Ethylene (C 2 H 4 ), an important chemical feedstock and industrial gas, has been widely used to produce polymers (e.g., plastics) and other valued products in modern life. Currently, C 2 H 4 is mainly produced by the thermal cracking of ethane (C 2 H 6 ) or naphtha, with the inevitable presence of acetylene (C 2 H 2 ) and C 2 H 6 byproducts. Thus, separating C 2 H 2 and C 2 H 6 from these mixtures is an industrial necessity to obtain polymer-grade C 2 H 4 (>99.9% purity), but remains a significant challenge because of their very similar physical properties, including boiling points, quadrupole moment, and kinetic diameter. Recently, as an alternative separation technology, the utilization of porous materials as sorbents for C 2 H 4 purification has attracted widespread interest due to their high efficiency and environmental friendliness. In this regard, porous crystalline adsorbents such as metal-organic frameworks (MOFs) and hydrogen-bonded organic frameworks (HOFs) have been developed for C 2 -gases mixture separation, significant progress has been devoted to addressing the efficient separation of C 2 H 4 from binary C 2 H 2 /C 2 H 4 and C 2 H 6 /C 2 H 4 mixtures due to their well-defined structure, controllable pore size and modifiable pore environment. Because of the difficulty in designing and synthesizing materials that preferentially trap C 2 H 2 and C 2 H 6 , simultaneous removal of both C 2 H 2 and C 2 H 6 from ternary C 2 H 2 /C 2 H 6 /C 2 H 4 mixtures in a one-step process is still underexplored. Besides, the reported MOF and HOF adsorbents generally suffer from poor chemical stability, high cost and unscalable products, which hamper their practical applications. Thus, developing inexpensive and chemically robust adsorbents with excellent C 2 -gases mixture separation properties is urgently needed for the industrial purification of C 2 H 4 .