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Magnetic nanoparticle‐induced sorbent regeneration for direct air capture

Journal Article · · AIChE Journal
DOI:https://doi.org/10.1002/aic.18500· OSTI ID:2376370
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Tennessee Oak Ridge Innovation Institute, Oak Ridge, TN (United States)
+ Show Author Affiliations
Direct air capture (DAC) is a promising technology for decarbonization through the removal of CO2 from the atmosphere. In many DAC processes, the regeneration energy used to restore the capture capacity of sorbents accounts for a significant fraction of the energy required by the whole process. Here we report an effective and scalable sorbent regeneration method for liquid DAC solvents based on magnetic nanoparticles (MNPs) heating with AC magnetic fields. MNPs can be directly heated to provide uniform and rapid volumetric heating, as we demonstrate by promoting the release of captured CO2 from an aqueous solution of potassium sarcosinate. Our results showed that 90% of the solvent can be regenerated within 7.5 min of heating through proposed technique. The MNPs and solvent are found to be stable during the regeneration process and the MNPs showed long-term stability in the CO2-saturated solvent. Cyclic experiments showed that the nanoparticles can be reused for multiple cycles without performance deterioration. The process is operated in a noncontact mode through electromagnetic waves, making it an adoptable approach for existing carbon capture systems. The MNPs heating provides an effective regeneration strategy for liquid solvents used in carbon capture processes, in particular for DAC.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2376370
Journal Information:
AIChE Journal, Journal Name: AIChE Journal Journal Issue: 9 Vol. 70; ISSN 0001-1541
Publisher:
American Institute of Chemical EngineersCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (8)

Figure 1(p. 20)figure Figure 1
Figure 2(p. 21)figure Figure 2
Figure 3(p. 22)figure Figure 3
Figure 4(p. 23)figure Figure 4
Figure 5(p. 24)figure Figure 5
Figure 6(p. 25)figure Figure 6
Table 1(p. 26)table Table 1
Table 2(p. 27)table Table 2

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AC field
direct air capture
magnetic heating
magnetic nanoparticles
solvent regeneration