Adsorptive separation of SF6/N2 mixtures is an important issue since SF6 is a significant greenhouse gas. Although separation performances should be evaluated under high pressure conditions to find an efficient adsorbent candidate for pressure swing adsorption (PSA) processes, no studies on metal–organic frameworks (MOFs) have focused on SF6/N2 separation at high pressures above 1 bar. In this study, we evaluated the potential of three hydrothermally stable adsorbents, including two MOFs (UiO-66 and UiO-67) and zeolite-13X, for SF6/N2 separation under normal PSA operation pressures (∼10 bar). Interestingly, UiO-67 with a high surface area and large pore size exhibited very high SF6/N2 selectivity (30∼37) at 10 bar as well as a significantly large SF6 working capacity (5.94 mmol g−1) between 10 bar and 1 bar. Moreover, UiO-67 showed facile regeneration at the ambient temperature as well as good cyclic adsorption and desorption behavior during 20 cycles. These results show that UiO-67 is a potential adsorbent for adsorptive SF6/N2 separation.
Bibliographical noteFunding Information:
This research was supported by Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry and Energy , Republic of Korea (No. 20174010201640 ). Additionally, we would like to acknowledge the “Next Generation Carbon Upcycling Project” (Project No. 2017M1A2A2043449) through the National Research Foundation (NRF) funded by the Ministry of Science and ICT , Republic of Korea. This work was also supported by the Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2018 (project no.: 2018-12-0147). Appendix A
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)