title: [n]-Oligourea-Based Green Sorbents with Enhanced CO2 Sorption Capacity.
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.
authors.affiliation: WACKER-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching bei München (Germany). abdussalam.qaroush@tum.de.
authors.forename: Abdussalam K
authors.initials: AK
authors.lastname: Qaroush
authors.affiliation: WACKER-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching bei München (Germany).
authors.forename: Dante A
authors.initials: DA
authors.lastname: Castillo-Molina
authors.affiliation: WACKER-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching bei München (Germany).
authors.forename: Carsten
authors.initials: C
authors.lastname: Troll
authors.affiliation: Pharmaceutical and Chemical Engineering Department, German Jordanian University, P.O. Box: 35247 Amman 11180 (Jordan).
authors.forename: Malyuba A
authors.initials: MA
authors.lastname: Abu-Daabes
authors.affiliation: Department of Chemical Engineering, The University of Jordan, 11942 Amman (Jordan).
authors.forename: Hatem M
authors.initials: HM
authors.lastname: Alsyouri
authors.affiliation: Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, P.O. Box 2713, Doha (Qatar).
authors.forename: Adnan S
authors.initials: AS
authors.lastname: Abu-Surrah
authors.affiliation: WACKER-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching bei München (Germany). rieger@tum.de.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Rieger
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry* / Q000302:isolation & purification; D002384:Catalysis; D055772:Green Chemistry Technology; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D011312:Pressure; D013696:Temperature
chemical_list: D000588:Amines; D011108:Polymers; D002245:Carbon Dioxide; C045786:polyurea
keywords: [n]-oligourea; carbon dioxide storage; chemisorption; green sorbent; non-porous material