Design of an Activated Carbon bed for CO₂ fertilization in greenhouses using adsorption isotherms and thermodynamics
Applied Thermal Engineering, cilt.288, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 288
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.applthermaleng.2025.129586
- Dergi Adı: Applied Thermal Engineering
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC, DIALNET
- Anahtar Kelimeler: Activated carbon, Adsorption isotherms, Adsorption thermodynamics, CO2 fertilization, CO2 storage
- Süleyman Demirel Üniversitesi Adresli: Evet
Özet
The rising demand for food has increased the construction of modern greenhouses, where CO₂ fertilization is employed to improve crop quality. However, in such systems the daytime operation of natural gas heating for flue gas injection is energy-inefficient, as heating is usually unnecessary during the day. The present study emphasized a system operating with the Pressure Swing Adsorption (PSA) method, which involves the storage of CO2 in flue gas in activated carbon. The amount of activated carbon required for the system was determined by using adsorption isotherms and thermodynamics. An experimental set was established for measuring adsorption isotherms. Adsorption isotherms were measured at temperatures ranging from 298 to 328 K and at pressures ranging from 1 to 4 bar. The experimental adsorption isotherms were modelled with the Langmuir and Dubinin-Astakhov models. Key thermodynamic adsorption parameters were calculated including the isosteric heat of adsorption, Gibbs free energy and adsorption entropy. Thermodynamic parameters revealed that the adsorption was exothermic, non-spontaneous and physical in nature. Subsequently, the amount of activated carbon required for unit area of the greenhouse was calculated. The study demonstrated that the effect of adiabatic heating on the amount of activated carbon was significant. It is asserted that the adsorption isotherms and thermodynamics calculated in this study have significant utility in the design of adsorption-based gas storage systems.