Recently, methanol-to-olefins (MTO) technology has been widely used. The development of new adsorbents to separate MTO products and obtain high-purity ethylene (CH) and propylene (CH) has become an urgent task. Herein, an exceptionally highly water-stable metal-organic framework (MOF), [Cu(OH)(MeBPZ)]·(solvent) () (HMeBPZ = 3,3'-dimethyl-1,1'-4,4'-bipyrazole) with hexagonal pores, has been elaborately designed and constructed. After being soaked in water for 7 days, it still maintains its structure, and the uptake of N at 77 K is unchanged. The adsorption capacity of CH can reach 138 cm g, while the uptake of CH is only 52 cm g at 298 K and 1 bar. The dynamic breakthrough experiments show that the mixture of CH/CH (50/50, v/v) can be efficiently separated in one step. High-purity CH and CH can be obtained through an adsorption and desorption cycle and the yields of CH (purity ≥ 99.95%) and CH (purity ≥ 99%) are 84 and 48 L kg, respectively. Surprisingly, when the flow rate is increased, the separation performance has no obvious change. Additionally, humidity has no effect on the separation performance. Finally, theoretical simulations indicate that there are stronger interactions between the CH molecule and the framework, which are beneficial to capturing CH over CH.
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