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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Main Authors:	Fei Wang, Yasukazu Kobayashi, Yuxin Li, Dezheng Wang, Yao Wang
Format:	Article
Language:	English
Published:	MDPI AG 2018-08-01
Series:	Nanomaterials
Subjects:	IAST nano-sized cavity microporous zeolite gas mixture adsorption multicomponent Langmuir isotherm competitive adsorption catalyst surface concentration
Online Access:	http://www.mdpi.com/2079-4991/8/9/672

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spelling	doaj-b93dd09cfaef4baebce797dec5ff182c2020-11-24T21:27:21ZengMDPI AGNanomaterials2079-49912018-08-018967210.3390/nano8090672nano8090672Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas MixturesFei Wang0Yasukazu Kobayashi1Yuxin Li2Dezheng Wang3Yao Wang4Department of Chemical Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Chemical Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Chemical Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Chemical Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Chemical Engineering, Tsinghua University, Beijing 100084, ChinaAdsorption 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.http://www.mdpi.com/2079-4991/8/9/672IASTnano-sized cavitymicroporous zeolitegas mixture adsorptionmulticomponent Langmuir isothermcompetitive adsorptioncatalyst surface concentration
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Fei Wang Yasukazu Kobayashi Yuxin Li Dezheng Wang Yao Wang
spellingShingle	Fei Wang Yasukazu Kobayashi Yuxin Li Dezheng Wang Yao Wang Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures Nanomaterials IAST nano-sized cavity microporous zeolite gas mixture adsorption multicomponent Langmuir isotherm competitive adsorption catalyst surface concentration
author_facet	Fei Wang Yasukazu Kobayashi Yuxin Li Dezheng Wang Yao Wang
author_sort	Fei Wang
title	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_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_sort	effect of nano-sized cavities in sapo-34 zeolite on thermodynamics of adsorbed gas mixtures
publisher	MDPI AG
series	Nanomaterials
issn	2079-4991
publishDate	2018-08-01
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.
topic	IAST nano-sized cavity microporous zeolite gas mixture adsorption multicomponent Langmuir isotherm competitive adsorption catalyst surface concentration
url	http://www.mdpi.com/2079-4991/8/9/672
work_keys_str_mv	AT feiwang effectofnanosizedcavitiesinsapo34zeoliteonthermodynamicsofadsorbedgasmixtures AT yasukazukobayashi effectofnanosizedcavitiesinsapo34zeoliteonthermodynamicsofadsorbedgasmixtures AT yuxinli effectofnanosizedcavitiesinsapo34zeoliteonthermodynamicsofadsorbedgasmixtures AT dezhengwang effectofnanosizedcavitiesinsapo34zeoliteonthermodynamicsofadsorbedgasmixtures AT yaowang effectofnanosizedcavitiesinsapo34zeoliteonthermodynamicsofadsorbedgasmixtures
_version_	1725975169781989376

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

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