In addition to its exceptional selectivity, Li-2-SAPO-RHO also demonstrated excellent C2H4 uptake under ambient conditions, establishing a new benchmark for C2H4/C2H6 separation (Fig. ). The low experimental adsorption enthalpy (Qst) for C2H4, ranging from 12.0 to 19.0 kJ/mol, further supports its practical application (fig. ). This Qst value is significantly lower than those of C2H4-selective adsorbents such as MOFs with open metal sites (40 -85 kJ/mol) or πcomplexation adsorbents (60 -120 kJ/mol) . The low Qst ensures easy regeneration under mild conditions, enhancing suitability for industrial use.