Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 209, Issue -, Pages 18-22Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2015.01.011
Keywords
Aerogels; Ultra-high micro-meso porosity; Physical activation; Textural characterization
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Funding
- Spanish MINECO [CTM2011/023378]
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We 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. (C) 2015 Elsevier Inc. All rights reserved.
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