A microporous calcium-based MOF for separation of CH4 from C-2 hydrocarbons and CO2

A hms-type microporous metal-organic framework, {[Ca-3(NTB)(2)(H2O)(2)]center dot NMF center dot 4NMP center dot 4H(2)O}(n) (Ca-MOF, H3NTB = 4,4',4 ''-nitrilotrisbenzoic acid, NMF = N-methyl formamide, NMP = N-methyl-2-pyrrolidone), was solvothermal synthesized. Desolvated Ca-MOF shows relatively high C-2 hydrocarbons and CO2 storage capacity at 298 K and 1 atm (C2H2: 107.0 cm(3) g(-1), C2H4: 79.0 cm(3) g(-1) C2H6: 99.2 cm(3) g(-1), CO2: 65.9 cm(3) g(-1)), and a lower CH4 adsorption uptake (14.6 cm(3) g(-1)). Its ideal adsorbed solution theory (IAST)-predicted selectivities of C-2 hydrocarbons and CO2 over CH4 range from 5.7 to 10.0 at room temperature, indicating its potential for separation of C-2 hydrocarbons and CO2 from CH4.

Automated summary

The HMS-type microporous metal-organic framework shows high C-2 hydrocarbons and CO2 storage capacity, with potential for the separation of C-2 hydrocarbons and CO2 from CH4.