Figure 9.

Cycling data for the final 100 of 750 adsorption/desorption cycles for 2-ampd–Mg₂(dobpdc) in a simulated temperature swing adsorption process. Adsorption: humid 4% CO₂ in N₂, 40 °C, 5 min (black, cycle maxima). Desorption: Humid CO₂, 140 °C, 1 min (red, cycle minima). The cycled capacity (difference) is shown in blue. The baseline value of 0 g/100 g is defined as the mass after activation under 4% CO₂ in N₂ at 150 °C for 20 min prior to the first cycle. The diamine loading was reduced from 100% to 94% after this experiment. The same final loading was observed after 200 adsorption/desorption cycles, suggesting that the diamine loading stabilizes after initial loss. The weight loss due to diamine volatilization correlates with equilibration of the mass upon desorption to the observed negative baseline value.