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Kinetic study of template removal of Al-MCM-41 synthesized at room temperature

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Abstract

The Al-MCM-41 molecular sieve with Si/Al = 20 molar ratio was synthesized at room temperature and characterized by X-ray diffractometry, surface area, thermogravimetry, and infrared spectroscopy. The kinetic study was conducted by Vyazovkin and Ozawa method, in order to verify the activation energy during the Hofmann degradation between 130 and 370 °C, in which most of surfactant removal occurs. The results suggest that the activation energy for template removal is close to 80 kJ mol−1 lower in Al-MCM-41 synthesized at room temperature, when compared to results obtained for mesopores Al-MCM-41 and MCM-41 synthesized by hydrothermal method. This lower activation energy may be understood as consequence of textural properties, such as higher pore size.

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Acknowledgements

C. P. de Macedo thanks CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for the doctoral scholarship, and also CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and FAPESPA (Fundação de Amparo à Pesquisa do estado do Pará) for financial support.

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Authors and Affiliations

  1. Laboratório de Catálise e Oleoquímica, Faculdade de Química, Instituto de Ciências Naturais, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil

    Cristiane P. de Macedo, Charles A. B. Negrão, José R. Zamian, Geraldo N. da Rocha Filho & Carlos E. F. da Costa

  2. Faculdade de Biotecnologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil

    Luiz G. M. de Macedo

Authors
  1. Cristiane P. de Macedo
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  2. Charles A. B. Negrão
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  3. Luiz G. M. de Macedo
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  4. José R. Zamian
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  5. Geraldo N. da Rocha Filho
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  6. Carlos E. F. da Costa
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Correspondence to Luiz G. M. de Macedo.

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de Macedo, C.P., Negrão, C.A.B., de Macedo, L.G.M. et al. Kinetic study of template removal of Al-MCM-41 synthesized at room temperature. J Therm Anal Calorim 115, 31–36 (2014). https://doi.org/10.1007/s10973-013-3267-0

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  • DOI: https://doi.org/10.1007/s10973-013-3267-0

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