Kinetic model for moisture-controlled CO<sub>2</sub> sorption

Kaneko, Yuta; Lackner, Klaus S.

doi:10.1039/d2cp02440c

Cited by 8 publications

(6 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The energy cost of moisture-swing carbon capture has been reported as 50 kJ/mol . As a result, in the past decade, there has been growing interest in the use of ion-exchange resins (IERs) for moisture-swing carbon capture: materials that capture CO 2 under dry conditions and release it under humid conditions. , There have also been recent advances on a conceptually different but related, continuous, moisture-gradient-assisted capture process. , These systems consume minimal energypotentially even relying on natural humidity gradientsand exhibit rapid kinetics as well as reliable, cyclic performance at ambient CO 2 levels …”

Section: Introductionmentioning

confidence: 99%

Expanding the Library of Ions for Moisture-Swing Carbon Capture

Hegarty,

Shindel,

Sukhareva

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Developing materials that can more efficiently and cheaply capture carbon dioxide from ambient atmospheric conditions is essential for improving negative emission technologies. This study builds on the promising moisture-swing modality for direct air capture of carbon dioxide by investigating the use of several new anions�orthosilicate, borate, pyrophosphate, tripolyphosphate, and dibasic phosphate�that when introduced into ionexchange resins allow for the cyclable capture of CO 2 under dry conditions and its release under wet conditions. These ions, as well as many others that failed to show moisture-swing performance, are tested and directly compared thermodynamically and kinetically to understand their differences. This includes the use of analytical approaches new to the carbon capture field, such as the correlation of adsorption isotherms to moisture-swing performance, the use of phase lag kinetics, the examination of the humidity-carbon capture hysteresis of the sorbents, and the precise quantification of ion loading using inductively coupled plasma−optical emission spectroscopy. Phosphate dibasic was found to have the largest mass-normalized CO 2 moisture-swing capacity, whereas phosphate tribasic had the best performance when factoring in kinetics, and pyrophosphate had the highest swing capacity when normalizing on a per-ion or per-unit-charge basis. This work not only sheds light on ways to improve DAC but also provides insights pertinent to the advancement of gas separation, negative emission technologies, and sorbent materials.

show abstract

Section: Introductionmentioning

confidence: 99%

Expanding the Library of Ions for Moisture-Swing Carbon Capture

Hegarty,

Shindel,

Sukhareva

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The chemical reaction of CO 2 with primary amines (RNH 2 ) comprises two sequential elementary reactions. 5,16 The first step leads to the formation of carbamic acids (RNHCOOH) as:…”

Section: Co 2 Capture By Primary Secondary and Tertiary Aminesmentioning

confidence: 99%

“…In the 2000s, it was experimentally observed that the CO 2 affinity of a strong-base anion exchange resin is affected by humidity levels, which points to the presence of moisture-swing or moisture-controlled CO 2 sorption. [13][14][15][16] In this system, CO 2 is sorbed when the sorbent is dry, and CO 2 is desorbed when the sorbent is wet. [17][18][19] Interestingly, such a negative correlation between water and CO 2 sorption in quaternary ammonium is opposite to co-absorption observed in primary amines or secondary amines.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous paper, we demonstrated that the CO 2 isotherm equation of a strong-base AEM can be derived by extending the theory of strong-base aqueous alkaline solutions. 20,21 The resulting isotherm equation explicitly includes the water concentration term and thus can quantitatively account for the influence of water. The model predicts that increasing the humidity of the surrounding gas results in the deviation from the Langmuir isotherm, which has been validated using literature data.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A general binary isotherm model for amines interacting with CO₂ and H₂O

Kaneko

Lackner

2023

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…DAC researchers have studied the applicability of a variety of materials with quaternary ammonium groups for the moisture swing sorption process. However, comprehensive investigations are still required to better understand the mechanism, develop faster kinetics, increase the loading capacity, and enhance the selectivity for CO 2 . Porous polymers, ammonium-based anion exchange resins, ammonium-functionalized ionic liquids, cellulose and chitosan/PVA aerogels, ammonium-modified silica, colloidal crystal templates, and sorbent-containing electrospun fibers have been evaluated as sorbents. ,− He and co-workers tested three QA-functionalized porous materials and reported CO 2 uptake between 0.13 and 0.49 mmol/g when cycling the relative humidity between 20 and 95% .…”

Section: Introductionmentioning

confidence: 99%