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Stability studies on undoped and doped Mg<Subscript>2</Subscript>TiO<Subscript>4</Subscript>, obtained by the polymeric precursor method

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Summary

A series of AlMCM-41 molecular sieves were synthesized starting from a hydrogel keeping the following molar composition: 1CTMABr:4.58SiO<Subscript>2</Subscript>:(0.437+<Emphasis Type=”Italic”>X</Emphasis>)Na<Subscript>2</Subscript>O:<Emphasis Type=”Italic”>X</Emphasis>Al<Subscript>2</Subscript>O<Subscript>3</Subscript>:200H<Subscript>2</Subscript>O. Tetramethylammonium silicate (TMAS) was used as silicon source and cethyltrimethylammonium bromide (CTMABr) was used as structure template. The obtained materials were characterized by nitrogen adsorption, XRD and TG/DTG. Acid properties were determined by pyridine thermodesorption. Model-free and Flynn-Wall kinetic models were used in order to correlate the total acidity with the apparent activation energy of pyridine desorption.

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Authors and Affiliations

  1. LTM, Departamento de Qu&#237;mica/CCEN, Universidade Federal da Para&#237;ba, Campus I, CEP 58059-900, Jo&#259;o Pessoa, PB, Brazil

    M. R. S. Silva

  2. LTM, Departamento de Qu&#237;mica/CCEN, Universidade Federal da Para&#237;ba, Campus I, CEP 58059-900, Jo&#259;o Pessoa, PB, Brazil

    S. C. Souza

  3. LTM, Departamento de Qu&#237;mica/CCEN, Universidade Federal da Para&#237;ba, Campus I, CEP 58059-900, Jo&#259;o Pessoa, PB, Brazil

    I. M. G. Santos

  4. LTM, Departamento de Qu&#237;mica/CCEN, Universidade Federal da Para&#237;ba, Campus I, CEP 58059-900, Jo&#259;o Pessoa, PB, Brazil

    M. R. Cassia-Santos

  5. LTM, Departamento de Qu&#237;mica/CCEN, Universidade Federal da Para&#237;ba, Campus I, CEP 58059-900, Jo&#259;o Pessoa, PB, Brazil

    L. E. B. Soledade

  6. LTM, Departamento de Qu&#237;mica/CCEN, Universidade Federal da Para&#237;ba, Campus I, CEP 58059-900, Jo&#259;o Pessoa, PB, Brazil

    A. G. Souza

  7. Laborat&#243;rio de Solidifica&#231;&#259;o R&#225;pida/CT, UFPB, Jo&#259;o Pessoa, PB, Brazil

    S. J. G. Lima

  8. LIEC, Departamento de Qu&#237;mica, Universidade Federal de S&#259;o Carlos, S&#259;o Carlos, SP, Brazil

    E. Longo

Authors
  1. M. R. S. Silva
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  2. S. C. Souza
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  3. I. M. G. Santos
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  4. M. R. Cassia-Santos
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  5. L. E. B. Soledade
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  6. A. G. Souza
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  7. S. J. G. Lima
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  8. E. Longo
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Silva, M., Souza, S., Santos, I. et al. Stability studies on undoped and doped Mg<Subscript>2</Subscript>TiO<Subscript>4</Subscript>, obtained by the polymeric precursor method. J Therm Anal Calorim 79, 421–424 (2005). https://doi.org/10.1007/s10973-005-0077-z

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  • DOI: https://doi.org/10.1007/s10973-005-0077-z

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