Triggered Gate Opening and Breathing Effects during Selective CO2 Adsorption by Merlinoite Zeolite

Journal of the American Chemical Society
Veselina M GeorgievaPaul A Wright

Abstract

Zeolites with flexible structures that adapt to coordinate extraframework cations when dehydrated show a rich variety of gas adsorption behavior and can be tuned to optimize kinetics and selectivity. Merlinoite zeolite (topology type MER) with Si/Al = 3.8 has been prepared in Na, K, and Cs forms and its structural response to dehydration measured: the unit cell volumes decrease by 9.8%, 7.7%, and 7.1% for Na-, K-, and Cs-MER, respectively. Na-MER adopts Immm symmetry, while K- and Cs-MER display P42/nmc symmetry, the difference attributed to the preferred locations of the smaller and larger cations. Their performance in CO2 adsorption has been measured by single-component isotherms and by mixed gas (CO2/CH4/He) breakthrough experiments. The differing behavior of the cation forms can be related to structural changes during CO2 uptake measured by variable-pressure PXRD. All show a "breathing" transition from narrow to wide pore forms. Na- and Cs-MER show non-Type I isotherms and kinetically-limited CO2 adsorption and delivery of pure CH4 in CO2/CH4 separation. However, K-MER shows good uptake of CO2 (3.5 mmol g-1 at 1 bar and 298 K), rapid adsorption and desorption kinetics, and promising CO2/CH4 separation. Furthermore, the narr...Continue Reading

References

Sep 18, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Miguel PalominoSusana Valencia
Apr 30, 2010·Chemical Communications : Chem Comm·Qingling LiuNiklas Hedin
Nov 23, 2011·Chemical Communications : Chem Comm·Miguel PalominoSusana Valencia
Nov 1, 2012·Journal of the American Chemical Society·Jin ShangPaul A Webley
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Jun 10, 2017·Nature Communications·Gang Kevin LiEric F May

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Citations

May 28, 2020·Chemical Society Reviews·Gurwinder SinghAjayan Vinu
Oct 23, 2020·Angewandte Chemie·Hyun June ChoiSuk Bong Hong
May 28, 2021·Chemical Communications : Chem Comm·Donglin HeAndrew I Cooper
Nov 19, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Le XuAlexander Katz

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