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Kinetic study of template removal of MCM-41 derived from rice husk ash

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Abstract

Molecular sieves MCM-41 were synthesized from rice husk ash (RHA) as alternative sources of silica, called RHA MCM-41. The material was synthesized by a hydrothermal method from a gel with the molar composition 1.00 CTMABr:4.00 SiO2:1.00 Na2O:200.00 H2O at 100 °C for 120 h with pH correction. The cetyltrimethylammonium bromide (CTMABr) was used as a structure template. The material was characterized by X-ray powder diffraction, FTIR, TG/DTG, and surface area determination by the BET method. The kinetics models proposed by Ozawa, Flynn–Wall, and Vyazovkin were used to determine the apparent activation energy for CTMA+ species decomposition from the pores of MCM-41 material. The results were compared with those obtained from the MCM-41 synthesized with silica gel. The synthesized material had specific surface area, size, and pore volume as specified by mesoporous materials developed from conventional sources of silica.

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Acknowledgements

The authors gratefully acknowledge CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for financial support and CT—INFRA/LIEM for XRD analysis.

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Authors and Affiliations

  1. NUPRAR, Universidade Federal do Rio Grande do Norte, Natal, RN, 59072-970, Brazil

    Renata M. Braga, Flávia de M. Aquino & Rodrigo C. Santiago

  2. Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal, RN, 59072-970, Brazil

    Dulce M. A. Melo & Julio Cezar de O. Freitas

  3. Departamento de Engenharia Quimica, Universidade Federal do Rio Grande do Norte, Natal, RN, 59072-970, Brazil

    Marcus A. F. Melo

  4. Centro de Educação e Saúde, Universidade Federal de Campina Grande, Unidade Acadêmica de Educação, Cuité, PB, 58175-000, Brazil

    Joana M. F. Barros

  5. Rua Industrial João Motta, 1637, Apto. 204. Capim Macio, Natal, RN, 59082-410, Brazil

    Renata M. Braga

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  1. Renata M. Braga
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  2. Joana M. F. Barros
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  3. Dulce M. A. Melo
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  4. Marcus A. F. Melo
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  5. Flávia de M. Aquino
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  6. Julio Cezar de O. Freitas
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  7. Rodrigo C. Santiago
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Correspondence to Renata M. Braga.

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Braga, R.M., Barros, J.M.F., Melo, D.M.A. et al. Kinetic study of template removal of MCM-41 derived from rice husk ash. J Therm Anal Calorim 111, 1013–1018 (2013). https://doi.org/10.1007/s10973-012-2516-y

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  • DOI: https://doi.org/10.1007/s10973-012-2516-y

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