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Article

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

1
Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
2
Key Lab Orogen Belts Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
*
Author to whom correspondence should be addressed.
Present address: Department of Chemical System Engineering, Bunkyo Ku, 7-3-1 Hongo, The University of Tokyo, Tokyo 1138656, Japan.
Nanomaterials 2018, 8(9), 672; https://doi.org/10.3390/nano8090672
Received: 13 August 2018 / Revised: 24 August 2018 / Accepted: 25 August 2018 / Published: 29 August 2018
(This article belongs to the Special Issue Nanosized Zeolites and their Applications)
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. View Full-Text
Keywords: IAST; nano-sized cavity; microporous zeolite; gas mixture adsorption; multicomponent Langmuir isotherm; competitive adsorption; catalyst surface concentration IAST; nano-sized cavity; microporous zeolite; gas mixture adsorption; multicomponent Langmuir isotherm; competitive adsorption; catalyst surface concentration
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MDPI and ACS Style

Wang, F.; Kobayashi, Y.; Li, Y.; Wang, D.; Wang, Y. Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures. Nanomaterials 2018, 8, 672. https://doi.org/10.3390/nano8090672

AMA Style

Wang F, Kobayashi Y, Li Y, Wang D, Wang Y. Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures. Nanomaterials. 2018; 8(9):672. https://doi.org/10.3390/nano8090672

Chicago/Turabian Style

Wang, Fei, Yasukazu Kobayashi, Yuxin Li, Dezheng Wang, and Yao Wang. 2018. "Effect of Nano-Sized Cavities in SAPO-34 Zeolite on Thermodynamics of Adsorbed Gas Mixtures" Nanomaterials 8, no. 9: 672. https://doi.org/10.3390/nano8090672

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