A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO2:CH4 Adsorption Selectivity

This text reports the morphological and textural behavior of synthesis stages a CMK-3 carbon type using silicon matrix SBA-15 calcined at 823 K as template. During synthesis, three intermediate materials were obtained because (i) addition sucrose to template (CCMK3-1st), (ii) CCMK3-1st material (CCMK3-2nd), (iii) carbonization by pyrolysis by-product CCMK3-2nd (CCMK3-F). The texture above was found analyzing N2 adsorption isotherms, applying classical theories obtain BET-specific surface meso- micropore distributions BJH Dubinin–Astakhov (DA) methods, respectively, in non-localized density functional theory (NLDFT). Similarly, with high resolution, samples analyzed morphologically scanning electron microscopy (SEM) transmission (TEM). Finally, isotherms CO2 CH4 sample six different temperatures interval 243 303 evaluate isosteric enthalpy (qst) its CO2:CH4 ideal selectivity. final presented two families micro- mesopores 1.5 3.2 nm, nanopipe diameters 3.5 specific area 1350 m2/g. It also values 6.0 2.4 mmol/g adsorbed K, strong intermolecular interactions, qst higher than 22 kJ/mol reflected selectivity for an mixture (30:70%).