[n]‐Oligourea‐Based Green Sorbents with Enhanced CO2 Sorption Capacity. Issue 9 (20th April 2015)

• Record Type: Journal Article
• Authors: Qaroush, Abdussalam K.; Castillo‐Molina, Dante A.; Troll, Carsten; Abu‐Daabes, Malyuba A.; Alsyouri, Hatem M.; Abu‐Surrah, Adnan S.; Rieger, Bernhard
• Is Part Of: ChemSusChem. Volume 8:Issue 9(2015:May)
• Page Start: 1618
• Page End: 1626
• Publication Date: 2015-04-20
• Subjects: Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201402828
• Languages: English
• ISSNs: 1864-5631

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A new series of [<italic>n</italic>]‐oligoureas (<bold>[<italic>n</italic>]‐OU</bold>s, <italic>n</italic>=<bold>4</bold>, <bold>7</bold>, <bold>10</bold>, and <bold>12</bold>) 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 (<italic>T</italic><sub>d50</sub>) were ca. 350 °C for all oligomers. Urea and urethane functional groups indicated by IR spectroscopy confirmed the formation of the sorbent. The CO<sub>2</sub> capturing capacities were determined at 35 °C and 1.0 bar (gravimetric method). Accordingly, <bold>[10]‐OU</bold> had the highest CO<sub>2</sub> sorption capacity among the others (18.90 and 22.70 mg<inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgjm6shp63" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:18645631:media:CSSC201402828:tex2gif-inf-5" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext> </mml:mtext><mml:mrow><mml:mtext>CO</mml:mtext><mml:msub><mml:mtext> </mml:mtext><mml:mrow><mml:mtext>2</mml:mtext></mml:mrow></mml:msub></mml:mrow></mml:msub></mml:math></alternatives></inline-formula> g<sub>sorbent</sub><sup>−1</sup>) at two different activation temperatures (60 or 100 °C, respectively). Chemisorption was the principal mechanism for CO<sub>2</sub> capture. Cyclic CO<sub>2</sub> sorption/desorption measurements were carried out to test the recyclability of <bold>[10]‐OU</bold>. Activating the sample at 60 °C, three stable CO<sub>2</sub> sorption cycles were achieved after running the first cycle.</p> </abstract>