Effects of CO2 activation of carbon aerogels leading to ultrahigh micro-meso porosity
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Effects of CO2 activation of carbon aerogels leading to ultrahigh micro-meso porosityData de publicació
2015Editor
ElsevierISSN
1387-1811Cita bibliogràfica
RASINES, Gloria, et al. Effects of CO 2 activation of carbon aerogels leading to ultrahigh micro-meso porosity. Microporous and Mesoporous Materials, 2015, vol. 209, p. 18-22.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://www.sciencedirect.com/science/article/pii/S1387181115000232Versió
info:eu-repo/semantics/submittedVersionParaules clau / Matèries
Resum
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 ... [+]
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. [-]
Publicat a
Microporous and Mesoporous Materials, 2015, vol. 209Drets d'accés
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