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Zinc Containing Small-Pore Zeolites for Capture of Low Concentration Carbon Dioxide

Fu, Donglong and Park, Youngkyu and Davis, Mark E. (2022) Zinc Containing Small-Pore Zeolites for Capture of Low Concentration Carbon Dioxide. Angewandte Chemie International Edition, 61 (5). Art. No. e202112916. ISSN 1433-7851. doi:10.1002/anie.202112916. https://resolver.caltech.edu/CaltechAUTHORS:20211207-6364000

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Abstract

The capture of low concentration CO₂ presents numerous challenges. Here, we report that zinc containing chabazite (CHA) zeolites can realize high capacity, fast adsorption kinetics, and low desorption energy when capturing ca. 400 ppm CO₂. Control of the state and location of the zinc ions in the CHA cage is critical to the performance. Zn²⁺ loaded onto paired anionic sites in the six-membered rings (6MRs) in the CHA cage are the primary sites to adsorb ca. 0.51 mmol CO₂/g-zeolite with Si/Al=ca. 7, a 17-fold increase compared to the parent H-form. The capacity is increased further to ca. 0.67 mmol CO₂/g-zeolite with Si/Al=ca. 2 due to more paired sites for zinc exchange. Zeolites with double six-membered rings (D6MRs) that orient 6MRs into the cages give enhanced uptakes for CO₂ adsorption with zinc exchange. The results reveal that zinc exchanged CHA and several other small pore, cage containing zeolites merit further investigation for the capture of low concentration CO₂.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/anie.202112916DOIArticle
ORCID:
AuthorORCID
Fu, Donglong0000-0002-5680-6279
Park, Youngkyu0000-0001-7328-7565
Davis, Mark E.0000-0001-8294-1477
Additional Information:© 2021 Wiley-VCH GmbH. Issue Online: 18 January 2022; Version of Record online: 18 December 2021; Accepted manuscript online: 19 November 2021; Manuscript received: 22 September 2021. This work was financially supported by Carbon Capture, Inc. Y.P. would like to thank Kwanjeong Educational Foundation for the financial support. The authors acknowledge Dr. Stacey I. Zones (Chevron) for providing chemicals for the synthesis of the AFX-type zeolite. Faisal Alshafei (California Institute of Technology) is thanked for synthesizing the OSDA for the synthesis of the AEI-type zeolite. Conflict of interest: A US patent (application No. 63154334) related to this work has been applied by D. Fu and M. E. Davis as co-inventors. M. E. Davis is a consultant for Carbon Capture, Inc.
Funders:
Funding AgencyGrant Number
Carbon Capture, Inc.UNSPECIFIED
Kwanjeong Educational FoundationUNSPECIFIED
Subject Keywords:adsorption; carbon capture; physisorbents; small-pore zeolites; zinc
Issue or Number:5
DOI:10.1002/anie.202112916
Record Number:CaltechAUTHORS:20211207-6364000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20211207-6364000
Official Citation:Zinc Containing Small-Pore Zeolites for Capture of Low Concentration Carbon Dioxide. D. Fu, Y. Park, M. E. Davis, Angew. Chem. Int. Ed. 2022, 61, e202112916; DOI: 10.1002/ange.202112916
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112272
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:10 Dec 2021 21:02
Last Modified:15 Feb 2022 23:12

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