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Review of nanoabsorbents for capture enhancement of CO2 and its industrial applications with design criteria

Authors
Lee, Jae WonKim, SeonggonPineda, Israel TorresKang, Yong Tae
Issue Date
3월-2021
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
CO2 absorption; CO2 capture; CO2 regeneration; Mass-transfer enhancement; Nanoabsorbents; Nanomaterials
Citation
RENEWABLE & SUSTAINABLE ENERGY REVIEWS, v.138
Indexed
SCIE
SCOPUS
Journal Title
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
Volume
138
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/49526
DOI
10.1016/j.rser.2020.110524
ISSN
1364-0321
Abstract
Nanoabsorbents manufactured by dispersing nanomaterials in liquid absorbents have attracted considerable attention from researchers and exhibit various promising applications because of their excellent heat- and mass-transfer characteristics. Therefore, many experimental and theoretical studies have been conducted recently to investigate the mass-transfer performance enhancement of nanoabsorbents in different fields. This paper reviews the mass-transfer characteristics and enhancement mechanisms of nanoabsorbents for CO2 capture. The proposed enhancement mechanisms are discussed in terms of both absorption (bubble breaking, shuttle, and interfacial mixing effects) and regeneration (activation energy, thermal, and surface effects) processes using nanoabsorbents. The results of laboratory-scale experiments and parametrical analysis indicate that the CO2 absorption performance of nanomaterials is maximized when they exhibit a high surface area, high thermal conductivity, small cluster size, and magnetic properties, which can be explained using the proposed theoretical models. Based on this, the following selection criteria for nanomaterials to maximize the CO2 absorption/regeneration performance are proposed: thermophysical properties, powder/cluster size, concentration, and addition of nanoabsorbents. In the future, mass-transfer studies need to be conducted for real-life applications and should account for dispersion stability and integrated absorption/regeneration processes. Moreover, optimum geometric conditions and gas-liquid contact modes need to be achieved in the reactor for real-life applications. Finally, this paper suggests future research directions for the absorption and regeneration of CO2 for industrial applications, including the scale-up method, numerical approach, and life cycle analysis.
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공과대학 (기계공학부)
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