TY - JOUR
T1 - Review of nanoabsorbents for capture enhancement of CO2 and its industrial applications with design criteria
AU - Lee, Jae Won
AU - Kim, Seonggon
AU - Torres Pineda, Israel
AU - Kang, Yong Tae
N1 - Funding Information:
This work was supported by the National Research Foundation ( NRF ) of Korea, grant funded by the Korea government ( MSIP ) (grant numbers: 2019R1A2B5B03069991 and 2020R1A5A1018153 ).
Publisher Copyright:
© 2020 The Authors
PY - 2021/3
Y1 - 2021/3
N2 - 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.
AB - 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.
KW - CO absorption
KW - CO capture
KW - CO regeneration
KW - Mass-transfer enhancement
KW - Nanoabsorbents
KW - Nanomaterials
UR - http://www.scopus.com/inward/record.url?scp=85096193943&partnerID=8YFLogxK
U2 - 10.1016/j.rser.2020.110524
DO - 10.1016/j.rser.2020.110524
M3 - Review article
AN - SCOPUS:85096193943
SN - 1364-0321
VL - 138
JO - Renewable and Sustainable Energy Reviews
JF - Renewable and Sustainable Energy Reviews
M1 - 110524
ER -