目前,低温精馏等传统的气体分离方法存在效率低、成本高和具有安全隐患等问题。最近,具有独特性能的MOF膜逐步成为研究热点。ZIF-67是一种超微孔尺寸的MOF材料,由于其孔径定义明确,尤其是3.4的小尺寸,使其具有高效的气体吸附和分离能力,适合根据分子大小进行分离,因此是捕获CO2的理想材料。并且,ZIF-67具有出色的热稳定性,这在实际应用中至关重要。探讨了使用α-Al2O3载体管,通过传统的二次生长方法从ZIF-67纳米片晶种生长出高分离性能的ZIF-67膜。并通过优化合成条件,获得了出色的CO2分离性能,理想的H2/CO2选择性为26.99,H2通量为2.41×10-8mol/(s·Pa·m2)。
Currently,traditional gas separation methods such as cryogenic distillation suffer from low efficiency,high cost and safety hazards.Recently,MOF membranes with unique properties have gradually become a research hotspot.ZIF-67 is an ultra-microporous sized MOF material,which is ideal for carbon dioxide capture due to its well-defined pore size,especially its small size of 3.4Å,which makes it highly efficient in gas adsorption and separation,and suitable for separation according to the size of molecules.Moreover,ZIF-67 has excellent thermal stability,which is crucial in practical applications.In this study,we investigated the growth of ZIF-67 membranes with high separation performance from ZIF-67 nanosheet crystal species by a conventional secondary growth method using α-Al2O3 carrier tubes.By optimizing the synthesis conditions,excellent CO2 separation performance was achieved,with an ideal H2/CO2 selectivity of 26.99 and an H2 flux of 2.41×10-8mol/(s·Pa·m2).
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