Li+/ZSM-25 Zeolite as a CO2 Capture Adsorbent with High Selectivity and Improved Adsorption Kinetics, Showing CO2-Induced Framework Expansion

Jianhua Zhao, Ke Xie, Ranjeet Singh, Gongkui Xiao, Qinfen Gu, Qinghu Zhao, Gang Li, Penny Xiao, Paul A. Webley

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The structure of ZSM-25, a RHO family zeolite, was resolved recently. Recent reports focused on Na-ZSM-25 as a promising CO2 adsorbent with high CO2 working capacity and exceptional CO2/CH4 ideal selectivity for pressure swing adsorption. However, these reports discuss single-gas adsorption performance of Na-ZSM-25 and are unable to provide the CO2/CH4 separation behavior in practical scenarios where the adsorption is performed using mixed gases. Furthermore, Na-ZSM-25 suffers from slow adsorption kinetics that limits its industrial applications. In this study, Li+/ZSM-25 zeolites (LZZs) are developed to enhance the CO2 adsorption kinetics without compromising selectivity. The adsorption performance was examined using both single-(isotherm) and binary-(breakthrough) gas measurements. The results indicate that the CO2 adsorption rate of LZZ is 9.84 times that of Na-ZSM-25 with a simultaneous increase of the CO2 adsorption capacity by 6.1% at 303 K and 9.5 bar. The very high CO2/CH4 adsorptive selectivity is successfully inherited from Na-ZSM-25 zeolite in both single- and binary-gas adsorption. Furthermore, in situ XRD reveals CO2-induced framework expansion, which explains the origin of the high working capacity and type-II-like isotherms of the ZSM-25-based zeolites. This study implies promising application of LZZ in natural gas purification and biogas upgrading.

Original languageEnglish
Pages (from-to)18933-18941
Number of pages9
JournalJournal of Physical Chemistry C
Volume122
Issue number33
DOIs
Publication statusPublished - 23 Aug 2018

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Zeolites
adsorbents
Adsorbents
selectivity
Adsorption
Kinetics
adsorption
expansion
kinetics
zeolites
Gas adsorption
Isotherms
gases
Gas fuel purification
Gas fuel measurement
isotherms
Biofuels
Biogas
upgrading
Industrial applications

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Zhao, Jianhua ; Xie, Ke ; Singh, Ranjeet ; Xiao, Gongkui ; Gu, Qinfen ; Zhao, Qinghu ; Li, Gang ; Xiao, Penny ; Webley, Paul A. / Li+/ZSM-25 Zeolite as a CO2 Capture Adsorbent with High Selectivity and Improved Adsorption Kinetics, Showing CO2-Induced Framework Expansion. In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 33. pp. 18933-18941.
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abstract = "The structure of ZSM-25, a RHO family zeolite, was resolved recently. Recent reports focused on Na-ZSM-25 as a promising CO2 adsorbent with high CO2 working capacity and exceptional CO2/CH4 ideal selectivity for pressure swing adsorption. However, these reports discuss single-gas adsorption performance of Na-ZSM-25 and are unable to provide the CO2/CH4 separation behavior in practical scenarios where the adsorption is performed using mixed gases. Furthermore, Na-ZSM-25 suffers from slow adsorption kinetics that limits its industrial applications. In this study, Li+/ZSM-25 zeolites (LZZs) are developed to enhance the CO2 adsorption kinetics without compromising selectivity. The adsorption performance was examined using both single-(isotherm) and binary-(breakthrough) gas measurements. The results indicate that the CO2 adsorption rate of LZZ is 9.84 times that of Na-ZSM-25 with a simultaneous increase of the CO2 adsorption capacity by 6.1{\%} at 303 K and 9.5 bar. The very high CO2/CH4 adsorptive selectivity is successfully inherited from Na-ZSM-25 zeolite in both single- and binary-gas adsorption. Furthermore, in situ XRD reveals CO2-induced framework expansion, which explains the origin of the high working capacity and type-II-like isotherms of the ZSM-25-based zeolites. This study implies promising application of LZZ in natural gas purification and biogas upgrading.",
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Li+/ZSM-25 Zeolite as a CO2 Capture Adsorbent with High Selectivity and Improved Adsorption Kinetics, Showing CO2-Induced Framework Expansion. / Zhao, Jianhua; Xie, Ke; Singh, Ranjeet; Xiao, Gongkui; Gu, Qinfen; Zhao, Qinghu; Li, Gang; Xiao, Penny; Webley, Paul A.

In: Journal of Physical Chemistry C, Vol. 122, No. 33, 23.08.2018, p. 18933-18941.

Research output: Contribution to journalArticle

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T1 - Li+/ZSM-25 Zeolite as a CO2 Capture Adsorbent with High Selectivity and Improved Adsorption Kinetics, Showing CO2-Induced Framework Expansion

AU - Zhao, Jianhua

AU - Xie, Ke

AU - Singh, Ranjeet

AU - Xiao, Gongkui

AU - Gu, Qinfen

AU - Zhao, Qinghu

AU - Li, Gang

AU - Xiao, Penny

AU - Webley, Paul A.

PY - 2018/8/23

Y1 - 2018/8/23

N2 - The structure of ZSM-25, a RHO family zeolite, was resolved recently. Recent reports focused on Na-ZSM-25 as a promising CO2 adsorbent with high CO2 working capacity and exceptional CO2/CH4 ideal selectivity for pressure swing adsorption. However, these reports discuss single-gas adsorption performance of Na-ZSM-25 and are unable to provide the CO2/CH4 separation behavior in practical scenarios where the adsorption is performed using mixed gases. Furthermore, Na-ZSM-25 suffers from slow adsorption kinetics that limits its industrial applications. In this study, Li+/ZSM-25 zeolites (LZZs) are developed to enhance the CO2 adsorption kinetics without compromising selectivity. The adsorption performance was examined using both single-(isotherm) and binary-(breakthrough) gas measurements. The results indicate that the CO2 adsorption rate of LZZ is 9.84 times that of Na-ZSM-25 with a simultaneous increase of the CO2 adsorption capacity by 6.1% at 303 K and 9.5 bar. The very high CO2/CH4 adsorptive selectivity is successfully inherited from Na-ZSM-25 zeolite in both single- and binary-gas adsorption. Furthermore, in situ XRD reveals CO2-induced framework expansion, which explains the origin of the high working capacity and type-II-like isotherms of the ZSM-25-based zeolites. This study implies promising application of LZZ in natural gas purification and biogas upgrading.

AB - The structure of ZSM-25, a RHO family zeolite, was resolved recently. Recent reports focused on Na-ZSM-25 as a promising CO2 adsorbent with high CO2 working capacity and exceptional CO2/CH4 ideal selectivity for pressure swing adsorption. However, these reports discuss single-gas adsorption performance of Na-ZSM-25 and are unable to provide the CO2/CH4 separation behavior in practical scenarios where the adsorption is performed using mixed gases. Furthermore, Na-ZSM-25 suffers from slow adsorption kinetics that limits its industrial applications. In this study, Li+/ZSM-25 zeolites (LZZs) are developed to enhance the CO2 adsorption kinetics without compromising selectivity. The adsorption performance was examined using both single-(isotherm) and binary-(breakthrough) gas measurements. The results indicate that the CO2 adsorption rate of LZZ is 9.84 times that of Na-ZSM-25 with a simultaneous increase of the CO2 adsorption capacity by 6.1% at 303 K and 9.5 bar. The very high CO2/CH4 adsorptive selectivity is successfully inherited from Na-ZSM-25 zeolite in both single- and binary-gas adsorption. Furthermore, in situ XRD reveals CO2-induced framework expansion, which explains the origin of the high working capacity and type-II-like isotherms of the ZSM-25-based zeolites. This study implies promising application of LZZ in natural gas purification and biogas upgrading.

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JF - The Journal Of Physical Chemistry C

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