CO2 capture using silica-immobilized dicationic ionic liquids with magnetic and non-magnetic properties

• Autor(a) principal: Duarte, Evandro Augusto do Canto
• Data de Publicação: 2024
• Outros Autores: Bernard, Franciele Longaray, Santos, Leonardo Moreira dos, Polesso, Bárbara Burlini, Duczinski, Rafael Borges, Forneck, Vítor Cattani, Geshev, Julian Penkov, Einloft, Sandra Mara Oliveira
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/280220
• topic: Líquidos iônicos; Sílica; Materiais mesoporosos; Dióxido de carbono; CO2 capture; Mesoporous silica supports; Dicationic ionic liquid; Magnetic dicationic ionic liquids

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.