1. [n]-Oligourea-Based Green Sorbents with Enhanced CO2 Sorption Capacity
- Author
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Bernhard Rieger, Abdussalam K. Qaroush, Adnan S. Abu-Surrah, Hatem M. Alsyouri, Dante A. Castillo-Molina, Carsten Troll, and Malyuba A. Abu-Daabes
- Subjects
Thermogravimetric analysis ,Sorbent ,Chemistry ,Polymers ,General Chemical Engineering ,Temperature ,Infrared spectroscopy ,Sorption ,Green Chemistry Technology ,Carbon Dioxide ,Catalysis ,Polymerization ,General Energy ,Differential scanning calorimetry ,Chemisorption ,Desorption ,Pressure ,Environmental Chemistry ,Gravimetric analysis ,Organic chemistry ,General Materials Science ,Adsorption ,Amines ,Nuclear chemistry - Abstract
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.
- Published
- 2014