TY - JOUR
T1 - Coconut shell derived activated carbon for effective separation of greenhouse gases
AU - Sosa, Julio E.
AU - Ribeiro, Rui P. P. L.
AU - Matos, Inês
AU - Bernardo, Maria
AU - Fonseca, Isabel M.
AU - Mota, José P. B.
AU - Araújo, João M. M.
AU - Pereiro, Ana B.
N1 - info:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Base/UIDB%2F50006%2F2020/PT#
info:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Programático/UIDP%2F50006%2F2020/PT#
info:eu-repo/grantAgreement/FCT//2022.11909.BD/PT#
info:eu-repo/grantAgreement/FCT/CEEC IND 3ed/2020.00835.CEECIND%2FCP1586%2FCT0014/PT#
info:eu-repo/grantAgreement/FCT/CEEC IND4ed/2021.01432.CEECIND%2FCP1657%2FCT0044/PT#
Funding Information:
The authors acknowledge the financial support from the European Union’s Horizon Europe research and innovation programme under grant agreement No 101082048 – the MAR2PROTECT project. This work was also financed by national funds from FCT/MCTES (Portugal) through Associate Laboratory for Green Chemistry–LAQV (UIDB/50006/2020 | UIDP/50006/2020), grant 2022.11909.BD (J.E.S), the contracts of Individual Call to Scientific Employment Stimulus 2020.00835.CEECIND (J.M.M.A.) / 2021.01432.CEECIND (A.B.P.) / CEECIND/004431/2022 (I.M.), and the Norma Transitória DL 57/2016 Program Contract (R.P.P.L.R. and M.B.).
Publisher Copyright:
© 2025
PY - 2025/8
Y1 - 2025/8
N2 - The development of efficient adsorbent materials for the selective capture of greenhouse gases (GHGs) is crucial. The porosity and surface area of the materials are key factors for the GHGs separation. This study demonstrates how waste from coconut shell (CS) biomass can be used to design novel biomaterials (CS-CO2, CS-ZnCl2) with enhanced GHG selectivity. A comparison with activated carbon monoliths (ACM) and a metal-organic framework (Fe-BTC) was carried out to assess the impact of different porous matrices on GHGs capture. The adsorption equilibrium of R-32, R-125, R-134a, R-143a, CO2, and CH4 on these materials was measured between 283.15–323.15 K. The adsorption isotherms obtained were fitted using the dual-site Langmuir model. For R-32, R-125, R-134a and R-143a, the adsorption capacity follows ACM > CS-ZnCl2 > Fe-BTC > CS-CO2 due to the decrease of the surface area. The CO2 adsorption capacity is ACM > Fe-BTC > CS-ZnCl2 > CS-CO2, which is related to the micropore volume. In this case, CS-CO2 has a smaller adsorption capacity but is similar to ACM and outperforms Fe-BTC at P < 0.4 MPa. The selectivity of R-410A, R-407C, R-404A, and CO2/CH4 blends was determined with the Ideal Adsorbed Solution Theory (IAST). CS-ZnCl2 shows a higher selectivity for R-125 over R-32 in R-410A and R-407C separations due to its larger pore volume. CS-CO2 predominantly adsorbs R-134a and R-143a over R-125 in R-404A separation. ACM preferentially adsorbs CO2 over CH4 due to its large, elongated micropores. This study introduces innovative materials that improve GHGs separation and help reduce emissions.
AB - The development of efficient adsorbent materials for the selective capture of greenhouse gases (GHGs) is crucial. The porosity and surface area of the materials are key factors for the GHGs separation. This study demonstrates how waste from coconut shell (CS) biomass can be used to design novel biomaterials (CS-CO2, CS-ZnCl2) with enhanced GHG selectivity. A comparison with activated carbon monoliths (ACM) and a metal-organic framework (Fe-BTC) was carried out to assess the impact of different porous matrices on GHGs capture. The adsorption equilibrium of R-32, R-125, R-134a, R-143a, CO2, and CH4 on these materials was measured between 283.15–323.15 K. The adsorption isotherms obtained were fitted using the dual-site Langmuir model. For R-32, R-125, R-134a and R-143a, the adsorption capacity follows ACM > CS-ZnCl2 > Fe-BTC > CS-CO2 due to the decrease of the surface area. The CO2 adsorption capacity is ACM > Fe-BTC > CS-ZnCl2 > CS-CO2, which is related to the micropore volume. In this case, CS-CO2 has a smaller adsorption capacity but is similar to ACM and outperforms Fe-BTC at P < 0.4 MPa. The selectivity of R-410A, R-407C, R-404A, and CO2/CH4 blends was determined with the Ideal Adsorbed Solution Theory (IAST). CS-ZnCl2 shows a higher selectivity for R-125 over R-32 in R-410A and R-407C separations due to its larger pore volume. CS-CO2 predominantly adsorbs R-134a and R-143a over R-125 in R-404A separation. ACM preferentially adsorbs CO2 over CH4 due to its large, elongated micropores. This study introduces innovative materials that improve GHGs separation and help reduce emissions.
KW - Adsorption
KW - F-gases
KW - Gas separation
KW - GHGs
KW - Porous materials
KW - Refrigerants
UR - http://www.scopus.com/inward/record.url?scp=105004030647&partnerID=8YFLogxK
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001486465000001
U2 - 10.1016/j.ijrefrig.2025.04.022
DO - 10.1016/j.ijrefrig.2025.04.022
M3 - Article
AN - SCOPUS:105004030647
SN - 0140-7007
VL - 176
SP - 66
EP - 78
JO - International Journal of Refrigeration
JF - International Journal of Refrigeration
ER -