CO2 capture using silica-immobilized dicationic ionic liquids with magnetic and non-magnetic properties
Evandro Duarte,
Franciele Bernard,
Leonardo Moreira Dos Santos,
Barbara B. Polesso,
Rafael Duczinski,
Vitor Forneck,
Julian Geshev,
Sandra Einloft
Affiliations
Evandro Duarte
Post-Graduation Program in Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil; School of Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil
Franciele Bernard
School of Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil
Leonardo Moreira Dos Santos
School of Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil
Barbara B. Polesso
Post-Graduation Program in Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil; School of Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil
Rafael Duczinski
Post-Graduation Program in Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil; School of Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil
Vitor Forneck
School of Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil
Julian Geshev
Institute of Physics, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
Sandra Einloft
Post-Graduation Program in Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil; School of Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil; Corresponding author. Post-Graduation Program in Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul – PUC, RS, Brazil.
The need to find alternative materials to replace aqueous amine solutions for the capture of CO2 in post-combustion technologies is pressing. This study assesses the CO2 sorption capacity and CO2/N2 selectivity of three dicationic ionic liquids with distinct anions immobilized in commercial mesoporous silica support (SBA- 15). The samples were characterized by UART-FTIR, NMR, Raman, FESEM, TEM, TGA, Magnetometry (VSM), BET and BJH. The highest CO2 sorption capacity and CO2/N2 selectivity were obtained for sample SBA@DIL_2FeCl4 [at 1 bar and 25 °C; 57.31 (±0.02) mg CO2/g; 12.27 (±0.72) mg CO2/g]. The results were compared to pristine SBA-15 and revealed a similar sorption capacity, indicating that the IL has no impact on the CO2 sorption capacity of silica. On the other hand, selectivity was improved by approximately 3.8 times, demonstrating the affinity of the ionic liquid for the CO2 molecule. The material underwent multiple sorption/desorption cycles and proved to be stable and a promising option for use in industrial CO2 capture processes.
