Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures

Adsorption of dimethyl ether and ethene in SAPO-34 zeolite with the calorimetric (adsorption heat versus coverage) curve measured together with the adsorption isotherm showed two phases of adsorption: first, Type 1 adsorption on acid sites, and second, Type 2 adsorption elsewhere in the cages by phy...

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Detalles Bibliográficos
Autores principales: Wang, Fei, Kobayashi, Yasukazu, Li, Yuxin, Wang, Dezheng, Wang, Yao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6164996/
https://www.ncbi.nlm.nih.gov/pubmed/30158462
http://dx.doi.org/10.3390/nano8090672
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author Wang, Fei
Kobayashi, Yasukazu
Li, Yuxin
Wang, Dezheng
Wang, Yao
author_facet Wang, Fei
Kobayashi, Yasukazu
Li, Yuxin
Wang, Dezheng
Wang, Yao
author_sort Wang, Fei
collection PubMed
description Adsorption of dimethyl ether and ethene in SAPO-34 zeolite with the calorimetric (adsorption heat versus coverage) curve measured together with the adsorption isotherm showed two phases of adsorption: first, Type 1 adsorption on acid sites, and second, Type 2 adsorption elsewhere in the cages by physisorption that continued with increasing pressure. Binary gas mixture experiments showed that only the ideal adsorbed solution theory (IAST) gave correct surface concentrations, while the multicomponent Langmuir isotherm for competitive adsorption was incorrect even though the acid site concentration was the same for the adsorbates. This is because the adsorption occurred in two adsorption phases while the Langmuir isotherm model is based on a single adsorption phase.
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spelling pubmed-61649962018-10-10 Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures Wang, Fei Kobayashi, Yasukazu Li, Yuxin Wang, Dezheng Wang, Yao Nanomaterials (Basel) Article Adsorption of dimethyl ether and ethene in SAPO-34 zeolite with the calorimetric (adsorption heat versus coverage) curve measured together with the adsorption isotherm showed two phases of adsorption: first, Type 1 adsorption on acid sites, and second, Type 2 adsorption elsewhere in the cages by physisorption that continued with increasing pressure. Binary gas mixture experiments showed that only the ideal adsorbed solution theory (IAST) gave correct surface concentrations, while the multicomponent Langmuir isotherm for competitive adsorption was incorrect even though the acid site concentration was the same for the adsorbates. This is because the adsorption occurred in two adsorption phases while the Langmuir isotherm model is based on a single adsorption phase. MDPI 2018-08-29 /pmc/articles/PMC6164996/ /pubmed/30158462 http://dx.doi.org/10.3390/nano8090672 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Fei
Kobayashi, Yasukazu
Li, Yuxin
Wang, Dezheng
Wang, Yao
Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures
title Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures
title_full Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures
title_fullStr Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures
title_full_unstemmed Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures
title_short Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures
title_sort effect of nano-sized cavities in sapo-34 zeolite on thermodynamics of adsorbed gas mixtures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6164996/
https://www.ncbi.nlm.nih.gov/pubmed/30158462
http://dx.doi.org/10.3390/nano8090672
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