TY - JOUR

T1 - K2CO3-containing composite sorbents based on a ZrO2 aerogel for reversible CO2 capture from ambient air

AU - Veselovskaya, Janna V.

AU - Derevschikov, Vladimir S.

AU - Shalygin, Anton S.

AU - Yatsenko, Dmitry A.

N1 - This work was supported by Russian Science Foundation (project no 19-73-00079). The authors also thank Solovyeva M.V., Dr. Gerasimov E. Yu., and Suprun E.A. for performing N2 adsorption, HRTEM, and SEM measurements, correspondingly. K2CO3-containing composite sorbents based on a ZrO2 aerogel for reversible CO2 capture from ambient air / J. V. Veselovskaya, V. S. Derevschikov, A. S. Shalygin, D. A. Yatsenko // Microporous and Mesoporous Materials. – 2021. – Vol. 310. – P. 110624.

PY - 2021/1

Y1 - 2021/1

N2 - In this work, K2CO3-containing composite materials were synthesized based on a mesoporous zirconia aerogel prepared by an epoxide-assisted sol-gel method using supercritical drying in ethanol. The porous ZrO2 was impregnated with an aqueous solution of potassium carbonate to obtain composite materials with K2CO3 weight content ranging from 9 to 29 wt%. All the composites were tested in the process of CO2 absorption from the air with a relative humidity of 25% followed by thermal desorption at 200 °C. The samples after the CO2 absorption step were characterized by Fourier transform infrared spectroscopy and X-ray diffraction methods. Among the materials studied, the composite sorbent containing 23 wt% K2CO3 demonstrated the highest dynamic CO2 absorption capacity (4.6 wt%) in the temperature-swing absorption (TSA) cycles. The results indicate that a certain part of K2CO3 loaded into zirconia mesopores forms surface species which do not actively participate in the CO2 absorption and desorption processes. For the composite K2CO3/ZrO2 material with the optimal K2CO3 loading, CO2 absorption capacity is higher compared to the values obtained for K2CO3/γ-Al2O3 composite sorbents studied under the same conditions. Taking into account that this material demonstrates stable CO2 absorption capacity values in the consecutive TSA cycles and needs a relatively low temperature for regeneration, it should be considered for application in Direct Air Capture units.

AB - In this work, K2CO3-containing composite materials were synthesized based on a mesoporous zirconia aerogel prepared by an epoxide-assisted sol-gel method using supercritical drying in ethanol. The porous ZrO2 was impregnated with an aqueous solution of potassium carbonate to obtain composite materials with K2CO3 weight content ranging from 9 to 29 wt%. All the composites were tested in the process of CO2 absorption from the air with a relative humidity of 25% followed by thermal desorption at 200 °C. The samples after the CO2 absorption step were characterized by Fourier transform infrared spectroscopy and X-ray diffraction methods. Among the materials studied, the composite sorbent containing 23 wt% K2CO3 demonstrated the highest dynamic CO2 absorption capacity (4.6 wt%) in the temperature-swing absorption (TSA) cycles. The results indicate that a certain part of K2CO3 loaded into zirconia mesopores forms surface species which do not actively participate in the CO2 absorption and desorption processes. For the composite K2CO3/ZrO2 material with the optimal K2CO3 loading, CO2 absorption capacity is higher compared to the values obtained for K2CO3/γ-Al2O3 composite sorbents studied under the same conditions. Taking into account that this material demonstrates stable CO2 absorption capacity values in the consecutive TSA cycles and needs a relatively low temperature for regeneration, it should be considered for application in Direct Air Capture units.

KW - Aerogel

KW - Carbon dioxide

KW - Direct air capture

KW - Potassium carbonate

KW - Zirconia

KW - ZIRCONIA AEROGEL

KW - ADSORBENTS

KW - REGENERATION

KW - FIXED-BED

KW - ADSORPTION

KW - SURFACE CHARACTERIZATION

KW - DEGRADATION

KW - K2CO3/AL2O3

KW - ABSORPTION

KW - CARBON-DIOXIDE

UR - http://www.scopus.com/inward/record.url?scp=85091348158&partnerID=8YFLogxK

UR - https://www.elibrary.ru/item.asp?id=45270537

U2 - 10.1016/j.micromeso.2020.110624

DO - 10.1016/j.micromeso.2020.110624

M3 - Article

AN - SCOPUS:85091348158

VL - 310

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

SN - 1387-1811

M1 - 110624

ER -