Separating/capturing SF_(6),having the strongest global warming potential,from exhaust gas with low concentration(1%–10%)in the power industry is significant for both greenhouse gas emission control and SF_(6) recycl...Separating/capturing SF_(6),having the strongest global warming potential,from exhaust gas with low concentration(1%–10%)in the power industry is significant for both greenhouse gas emission control and SF_(6) recycling and reutilization.In this study,we achieved highly efficient SF_(6)/N_(2) separation under different SF_(6) concentrations(1% and 10%)using two homologous metal-organic frameworks,Ni-bpz and Zn-bpz.This outcome underscores the effectiveness of rational nano-traps distribution engineering for targeted separation applications.The molecular simulation suggests that an SF_(6) molecule interacts with a single nano-trap in Zn-bpz.At the same time,it is efficiently confined by two adjacent nano-traps in the parallel distribution of Ni-bpz.Consequently,exceptional SF_(6)/N_(2) selectivity for 1/99 and 10/90 mixtures have been respectively achieved in Ni-bpz(516,SF_(6)/N_(2)=1/99)and Zn-bpz(608,SF_(6)/N_(2)=10/90)at 298 K and 1 bar.In dynamic breakthrough experiments,Ni-bpz exhibits a record pure N_(2)(≥99.99%)productivity(1496 mL/g)for an SF_(6)/N_(2)(1/99)gas mixture.Moreover,both MOFs demonstrate excellent water resistance across multiple cycles,suggesting their high promise for practical application.展开更多
基金the financial support from the National Natural Science Foundation of China(Nos.22225803,22038001,22278011,and 22108007)the Beijing Natural Science Foundation(No.Z230023)the Beijing Nova Program(No.Z211100002121094).
文摘Separating/capturing SF_(6),having the strongest global warming potential,from exhaust gas with low concentration(1%–10%)in the power industry is significant for both greenhouse gas emission control and SF_(6) recycling and reutilization.In this study,we achieved highly efficient SF_(6)/N_(2) separation under different SF_(6) concentrations(1% and 10%)using two homologous metal-organic frameworks,Ni-bpz and Zn-bpz.This outcome underscores the effectiveness of rational nano-traps distribution engineering for targeted separation applications.The molecular simulation suggests that an SF_(6) molecule interacts with a single nano-trap in Zn-bpz.At the same time,it is efficiently confined by two adjacent nano-traps in the parallel distribution of Ni-bpz.Consequently,exceptional SF_(6)/N_(2) selectivity for 1/99 and 10/90 mixtures have been respectively achieved in Ni-bpz(516,SF_(6)/N_(2)=1/99)and Zn-bpz(608,SF_(6)/N_(2)=10/90)at 298 K and 1 bar.In dynamic breakthrough experiments,Ni-bpz exhibits a record pure N_(2)(≥99.99%)productivity(1496 mL/g)for an SF_(6)/N_(2)(1/99)gas mixture.Moreover,both MOFs demonstrate excellent water resistance across multiple cycles,suggesting their high promise for practical application.
