Dynamic fixed-bed evaluation of Zeolite 13X for CO₂ capture: Kinetics, isotherm modelling, and TSA/VSA performance
Separation Science and Technology (Philadelphia), 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1080/01496395.2026.2711678
- Dergi Adı: Separation Science and Technology (Philadelphia)
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Compendex, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: adsorption kinetics, Dubinin–Radushkevich isotherm, fixed-bed adsorption, temperature swing adsorption (TSA), Zeolite 13X
- Ondokuz Mayıs Üniversitesi Adresli: Evet
Özet
Commercial zeolite 13X remains one of the most practical adsorbents for post-combustion CO2 capture, yet its dynamic fixed-bed performance must be evaluated under process-relevant flow conditions rather than by equilibrium capacity alone. In this work, CO2 breakthrough experiments were conducted at 25°C using CO2/N2 mixtures containing 5–20 vol.% CO2 and different adsorbent dosages. At 25°C and 15% CO2, zeolite 13X achieved a dynamic adsorption capacity of 1.781 mmol g−1, while the maximum uptake reached 3.723 mmol g−1 at 0.5 g adsorbent dosage under the selected fixed-bed conditions. Kinetic analysis showed that the pseudo-second-order model provided the best overall fit; however, this behavior was interpreted as a lumped kinetic response associated with surface accessibility, micropore filling, and diffusion-influenced physisorption rather than chemisorption. The Weber–Morris model further confirmed a multi-stage uptake pathway involving rapid external adsorption, intraparticle diffusion, and final saturation. Isotherm analysis supported micropore-filling physisorption as the dominant adsorption mechanism. FESEM–EDX, XRD, FTIR, and TGA analyses confirmed that zeolite 13X retained its morphology, crystallinity, and framework stability after CO2 adsorption. Cyclic adsorption–desorption tests showed good regenerability, with only a 4.32% capacity decline over 12 cycles. Simplified TSA and VSA process calculations gave working capacities of 2.85 and 2.21 mmol g−1, respectively. Overall, this study provides a process-oriented assessment of commercial zeolite 13X as a robust, regenerable, and industrially relevant adsorbent for cyclic CO2 capture.