To obtain materials capable of efficiently separating acetylene(C_(2)H_(2))from carbon dioxide(CO_(2))and eth-ylene(C_(2)H_(4)),In this work,based on the pore space partition strategy,a pacs-metal-organic framework(MO...To obtain materials capable of efficiently separating acetylene(C_(2)H_(2))from carbon dioxide(CO_(2))and eth-ylene(C_(2)H_(4)),In this work,based on the pore space partition strategy,a pacs-metal-organic framework(MOF):(NH_(2)Me_(2))_(2)[Fe_(3)(μ_(3)-O)(bdc)_(3)][In(FA)_(3)Cl_(3)](Fe‑FAIn‑bdc)was synthesized successfully by using the metal-formate com-plex[In(FA)_(3)Cl_(3)]^(3-)as the pore partition units,where bdc^(2-)=terephthalate,FA-=formate.Owing to the pore partition effect of this metal-organic building block,fruitful confined spaces are formed in the network of Fe‑FAIn‑bdc,endowing this MOF with superior separation performance of acetylene and carbon dioxide.According to the adsorp-tion test,this MOF exhibited a high adsorption capacity for C_(2)H_(2)(50.79 cm^(3)·g^(-1))at 298 K and 100 kPa,which was much higher than that for CO_(2)(29.99 cm^(3)·g^(-1))and C_(2)H_(4)(30.94 cm^(3)·g^(-1))under the same conditions.Ideal adsorbed solution theory(IAST)calculations demonstrate that the adsorption selectivity of Fe‑FAIn‑bdc for the mixture of C_(2)H_(2)/CO_(2)and C_(2)H_(2)/C_(2)H_(4)in a volume ratio of 50∶50 was 3.08 and 3.65,respectively,which was higher than some reported MOFs such as NUM-11 and SNNU-18.CCDC:_(2)453954.展开更多
Perfluoroalkyl acids of different chain lengths,including trifluoroacetic acid,heptafluorobutyric acid,and nonafluoropentanoic acid,were used as second ligands to replace the formic acid on the Zr_(6)clusters in MOF-8...Perfluoroalkyl acids of different chain lengths,including trifluoroacetic acid,heptafluorobutyric acid,and nonafluoropentanoic acid,were used as second ligands to replace the formic acid on the Zr_(6)clusters in MOF-808.This led to the formation of a series of MOF-808-R materials(R=F_(3),F_(7),F_(9),corresponding to trifluoroacetic acid,hep-tafluorobutyric acid,and nonafluoropentanoic acid)with multiple ligands,and we investigated the impact of the sec-ond ligand modification on pore size and pore environment.The loading amount of the second ligand was deter-mined using NMR and other methods.We conducted adsorption tests for acetylene and carbon dioxide at different temperatures on both MOF-808 and MOF-808-R to explore the effects of the ligand diversification on acetylene sep-aration performance.It was found that MOF-808-F_(7)exhibited the best performance in acetylene-carbon dioxide sep-aration.展开更多
文摘To obtain materials capable of efficiently separating acetylene(C_(2)H_(2))from carbon dioxide(CO_(2))and eth-ylene(C_(2)H_(4)),In this work,based on the pore space partition strategy,a pacs-metal-organic framework(MOF):(NH_(2)Me_(2))_(2)[Fe_(3)(μ_(3)-O)(bdc)_(3)][In(FA)_(3)Cl_(3)](Fe‑FAIn‑bdc)was synthesized successfully by using the metal-formate com-plex[In(FA)_(3)Cl_(3)]^(3-)as the pore partition units,where bdc^(2-)=terephthalate,FA-=formate.Owing to the pore partition effect of this metal-organic building block,fruitful confined spaces are formed in the network of Fe‑FAIn‑bdc,endowing this MOF with superior separation performance of acetylene and carbon dioxide.According to the adsorp-tion test,this MOF exhibited a high adsorption capacity for C_(2)H_(2)(50.79 cm^(3)·g^(-1))at 298 K and 100 kPa,which was much higher than that for CO_(2)(29.99 cm^(3)·g^(-1))and C_(2)H_(4)(30.94 cm^(3)·g^(-1))under the same conditions.Ideal adsorbed solution theory(IAST)calculations demonstrate that the adsorption selectivity of Fe‑FAIn‑bdc for the mixture of C_(2)H_(2)/CO_(2)and C_(2)H_(2)/C_(2)H_(4)in a volume ratio of 50∶50 was 3.08 and 3.65,respectively,which was higher than some reported MOFs such as NUM-11 and SNNU-18.CCDC:_(2)453954.
文摘Perfluoroalkyl acids of different chain lengths,including trifluoroacetic acid,heptafluorobutyric acid,and nonafluoropentanoic acid,were used as second ligands to replace the formic acid on the Zr_(6)clusters in MOF-808.This led to the formation of a series of MOF-808-R materials(R=F_(3),F_(7),F_(9),corresponding to trifluoroacetic acid,hep-tafluorobutyric acid,and nonafluoropentanoic acid)with multiple ligands,and we investigated the impact of the sec-ond ligand modification on pore size and pore environment.The loading amount of the second ligand was deter-mined using NMR and other methods.We conducted adsorption tests for acetylene and carbon dioxide at different temperatures on both MOF-808 and MOF-808-R to explore the effects of the ligand diversification on acetylene sep-aration performance.It was found that MOF-808-F_(7)exhibited the best performance in acetylene-carbon dioxide sep-aration.
