[n]-Oligourea-Based Green Sorbents with Enhanced CO2 Sorption Capacity

Abdussalam K. Qaroush, Dante A. Castillo-Molina, Carsten Troll, Malyuba A. Abu-Daabes, Hatem M. Alsyouri, Adnan S. Abu-Surrah, Bernhard Rieger

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


A new series of [n]-oligoureas ([n]-OUs, 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 (Td50) were ca. 350 °C for all oligomers. Urea and urethane functional groups indicated by IR spectroscopy confirmed the formation of the sorbent. The CO2 capturing capacities were determined at 35 °C and 1.0 bar (gravimetric method). Accordingly, [10]-OU had the highest CO2 sorption capacity among the others (18.90 and 22.70 mg CO 2 gsorbent-1) at two different activation temperatures (60 or 100 °C, respectively). Chemisorption was the principal mechanism for CO2 capture. Cyclic CO2 sorption/desorption measurements were carried out to test the recyclability of [10]-OU. Activating the sample at 60 °C, three stable CO2 sorption cycles were achieved after running the first cycle.
Original languageEnglish (US)
Pages (from-to)1618-1626
Number of pages9
Issue number9
StatePublished - 2015
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2021-10-15
Acknowledged KAUST grant number(s): KSAC0069/UK-C0020
Acknowledgements: The work presented here is a Part of a PhD thesis of A.K.Q. A.K.Q. is thankful to King Abdullah University for Science and Technology, KAUST for the financial support of the scholarship of his PhD (project: KSAC0069/UK-C0020). Deutsche Forschungs Gemeinschaft (DFG) is also thanked for partially supporting this work (project: RI 613/17-1). Thanks are also expressed to Mr. Abdel Jaber A. Alabdallah for providing us with the Table-of-Contents Figure. In addition, Mr. Maximilian W. Hahn is also thanked for his great help upon performing the HP-TGA experiments. Thanks are also to TUM Graduate School (TUM-GS) for their help in supporting this work.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • General Energy
  • Environmental Chemistry
  • General Materials Science
  • General Chemical Engineering


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