TY - JOUR

T1 - CO2 sorption behavior of composite materials composed of amino acid ionic liquid and SiO2 or ZrO2-SiO2 aerogels

AU - Sheshkovas, Andrey Z.

AU - Veselovskaya, Janna V.

AU - Rogov, Vladimir A.

AU - Shalygin, Anton S.

AU - Vdovichenko, Vsevolod A.

AU - Deng, Shuai

AU - Kozlov, Denis V.

N1 - This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Boreskov Institute of Catalysis (project no. FWUR-2024–0036).

PY - 2026/2/20

Y1 - 2026/2/20

N2 - This study investigates the use of the composite sorbents based on mesoporous silica and zirconia-silica aerogels functionalized with an amino acid ionic liquid for CO2 capture from flue gases. The 1-ethyl-3-methylimidazolium glycinate ([Emim][Gly]) ionic liquid was supported on aerogels with varying Zr/Si ratios and porosities to evaluate the CO2 sorption performance of the resulting composite materials. The best-performing composite material containing 40 wt% [Emim][Gly] achieved a dynamic sorption capacity of 51.2 mg(CO2)/g, slightly exceeding the theoretical stoichiometric limit due to additional physical adsorption. The study provides fresh insights into the impact of support porosity on the sorption characteristics of composite materials. The porous structure of a support played a critical role, with moderate porosity (75–81 %) enabling optimal performance, while excessive porosity (≥87 %) led to pore collapse and reduced CO2 sorption efficiency. The heat capacity of [Emim][Gly] was measured for the first time using the differential scanning calorimetry method and found to be 1.8–2.0 J/(g·K) over the temperature range of 315–373 K. The data on the ionic liquid's heat capacity, as well as measured values of CO2 sorption capacity and enthalpy of CO2 sorption were used to estimate for the first time the thermal energy required for regenerating composite materials based on [Emim][Gly]. The best-performing composite material requires a low regeneration energy of 3.7 GJ/t(CO2), outperforming conventional amine-based solvents. The results obtained highlight the importance of tailored support design in the development of efficient, energy-saving materials for CO2 capture, with potential applications in industrial flue gas treatment.

AB - This study investigates the use of the composite sorbents based on mesoporous silica and zirconia-silica aerogels functionalized with an amino acid ionic liquid for CO2 capture from flue gases. The 1-ethyl-3-methylimidazolium glycinate ([Emim][Gly]) ionic liquid was supported on aerogels with varying Zr/Si ratios and porosities to evaluate the CO2 sorption performance of the resulting composite materials. The best-performing composite material containing 40 wt% [Emim][Gly] achieved a dynamic sorption capacity of 51.2 mg(CO2)/g, slightly exceeding the theoretical stoichiometric limit due to additional physical adsorption. The study provides fresh insights into the impact of support porosity on the sorption characteristics of composite materials. The porous structure of a support played a critical role, with moderate porosity (75–81 %) enabling optimal performance, while excessive porosity (≥87 %) led to pore collapse and reduced CO2 sorption efficiency. The heat capacity of [Emim][Gly] was measured for the first time using the differential scanning calorimetry method and found to be 1.8–2.0 J/(g·K) over the temperature range of 315–373 K. The data on the ionic liquid's heat capacity, as well as measured values of CO2 sorption capacity and enthalpy of CO2 sorption were used to estimate for the first time the thermal energy required for regenerating composite materials based on [Emim][Gly]. The best-performing composite material requires a low regeneration energy of 3.7 GJ/t(CO2), outperforming conventional amine-based solvents. The results obtained highlight the importance of tailored support design in the development of efficient, energy-saving materials for CO2 capture, with potential applications in industrial flue gas treatment.

KW - Aerogel

KW - Amino acid ionic liquid

KW - CO2 capture

KW - Composite sorbent

KW - Porosity

UR - https://www.scopus.com/pages/publications/105023134480

UR - https://www.mendeley.com/catalogue/6c50e396-2c42-3085-a630-8df86b0c768d/

U2 - 10.1016/j.colsurfa.2025.139060

DO - 10.1016/j.colsurfa.2025.139060

M3 - Article

VL - 731

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

SN - 0927-7757

M1 - 139060

ER -