Adsorption of CO2 with tetraethylammonium glycine ionic liquid modified alumina in the Rotating Adsorption Bed. (April 2022)

• Record Type: Journal Article
• Authors: Ren, Huiyun; Shen, Hongyan; Liu, Youzhi
• Is Part Of: Journal of CO₂ utilization. Volume 58(2022)
• Publication Date: 2022-04
• Subjects: CO2 -- Tetraethylammonium glycine IL -- Alumina -- Rotating Adsorption Bed; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2022.101925
• Languages: English
• ISSNs: 2212-9820

Abstract

Abstract: CO2 capture and reuse have become the crucial task for controlling severe climate changes. Based on the practical application problems related to high viscosity of the ionic liquids (ILs) in the CO2 absorption process, the new adsorbent was obtained by loading the tetraethylammonium glycine (N2222 Gly) on millimeter-scale microspheres of alumina (Al2 O3 ) with ultrasonic impregnation-filtration method in this text. The results shown that the N2222 Gly was successfully and uniformly loaded on the surface and pore structure of the Al2 O3 by the electrostatic interaction between glycine anion and the positively charged Al2 O3 interface. The prepared adsorbent (N2222 Gly-Al2 O3 ) were filled in the Rotating Adsorption Bed (RAB), and a rapidly updated gas-solid interface area was formed when the RAB was rotating under the drive of the motor. Under the rotating dynamic environment, more active sites of N2222 Gly-Al2 O3 were exposed to CO2 and the mass transfer effect between gas-solid was effectively enhanced. The adsorption capacity in the RAB was equal to 15.94 mg·g −1, and was about 4.63 mg·g −1 higher than in the fixed bed. In addition, the RAB showed a seductive strengthening effect with the decrease in adsorption capacity of only 14.5% after six desorption operations (much less than the 30.5% decrease in the fixed bed). Interestingly, as a new type of adsorption device, the RAB enhanced the internal and external diffusion rates of the adsorption process, providing a new idea for the effective adsorption of CO2 at low partial pressure with presence of the N2222 Gly-Al2 O3 . Graphical Abstract: ga1 Highlights: N2222 Gly was successfully and uniformly loaded on Al2 O3 by electrostatic interaction. Large and rapidly updated gas-solid interface was formed in the RAB with dynamic adsorbents. The rate of external and internal diffusion in the RAB was higher than fixed bed.