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CO2/CH4 adsorption separation process using pore expanded mesoporous silicas functionalizated by APTES grafting

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Abstract

In this work we have studied the CO2 adsorption capacity and CO2/CH4 separation on several APTES-grafted mesoporous silicas of SBA-15 type. The synthesis was modified in order to obtain pore expanded materials, and post synthesis functionalization was carried out by grafting with APTES (by immersion in 20 % v/v solution). The samples were characterized by elemental (CNH) analysis, X-ray diffraction, N2 adsorption–desorption isotherms at −196 °C, and TGA. To test the CO2 adsorption capacity and CO2/CH4 separation of all samples, a gravimetric method with a magnetic suspension balance (Rubotherm, Germany) was used. Monocomponent and mixture adsorption isotherms were measured at 25 °C. All isotherms were recorded to 10 bar. Monocomponent experimental data were fitted to Langmuir and Dual-site Langmuir models and the mixture experimental data were well fitted to Multiregion Extended Langmuir combined with Dualsite Langmuir model, achieving a good correlation between experimental and simulated data.

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Acknowledgments

We thank project CTQ2012-37925-C03-03 (Ministerio de Economía y Competitividad) and FEDER funds, project RNM 1565 (Excelencia, Junta de Andalucía) and European project 295156 FP7-PEOPLE-2011-IRSES for financial support. E. Vilarrasa-Garcia thanks CAPES/PNPD (Brazilian Ministry of Education) for post-doctoral fellowship.

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Authors and Affiliations

  1. Departamento de Engenharia Química, GPSA-Grupo de Pesquisa em Separações por Adsorção, Universidade Federal do Ceará, Campus do Pici, Fortaleza, Ceará, 60455-760, Brazil

    E. Vilarrasa-García, M. Bastos-Neto, C. L. Cavalcante Jr. & D. C. S. Azevedo

  2. Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, 29071, Málaga, Spain

    E. Vilarrasa-García, J. A. Cecilia & E. Rodriguez-Castellón

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  1. E. Vilarrasa-García
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  2. J. A. Cecilia
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  3. M. Bastos-Neto
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  4. C. L. Cavalcante Jr.
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  5. D. C. S. Azevedo
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  6. E. Rodriguez-Castellón
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Correspondence to D. C. S. Azevedo or E. Rodriguez-Castellón.

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Vilarrasa-García, E., Cecilia, J.A., Bastos-Neto, M. et al. CO2/CH4 adsorption separation process using pore expanded mesoporous silicas functionalizated by APTES grafting. Adsorption 21, 565–575 (2015). https://doi.org/10.1007/s10450-015-9700-x

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  • DOI: https://doi.org/10.1007/s10450-015-9700-x

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