Hybrid Postsynthetic Functionalization of Tetraethylenepentamine onto MIL-101(Cr) for Separation of CO2 from CH4

To remove CO2 from CH4, tetraethylenepentamine was grafted onto coordinatively unsaturated centers of MIL-101­(Cr) by postsynthetic functionalization: wet impregnation at 298 K, followed by grafting, drying, and washing. Compared to MIL-101­(Cr), TEPA–MIL-101­(Cr) showed 54% higher CO2 adsorption at...

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Published inEnergy & fuels Vol. 32; no. 2; pp. 1365 - 1373
Main Authors Yoon, Hyung Chul, Rallapalli, Phani Brahma Somayajulu, Beum, Hee Tae, Han, Sang Sup, Kim, Jong-Nam
Format Journal Article
LanguageEnglish
Published American Chemical Society 15.02.2018
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Summary:To remove CO2 from CH4, tetraethylenepentamine was grafted onto coordinatively unsaturated centers of MIL-101­(Cr) by postsynthetic functionalization: wet impregnation at 298 K, followed by grafting, drying, and washing. Compared to MIL-101­(Cr), TEPA–MIL-101­(Cr) showed 54% higher CO2 adsorption at 1 bar and 98% reduction of CH4 adsorption at 60 bar. The ideal adsorption solution theory (IAST) selectivity of CO2/CH4 for a binary gas mixture of 2% CO2 + 98% CH4 at 298 K and 60 bar predicted by the Toth equation was found to be 11 and 598 for ungrafted and grafted MIL-101­(Cr), respectively. Single column breakthrough tests were performed for upgrading the 2% CO2 + 98% CH4 mixture to liquefied quality of natural gas (CO2 < 50 ppm) under various operating conditions including different temperatures and total amount of purge gas at the fixed pressure of 60 bar and temperature of 298 K. At the feed flow rate of 1000 sccm, the TEPA–MIL-101­(Cr) extrudates obtained 0.89 mmol/g CO2 adsorption capacity and nearly 83% of adsorbed CO2 can be removed by regenerating extrudates at 393 K with 79 cm3/gadsorbent of total amount of purge gas.
ISSN:0887-0624
1520-5029
DOI:10.1021/acs.energyfuels.7b03382