Ultra-microporous Sc/In-CPM-66A with low-polar pore surfaces for efficient separation of CH4/N2
The enrichment of low-concentration coalbed methane is of great significance to alleviate the current situation of the shortage of natural gas in China.However,the nitrogen impurities in coalbed methane greatly limit the further application of this resource.Therefore,it is very important to separate the CH4/N2 gas mixture in low concentration coalbed methane.Two low-polar ultra-microporous metal-organic framework materials,Sc-CPM-66A and In-CPM-66A,were prepared to study the performance of the materials in enriching CH4 from CH4/N2 mixture.The structure of the materials was characterized by PXRD,77 K N2 adsorption,TGA and FTIR spectra.IAST selectivity calculations showed that the CH4/N2 selectivity of Sc-CPM-66A and In-CPM-66A reached 6.0.Benefiting from the large number of methyl groups on the surface of the materials,the adsorption heat of the two materials for CH4 was lower than that of most reported materials.The weak interaction between the materials and methane molecules was conducive to the desorption and regeneration of the adsorbent in industrial applications.The penetration experiment further showed that CPM-66A could achieve the separation of CH4/N2 mixtures under dynamic conditions,and the cyclic penetration experiment showed that this type of material had good repeatability.
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