期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108580
关键词
Fluorinated compounds; Refrigerants; Porous solid materials; Solubilization; Separation
资金
- FCT/MCTES (Portugal) [UIDB/50006/2020, UIDP/50006/2020, 2020.00835.CEECIND, 2021.01432.CEECIND]
- Norma Transitoria Program [DL 57/2016]
- [PTDC/EQU-EQU/29737/2017]
The Kigali Amendment restricts the global use of F-gases and promotes the development of new refrigerants with lower global warming potential. This study investigates the potential of ionic liquids supported on silica as selective sorbents for F-gases, demonstrating the ability to finely tune selectivity.
The Kigali Amendment to the Montreal Protocol limits the global use of fluorinated greenhouse gases (F-gases) and encourages the development of a new generation of refrigerants with lower global warming potential. Therefore, there is a need to develop efficient and sustainable technologies to selectively capture and recycle the F-gases as new environmentally sustainable refrigerants. Here, ionic liquids (ILs) with high F-gas uptake capacity and selectivity were supported on silica and their potential as media for selective F-gas sorption was studied. For this purpose single-component sorption equilibria of difluoromethane (R-32), pentafluoroethane (R-125), and 1,1,1,2-tetrafluoroethane (R-134a) were measured at 303.15 K by gravimetry. The sorption data were success-fully correlated using classical models of sorption thermodynamics. The results show that the IL supported in the porous volume and on the external surface of the porous silica controls the F-gas uptake in the composites and that changing the IL's cations and anions allows fine-tuning the selectivity of the sorption process. This work brings crucial knowledge for the development of new materials based on ILs for the selective sorption of F-gases.
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