Integration of open metal sites and Lewis basic sites for construction of a Cu MOF with rare chiral Oh type of cage for high performance of methane purification
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Physical Sciences and Engineering (PSE) Division
Chemical Science Program
Biological and Environmental Sciences and Engineering (BESE) Division
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AbstractA Cu MOF [Cu4(PMTD)2(H2O)3]·20H2O, 1, (Where PMTD is (1,4-phenylenebis(5-methyl-4H-1,2,4-triazole-3,4-diyl)bis(5-carboxylato-3,1-phenylene)bis(hydroperoxymethanide) with rare chiral Oh type of cage and dual functionalities of open metal sites and Lewis basic sites based on a designed U-shaped ligand was synthesized by hydrothermal method. It exhibits high-capacity of CO2, C2 and C3 hydrocarbon storage capacity under atmospheric pressure as well as high H2 (1.96% wt) adsorption capacity at 77K. Methane purification capacity was tested and verified step by step. Isosteric heats (Qst) study reveals that CH4 has the weakest van der Waals host- guest interactions among the seven gases at 298K. Ideal adsorbed solution theory (IAST) calculation reveals that compound 1 is more selective toward CO2, C2H6 and C3H8 over CH4 in further calculating its separation capacity, as exemplified for CO2/CH4 (50:50, 5:95), C2H6/CH4 (50:50, 5:95) or C3H8/CH4 (50:50, 5:95) binary gas mixtures. Breakthrough experiments show that 1 has a significantly higher adsorption capacity for CO2, C2H6 and C3H8 than CH4. The selective adsorption properties of 1 make it a promising candidate for methane purification.
CitationShi Z, Meng L, Niu Z, Liang C, Dong X, et al. (2018) Integration of open metal sites and Lewis basic sites for construction of a Cu MOF with rare chiral Oh type of cage for high performance of methane purification. Chemistry - A European Journal. Available: http://dx.doi.org/10.1002/chem.201800010.
SponsorsThis work was supported by the Foundation of the Natural Science Foundation of China (nos. 21621001, 21771077, 21771084 and 21371069), the National Key Research and Development Program of China (no. 2016YFB0701100), the 111 project (no. B17020), the S&T Development Program of Jilin Province of China (no. 20160101325JC). The authors also gratefully acknowledge the financial support from the Natural Science Foundation of China through Research Fund for International Young Scientists scheme (21550110190).
JournalChemistry - A European Journal