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Effects of CO2 activation of carbon aerogels leading to ultrahigh micro-meso porosity

AuthorsRasines, Gloria; Macías, Carlos; Haro Remón, Marta ; Jagiello, Jacek; Ovín Ania, María Concepción
Ultra-high micro-meso porosity
Physical activation
Textural characterization
Issue DateJan-2015
CitationMicroporous and Mesoporous Materials 209: 18-22 (2015)
AbstractWe have analyzed the effects of CO2 activation on the porosity of ultrahigh pore volume carbon aerogels. Data obtained from the new 2D-NLDFT-HS model for carbons has been compared to the results of conventional methods (BJH, t-plot, DR); all the models were applied to the desorption branch of the isotherms. Physical activation of the carbon aerogel at different burn-off degrees resulted in materials showing increasing volume of micropores and alteration of mesopore structure. The later effect manifested itself by a characteristic inflection in the desorption branch of the nitrogen isotherm at high relative pressures. Such curvatures are attributed to a non uniform activation of the carbon matrix with CO2 that in some parts carves the surface of the precursor deeper than in others, creating bimodal/multimodal pore size distributions. The different methods applied for the assessment of the textural properties of the aerogels with ultrahigh micro-/mesoporosity showed excellent agreement in terms of pore volumes, surface areas and average pore size.
Publisher version (URL)http://dx.doi.org/10.1016/j.micromeso.2015.01.011
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