Breakthrough tests
The breakthrough experiments for C2H2/C2H4(1/99, v/v) mixtures were carried out at a flow rate of 1.25 mL/min (298 K, 1.01 bar). In the separation experiment, Zn2(bpy)(btec) sample (3.0575 g) was packed into Φ 4×275 mm stainless steel column, and the column was activated under reduced pressure at 150 °C overnight. The experimental set-up consisted of two fixed-bed stainless steel reactors. One reactor was loaded with the adsorbent, while the other reactor was used as a blank control group to stabilize the gas flow. The horizontal reactors were placed in a temperature-controlled environment, maintained at 298 K. The flow rates of all gas mixtures were regulated by mass flow controllers, and the effluent gas stream from the column was monitored by gas chromatography. Prior to the breakthrough experiment, we activated the sample by flushing the adsorption bed with helium gas for 2 hours at 150 °C. Subsequently, the column was allowed to equilibrate at the measurement rate before we switched the gas flow.