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A study by adsorption calorimetry, effect of resorcinol/catalyst at different ratios using polar and non-polar molecules in the synthesis of carbon aerogels

R. A. Fonseca-Correa (A), M. J. Bastidas-Barranco (B), L. Giraldo (C), J. C. Moreno-Piraján (* A)

(A) Faculty of Sciences, Department of Chemistry, Research Group in Porous Solids and Calorimetry, University of the Andes. 11711 Bogotá-Colombia.
(B) Faculty of Engineering, Group destaCar, University of la Guajira. 440003 Guajira- Colombia.
(C) Faculty of Sciences, Department of Chemistry, National University of Colombia. 11001 Bogotá- Colombia.
* Corresponding author; E-mail: jumoreno@uniandes.edu.co; Fax: +571-3324366.

Carbon – Science and Technology 9/1 (2017) 47 - 64. 

© Applied Science Innovations Private Limited, India.

Full Text (OPEN ACCESS): CST-260.pdf

Keywords: Aerogels, isotherms, adsorption calorimetry, Langmuir–Sips, In-homogeneous isotherm, carbon aerogel, catalyst, catalysis, catalytic, adsorption, benzene, hexane, methane, methanol and methyl-ethyl-ketone (MEK), non-polar molecule,

Abstract: The heterogeneity and hydrophilicity of a series of aerogels were studied using adsorption calorimetry with molecules of different polarity. Four samples of carbon aerogel were synthesized with different resorcinol/catalytic (R/C) relations: 100, 200, 800 and 1500. The isotherms of N2 at -196 ◦C were determined and from these were calculated the textural parameters using the Dubinin–Astakhov (DA), Barret–Joyner–Halenda (BJH), Non-Local Density Functional Theory (NLDFT) and Quenched Solid Density Functional Theory (QSDFT) models. The adsorption isotherms of polar and non-polar molecules: benzene, hexane, methane, methanol and methyl-ethyl-ketone (MEK) were determined, as well as the differential adsorption enthalpies of these on the aerogel. The results show that the aerogels samples at low R/C have a fundamental development of micropores and at high R/C values present an additional development of mesoporosity. Adsorption isotherms of polar and non-polar molecules were adjusted to the Langmuir–Sips model and In-homogenous DA equation, respectively. Adsorption calorimetry shows that the carbon aerogels at these relations present heterogeneous surfaces that are essentially hydrophilic.

 

 


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