[ n ]‐Oligourea‐Based Green Sorbents with Enhanced CO 2 Sorption Capacity

A new series of [ n ]‐oligoureas ( [ n ]‐OU s, n = 4 , 7 , 10 , and 12 ) green solid sorbents was prepared following a base‐catalyzed, microwave‐assisted oligomerization reaction. The materials were characterized by NMR and IR spectroscopy, elemental analysis, thermogravimetric analysis, differentia...

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Veröffentlicht in:ChemSusChem 2015-05, Vol.8 (9), p.1618-1626
Hauptverfasser: Qaroush, Abdussalam K., Castillo‐Molina, Dante A., Troll, Carsten, Abu‐Daabes, Malyuba A., Alsyouri, Hatem M., Abu‐Surrah, Adnan S., Rieger, Bernhard
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Sprache:eng
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Zusammenfassung:A new series of [ n ]‐oligoureas ( [ n ]‐OU s, n = 4 , 7 , 10 , and 12 ) green solid sorbents was prepared following a base‐catalyzed, microwave‐assisted oligomerization reaction. The materials were characterized by NMR and IR spectroscopy, elemental analysis, thermogravimetric analysis, differential scanning calorimetry, and XRD. Decomposition temperatures at 50 % weight loss ( T d50 ) were ca. 350 °C for all oligomers. Urea and urethane functional groups indicated by IR spectroscopy confirmed the formation of the sorbent. The CO 2 capturing capacities were determined at 35 °C and 1.0 bar (gravimetric method). Accordingly, [10]‐OU had the highest CO 2 sorption capacity among the others (18.90 and 22.70 mg  g sorbent −1 ) at two different activation temperatures (60 or 100 °C, respectively). Chemisorption was the principal mechanism for CO 2 capture. Cyclic CO 2 sorption/desorption measurements were carried out to test the recyclability of [10]‐OU . Activating the sample at 60 °C, three stable CO 2 sorption cycles were achieved after running the first cycle.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201402828