Nanoporosity and Isosteric Enthalpy of Adsorption of CH<sub>4</sub>, H<sub>2</sub>, and CO<sub>2</sub> on Natural Chabazite and Exchanged
This paper describes the isosteric enthalpy through narrow pores at low levels of coverage through adsorption of CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub> on pores in natural chabazite exchanged with aqueous solutions of Na<sup>+</sup>, Mg<s...
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MDPI AG
2022-06-01
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| Online Access: | https://www.mdpi.com/2297-8739/9/6/150 |
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| author | Miguel Ángel Hernández Karla Quiroz-Estrada Gabriela I. Hernandez-Salgado Roberto Ignacio Portillo Juana Deisy Santamaría-Juárez Ma de los Ángeles Velasco Efraín Rubio Vitalii Petranovskii |
| author_facet | Miguel Ángel Hernández Karla Quiroz-Estrada Gabriela I. Hernandez-Salgado Roberto Ignacio Portillo Juana Deisy Santamaría-Juárez Ma de los Ángeles Velasco Efraín Rubio Vitalii Petranovskii |
| author_sort | Miguel Ángel Hernández |
| collection | DOAJ |
| description | This paper describes the isosteric enthalpy through narrow pores at low levels of coverage through adsorption of CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub> on pores in natural chabazite exchanged with aqueous solutions of Na<sup>+</sup>, Mg<sup>2+</sup>, and Ca<sup>2+</sup> salts at different concentrations, and with variable time and temperature of treatment. Experimental data of CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub> adsorption were treated by the Freundlich and Langmuir equations. Complementarily, the degree of interaction of these gases with these zeolites was evaluated by the evolution of isosteric enthalpy of adsorption. The exchange with Mg<sup>2+</sup> and Na+ favors an increase in the adsorption capacity for CO<sub>2</sub>. while that of Ca<sup>2+</sup> and Mg<sup>2+</sup> favor adsorption through to H<sub>2</sub> and CH<sub>4</sub>. These cations occupy sites in strategic positions S4 and S4’, which are located in the channels and nanocavities of these zeolites. The presence of Ca<sup>2+</sup> and Mg<sup>2+</sup> at S4 and S4′ sites causes increased adsorption into the nanocavities and on the external area of the ion-exchanged zeolites. Depending on the conditions of the exchange treatment, Ca<sup>2+</sup> and Mg<sup>2+</sup>, and Na+ were found to be most favorable, well distributed, and accessible for CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub> adsorption. |
| first_indexed | 2024-03-09T22:30:40Z |
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| id | doaj.art-281a58b84bbb4028b5ba6e664193ec51 |
| institution | Directory Open Access Journal |
| issn | 2297-8739 |
| language | English |
| last_indexed | 2024-03-09T22:30:40Z |
| publishDate | 2022-06-01 |
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| record_format | Article |
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| spelling | doaj.art-281a58b84bbb4028b5ba6e664193ec512023-11-23T18:57:08ZengMDPI AGSeparations2297-87392022-06-019615010.3390/separations9060150Nanoporosity and Isosteric Enthalpy of Adsorption of CH<sub>4</sub>, H<sub>2</sub>, and CO<sub>2</sub> on Natural Chabazite and ExchangedMiguel Ángel Hernández0Karla Quiroz-Estrada1Gabriela I. Hernandez-Salgado2Roberto Ignacio Portillo3Juana Deisy Santamaría-Juárez4Ma de los Ángeles Velasco5Efraín Rubio6Vitalii Petranovskii7Departament of Zeolites Research, Posgraduate in Agroecology, ICUAP, Meritorious Autonomous University of Puebla, Puebla 72570, MexicoDepartment of Chemistry, Metropolitan Autonomous University-Iztapalapa, Ciudad de México 09340, MexicoDepartament of Process Engineering, Metropolitan Autonomous University-Iztapalapa, Ciudad de México 09340, MexicoFaculty of Chemical Sciences, Meritorious Autonomous University of Puebla, Puebla 72570, MexicoFaculty of Chemical Engineering, Meritorious Autonomous University of Puebla, Puebla 72570, MexicoDepartament of Zeolites Research, Posgraduate in Agroecology, ICUAP, Meritorious Autonomous University of Puebla, Puebla 72570, MexicoVinculation Center, Meritorious Autonomous University of Puebla, Puebla 72570, MexicoNanosciences Center and Nanotechnology, UNAM, Ensenada 22860, MexicoThis paper describes the isosteric enthalpy through narrow pores at low levels of coverage through adsorption of CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub> on pores in natural chabazite exchanged with aqueous solutions of Na<sup>+</sup>, Mg<sup>2+</sup>, and Ca<sup>2+</sup> salts at different concentrations, and with variable time and temperature of treatment. Experimental data of CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub> adsorption were treated by the Freundlich and Langmuir equations. Complementarily, the degree of interaction of these gases with these zeolites was evaluated by the evolution of isosteric enthalpy of adsorption. The exchange with Mg<sup>2+</sup> and Na+ favors an increase in the adsorption capacity for CO<sub>2</sub>. while that of Ca<sup>2+</sup> and Mg<sup>2+</sup> favor adsorption through to H<sub>2</sub> and CH<sub>4</sub>. These cations occupy sites in strategic positions S4 and S4’, which are located in the channels and nanocavities of these zeolites. The presence of Ca<sup>2+</sup> and Mg<sup>2+</sup> at S4 and S4′ sites causes increased adsorption into the nanocavities and on the external area of the ion-exchanged zeolites. Depending on the conditions of the exchange treatment, Ca<sup>2+</sup> and Mg<sup>2+</sup>, and Na+ were found to be most favorable, well distributed, and accessible for CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub> adsorption.https://www.mdpi.com/2297-8739/9/6/150CO<sub>2</sub>CH<sub>4</sub>H<sub>2</sub>chabaziteadsorptionnanopores |
| spellingShingle | Miguel Ángel Hernández Karla Quiroz-Estrada Gabriela I. Hernandez-Salgado Roberto Ignacio Portillo Juana Deisy Santamaría-Juárez Ma de los Ángeles Velasco Efraín Rubio Vitalii Petranovskii Nanoporosity and Isosteric Enthalpy of Adsorption of CH<sub>4</sub>, H<sub>2</sub>, and CO<sub>2</sub> on Natural Chabazite and Exchanged Separations CO<sub>2</sub> CH<sub>4</sub> H<sub>2</sub> chabazite adsorption nanopores |
| title | Nanoporosity and Isosteric Enthalpy of Adsorption of CH<sub>4</sub>, H<sub>2</sub>, and CO<sub>2</sub> on Natural Chabazite and Exchanged |
| title_full | Nanoporosity and Isosteric Enthalpy of Adsorption of CH<sub>4</sub>, H<sub>2</sub>, and CO<sub>2</sub> on Natural Chabazite and Exchanged |
| title_fullStr | Nanoporosity and Isosteric Enthalpy of Adsorption of CH<sub>4</sub>, H<sub>2</sub>, and CO<sub>2</sub> on Natural Chabazite and Exchanged |
| title_full_unstemmed | Nanoporosity and Isosteric Enthalpy of Adsorption of CH<sub>4</sub>, H<sub>2</sub>, and CO<sub>2</sub> on Natural Chabazite and Exchanged |
| title_short | Nanoporosity and Isosteric Enthalpy of Adsorption of CH<sub>4</sub>, H<sub>2</sub>, and CO<sub>2</sub> on Natural Chabazite and Exchanged |
| title_sort | nanoporosity and isosteric enthalpy of adsorption of ch sub 4 sub h sub 2 sub and co sub 2 sub on natural chabazite and exchanged |
| topic | CO<sub>2</sub> CH<sub>4</sub> H<sub>2</sub> chabazite adsorption nanopores |
| url | https://www.mdpi.com/2297-8739/9/6/150 |
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