

  3. Federal University of Rio Grande do Norte, Department of Chemistry, CP 1662, CEP 59078-970 Natal, RN, Brazil

    D. M. A. Melo

  4. Federal University of the Para&#237;ba, CCEN, Department of Chemistry, CEP 59059-900 Jo&#227;o Pessoa, PB, Brazil

    A. G. Souza

  5. Federal University of Rio Grande do Norte, Department of Chemistry, CP 1662, CEP 59078-970 Natal, RN, Brazil

    A. S. Araujo

Authors
  1. A. M. Garrido Pedrosa
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  2. M. J. B. Souza
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  3. D. M. A. Melo
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  4. A. G. Souza
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  5. A. S. Araujo
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Garrido Pedrosa, A., Souza, M., Melo, D. et al. Determination of surface properties of nickel supported on HY zeolite by TG, DTA and TPR. J Therm Anal Calorim 79, 439–443 (2005). https://doi.org/10.1007/s10973-005-0081-3

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  • DOI: https://doi.org/10.1007/s10973-005-0081-3

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