TY - JOUR
T1 - Exploring the potential of biomass-derived carbons for the separation of fluorinated gases with high global warming potential
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/6817 - DCRRNI ID/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/OE/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 single-component adsorption isotherms of R-32, R-125, R-134a, SF6 and N2 on the four biomass-derived porous carbons were measured by gravimetry in an ISOSORP high-pressure magnetic-suspension balance (MSB, Rubotherm GmbH, Germany). Approximately 0.30\u20130.40 g of the solid porous materials were loaded into the adsorption cells and then degasified at 373.15 K for 9 h under vacuum. After degassing, the sample was put into contact with the gas at a given pressure and temperature until the recorded mass stabilized. An adsorption point is under thermodynamic equilibrium when there are no discernible changes in weight, pressure, and temperature. This process is repeated continuously until the maximum pressure is reached. Finally, depressurization is performed to measure desorption points and check that the desorption branch of the isotherm coincides with the adsorption branch. The process is completed when the difference between the initial weight and the weight of the material after degassing is equal to zero. The adsorption equilibrium data are reported as excess adsorption, qex [28,30]; the corresponding values of total adsorption, q, determined from the experimental are reported in Tables S1\u2013S3 in the Supporting Information, SI. Finally, the adsorption-desorption equilibrium data were fitted using the isothermal dual-site Langmuir (DSL) model [ 54\u201356]. The parameters of the DSL model are shown in Tables S4 and S5 of SI.The authors acknowledge the financial support from the European Union's Horizon Europe research and innovation programme under grant agreement No 101082048\u2013- the MAR2PROTECT project. This work was also financed by national funds from FCT/MCTES (Portugal) through CEECIND/004431/2022 (I.M.), and the Norma Transitória DL 57/2016 Program Contract (R.P.P.L.R. and M.B.).
Publisher Copyright:
© 2024 The Authors
PY - 2024/9
Y1 - 2024/9
N2 - The development of advanced and innovative biomaterials with porous structural characteristics for the capture of fluorinated gases (F-gases) is important to contribute to the reduction of emissions of these gases with very high global warming potential. In this work, four biocarbons (CC-1:3H3PO4, CC-1:1H3PO4, CC-K2CO3 and CC-CO2) were produced by chemical and physical activation of corn cob biomass (CC). The adsorption equilibria of difluoromethane (R-32), pentafluoroethane (R-125), 1,1,1-tetrafluoroethane (R-125), 1,1,2-tetrafluoroethane (R-134a), sulphur hexafluoride (SF6), and nitrogen (N2) on these biocarbons were determined at 303.15 K. The highest adsorption capacities were obtained for CC-K2CO3 and CC-CO2 and a full characterization was also performed for these biomaterials at 283.15 and 323.15 K. On the other hand, the selectivities of SF6/N2 and the commercial refrigerants R-410A, R-407C, and R-407F were estimated using the Ideal Adsorption Solution theory (IAST). The results obtained for SF6/N2 show that the biocarbon CC-K2CO3 stands out from the other materials. In addition, the CC-CO2 shows a preference for R-32 over R-125 for the separation of the R-410A. Finally, CC-K2CO3 has a greater preference for R-134a over R-32 and R-125 in the R-407C and R-407F blends. Overall, these novel biocarbons improve the separation and purification of the F-gases under study, facilitating their application on a pilot scale.
AB - The development of advanced and innovative biomaterials with porous structural characteristics for the capture of fluorinated gases (F-gases) is important to contribute to the reduction of emissions of these gases with very high global warming potential. In this work, four biocarbons (CC-1:3H3PO4, CC-1:1H3PO4, CC-K2CO3 and CC-CO2) were produced by chemical and physical activation of corn cob biomass (CC). The adsorption equilibria of difluoromethane (R-32), pentafluoroethane (R-125), 1,1,1-tetrafluoroethane (R-125), 1,1,2-tetrafluoroethane (R-134a), sulphur hexafluoride (SF6), and nitrogen (N2) on these biocarbons were determined at 303.15 K. The highest adsorption capacities were obtained for CC-K2CO3 and CC-CO2 and a full characterization was also performed for these biomaterials at 283.15 and 323.15 K. On the other hand, the selectivities of SF6/N2 and the commercial refrigerants R-410A, R-407C, and R-407F were estimated using the Ideal Adsorption Solution theory (IAST). The results obtained for SF6/N2 show that the biocarbon CC-K2CO3 stands out from the other materials. In addition, the CC-CO2 shows a preference for R-32 over R-125 for the separation of the R-410A. Finally, CC-K2CO3 has a greater preference for R-134a over R-32 and R-125 in the R-407C and R-407F blends. Overall, these novel biocarbons improve the separation and purification of the F-gases under study, facilitating their application on a pilot scale.
KW - F-gases
KW - Gas separation
KW - HFCs
KW - Porous materials
KW - Refrigerants
UR - http://www.scopus.com/inward/record.url?scp=85199893695&partnerID=8YFLogxK
U2 - 10.1016/j.biombioe.2024.107323
DO - 10.1016/j.biombioe.2024.107323
M3 - Article
AN - SCOPUS:85199893695
SN - 0961-9534
VL - 188
JO - Biomass and Bioenergy
JF - Biomass and Bioenergy
M1 - 107323
ER -
