A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO<sub>2</sub>:CH<sub>4</sub> Adsorption Selectivity
This text reports the morphological and textural behavior of the synthesis stages of a CMK-3 carbon type using a silicon matrix of the SBA-15 type calcined at 823 K as a template. During the synthesis, three intermediate materials were obtained because of (i) the addition of sucrose to the SBA-15 te...
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MDPI AG
2022-11-01
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| Series: | Journal of Composites Science |
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| Online Access: | https://www.mdpi.com/2504-477X/6/11/344 |
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| author | Karla Quiroz-Estrada Marcos Esparza-Schulz Carlos Felipe |
| author_facet | Karla Quiroz-Estrada Marcos Esparza-Schulz Carlos Felipe |
| author_sort | Karla Quiroz-Estrada |
| collection | DOAJ |
| description | This text reports the morphological and textural behavior of the synthesis stages of a CMK-3 carbon type using a silicon matrix of the SBA-15 type calcined at 823 K as a template. During the synthesis, three intermediate materials were obtained because of (i) the addition of sucrose to the SBA-15 template (CCMK3-1st), (ii) the addition of sucrose to the CCMK3-1st material (CCMK3-2nd), and (iii) the carbonization by pyrolysis of the by-product CCMK3-2nd (CCMK3-F). The texture of the above materials was found by analyzing the N<sub>2</sub> adsorption isotherms, applying the classical adsorption theories to obtain the BET-specific surface and the meso- and micropore distributions by the BJH and Dubinin–Astakhov (DA) methods, respectively, in addition to the non-localized density functional theory (NLDFT). Similarly, with high resolution, the samples were analyzed morphologically by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Finally, the adsorption isotherms of CO<sub>2</sub> and CH<sub>4</sub> of the CMK-3 sample were obtained at six different temperatures in the interval of 243 to 303 K to evaluate the behavior of the isosteric enthalpy of adsorption (q<sub>st</sub>) and its CO<sub>2</sub>:CH<sub>4</sub> ideal selectivity. The final CMK-3 carbon presented two families of micro- and mesopores of 1.5 and 3.2 nm, nanopipe diameters of 3.5 nm, and a specific surface area of 1350 m<sup>2</sup>/g. It also presented values of 6.0 and 2.4 mmol/g adsorbed CO<sub>2</sub> and CH<sub>4</sub> at 243 K, respectively, and strong intermolecular interactions, with q<sub>st</sub> values higher than 22 kJ/mol reflected in high selectivity values for an ideal mixture of CO<sub>2</sub>:CH<sub>4</sub> (30:70%). |
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| issn | 2504-477X |
| language | English |
| last_indexed | 2024-03-09T18:57:56Z |
| publishDate | 2022-11-01 |
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| spelling | doaj.art-aa2a103d2234452588f40a007f4a81612023-11-24T05:20:43ZengMDPI AGJournal of Composites Science2504-477X2022-11-0161134410.3390/jcs6110344A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO<sub>2</sub>:CH<sub>4</sub> Adsorption SelectivityKarla Quiroz-Estrada0Marcos Esparza-Schulz1Carlos Felipe2Departamento de Química, Fisicoquímica de Superficies, Universidad Autónoma Metropolitana-Iztapalapa (UAM-I), Mexico City 09340, MexicoDepartamento de Química, Fisicoquímica de Superficies, Universidad Autónoma Metropolitana-Iztapalapa (UAM-I), Mexico City 09340, MexicoDepartamento de Biociencias e Ingeniería, CIIEMAD, Instituto Politécnico Nacional, Mexico City 07340, MexicoThis text reports the morphological and textural behavior of the synthesis stages of a CMK-3 carbon type using a silicon matrix of the SBA-15 type calcined at 823 K as a template. During the synthesis, three intermediate materials were obtained because of (i) the addition of sucrose to the SBA-15 template (CCMK3-1st), (ii) the addition of sucrose to the CCMK3-1st material (CCMK3-2nd), and (iii) the carbonization by pyrolysis of the by-product CCMK3-2nd (CCMK3-F). The texture of the above materials was found by analyzing the N<sub>2</sub> adsorption isotherms, applying the classical adsorption theories to obtain the BET-specific surface and the meso- and micropore distributions by the BJH and Dubinin–Astakhov (DA) methods, respectively, in addition to the non-localized density functional theory (NLDFT). Similarly, with high resolution, the samples were analyzed morphologically by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Finally, the adsorption isotherms of CO<sub>2</sub> and CH<sub>4</sub> of the CMK-3 sample were obtained at six different temperatures in the interval of 243 to 303 K to evaluate the behavior of the isosteric enthalpy of adsorption (q<sub>st</sub>) and its CO<sub>2</sub>:CH<sub>4</sub> ideal selectivity. The final CMK-3 carbon presented two families of micro- and mesopores of 1.5 and 3.2 nm, nanopipe diameters of 3.5 nm, and a specific surface area of 1350 m<sup>2</sup>/g. It also presented values of 6.0 and 2.4 mmol/g adsorbed CO<sub>2</sub> and CH<sub>4</sub> at 243 K, respectively, and strong intermolecular interactions, with q<sub>st</sub> values higher than 22 kJ/mol reflected in high selectivity values for an ideal mixture of CO<sub>2</sub>:CH<sub>4</sub> (30:70%).https://www.mdpi.com/2504-477X/6/11/344ordered mesoporous carbonsSBA-15CMK-3CO<sub>2</sub>:CH<sub>4</sub> selectivityq<sub>st</sub> |
| spellingShingle | Karla Quiroz-Estrada Marcos Esparza-Schulz Carlos Felipe A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO<sub>2</sub>:CH<sub>4</sub> Adsorption Selectivity Journal of Composites Science ordered mesoporous carbons SBA-15 CMK-3 CO<sub>2</sub>:CH<sub>4</sub> selectivity q<sub>st</sub> |
| title | A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO<sub>2</sub>:CH<sub>4</sub> Adsorption Selectivity |
| title_full | A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO<sub>2</sub>:CH<sub>4</sub> Adsorption Selectivity |
| title_fullStr | A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO<sub>2</sub>:CH<sub>4</sub> Adsorption Selectivity |
| title_full_unstemmed | A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO<sub>2</sub>:CH<sub>4</sub> Adsorption Selectivity |
| title_short | A Better Understanding of the SBA-15 Pores Filling through Textural Changes in CMK-3 Carbon Synthesis and Its CO<sub>2</sub>:CH<sub>4</sub> Adsorption Selectivity |
| title_sort | better understanding of the sba 15 pores filling through textural changes in cmk 3 carbon synthesis and its co sub 2 sub ch sub 4 sub adsorption selectivity |
| topic | ordered mesoporous carbons SBA-15 CMK-3 CO<sub>2</sub>:CH<sub>4</sub> selectivity q<sub>st</sub> |
| url | https://www.mdpi.com/2504-477X/6/11/344 |
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