Microporous 3D Graphene-like Zeolite-Templated Carbons for Preferential Adsorption of Ethane
- 1 June 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 12 (25), 28484-28495
- https://doi.org/10.1021/acsami.0c04228
Abstract
Microporous 3D graphene-like carbons were synthesized using the recently developed Ca2+ ion-catalyzed synthesis method in Faujasite (FAU)-, EMT-, and beta-zeolite templates. The microporous carbons liberated from these large-pore zeolites (0.7–0.9 nm) retain the structural regularity of zeolite. Currently, FAU-, EMT-, and beta zeolite-templated carbons with respective faithfully constructed pore diameters of 1.2, 1.1, and 0.9 nm and very large surface areas (2,700–3,200 m2 g-1) are available. We have discovered that these schwarzite-like carbons exhibit preferential adsorption of ethane over ethylene at pressures in the range of 1–10 bar. The curved graphene structure, consisting of a diverse range of carbon polygons with a narrow pore size of ~1 nm, provides abundant adsorption sites in micropores and retains its ethane selectivity at pressures up to 10 bar. After varying the oxygen content in the beta zeolite-templated carbon, the ethane and ethylene adsorption isotherms show that the separation ability is not significantly affected by surface oxygen groups. Based on these adsorption results, a simple breakthrough separation procedure using a C2H4/C2H6 gas mixture (9:1 molar ratio) is demonstrated to produce ethylene with a purity of 99.9%.Keywords
Funding Information
- National Research Council of Science and Technology (CRC-14-1-KRICT)
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