Regulating adsorption performance of zeolites by pre-activation in electric fields

Kaifei Chen, Zhi Yu, Seyed Hesam Mousavi, Ranjeet Singh, Qinfen Gu, Randall Q. Snurr, Paul A. Webley () and Gang Kevin Li ()
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Kaifei Chen: The University of Melbourne
Zhi Yu: The University of Melbourne
Seyed Hesam Mousavi: The University of Melbourne
Ranjeet Singh: The University of Melbourne
Qinfen Gu: Australian Synchrotron, ANSTO
Randall Q. Snurr: Northwestern University
Paul A. Webley: Monash University
Gang Kevin Li: The University of Melbourne

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract While multiple external stimuli (e.g., temperature, light, pressure) have been reported to regulate gas adsorption, limited studies have been conducted on controlling molecular admission in nanopores through the application of electric fields (E-field). Here we show gas adsorption capacity and selectivity in zeolite molecular sieves can be regulated by an external E-field. Through E-field pre-activation during degassing, several zeolites exhibited enhanced CO2 adsorption and decreased CH4 and N2 adsorptions, improving the CO2/CH4 and CO2/N2 separation selectivity by at least 25%. The enhanced separation performance of the zeolites pre-activated by E-field was maintained in multiple adsorption/desorption cycles. Powder X-ray diffraction analysis and ab initio computational studies revealed that the cation relocation and framework expansion induced by the E-field accounted for the changes in gas adsorption capacities. These findings demonstrate a regulation approach to sharpen the molecular sieving capability by E-fields and open new avenues for carbon capture and molecular separations.

Date: 2023
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DOI: 10.1038/s41467-023-41227-4

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