JIA Xiaoxia, WANG Li, YUAN Ning, et al. CH4/N2 adsorption separation research of MOFs with divalent Cr/Mo/Ni unsaturated metal sites[J]. CIESC Journal, 2018, (9): 3896-3904. DOI: 10.11949/j.issn.0438-1157.20180302.
JIA Xiaoxia, WANG Li, YUAN Ning, et al. CH4/N2 adsorption separation research of MOFs with divalent Cr/Mo/Ni unsaturated metal sites[J]. CIESC Journal, 2018, (9): 3896-3904. DOI: 10.11949/j.issn.0438-1157.20180302.DOI:
Based on the strong interaction energy between the coordinatively unsaturated metal sites (UMSs) and the gas molecules
M-BTC(M=Cr
Mo
Ni)
isostructural with HKUST-1 (Cu-BTC)
were successfully synthesized via the coordination reaction of the high activity divalent metal (Cr2+/Mo2+/Ni2+) and organic ligand (H3BTC)
and then to gain insight into the impact of gas-metal interactions on the selective adsorption of CH4 from N2 by comparing with classical materials (Cu-BTC). The results show the good CH4 selective adsorption properties of M-BTC (M=Cr
Mo
Ni) with UMSs. Among these materials
Ni-BTC with unsaturated Ni2+ sites presents the highest adsorption heat value for CH4
leading to the excellent CH4/N2 adsorption separation properties; but the Cr-BTC with high Cr2+ activity shows the lower ability for CH4/N2 separation than Cu-BTC. Combined the IAST calculation results
we verified the ability for the selective adsorption of CH4 molecules on M-BTC (M=Cr
Mo
Ni) and Cu-BTC followed as Ni-BTC > Mo-BTC > Cu-BTC > Cr-BTC.