Synergistic CO2 adsorption in MCM-41 via pore-confined choline chloride-urea deep eutectic solvent
MICROPOROUS AND MESOPOROUS MATERIALS, cilt.408, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 408
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.micromeso.2026.114145
- Dergi Adı: MICROPOROUS AND MESOPOROUS MATERIALS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Ondokuz Mayıs Üniversitesi Adresli: Evet
Özet
Solid sorbent-based post-combustion CO2 capture is increasingly recognized as a viable pathway toward energy-efficient decarbonization. In this study, a choline chloride-urea deep eutectic solvent (ChCl:U DES) is employed to tailor the surface chemistry of mesoporous MCM-41 via controlled impregnation, with the objective of enhancing CO2 affinity, adsorption kinetics, and cyclic stability. Structural and textural characterization using XRD, N2 physisorption, FTIR, SEM-EDX, and TGA confirms successful DES incorporation within the mesoporous framework while preserving the ordered hexagonal structure. Fixed-bed adsorption experiments conducted under flue-gas-relevant conditions (20-80 degrees C, 5-15 vol% CO2/N2) reveal a pronounced enhancement in performance, with the optimally impregnated ChCl@MCM-41 achieving a CO2 uptake of 4.95 mmol g-1 at 60 degrees C, substantially exceeding that of pristine MCM-41. Kinetic analysis indicates pseudo-second-order behavior governed primarily by intraparticle diffusion, while thermodynamic evaluation confirms a spontaneous and exothermic adsorption process. Importantly, DES impregnation markedly improves regenerability and thermal robustness, with more than 96% of the initial adsorption capacity retained after multiple cycles. Overall, this work demonstrates that deep eutectic solvent impregnation provides an effective and scalable route for engineering mesoporous adsorbents with enhanced performance for post-combustion CO2 capture.