Extended Data Figure 7 : Dynamic gas adsorption and regeneration energy.

From: Cooperative insertion of CO2 in diamine-appended metal-organic frameworks

Extended Data Figure 7

a, Isobaric, variable temperature (ramp rate of 1 °C min−1) gravimetric adsorption experiments for mmen-Mg2(dobpdc) under 100% CO2. Cooling from 150 to 30 °C is shown as the blue line, and heating from 30 to 150 °C as the red line. Desorption hysteresis was minimal because the phase-transition temperature and pressure are unchanged between adsorption and desorption. b, Regeneration energy calculations for mmen-Mg2(dobpdc) (green) and mmen-Mn2(dobpdc) (blue) indicate that effecting adsorption at high temperatures can be considerably more efficient than adsorption at 40 °C. c, Transient breakthrough of 15% CO2 (green), 4% O2 (red), 1.5% water (black) and balance N2 (blue) through an adsorbent bed packed with mmen-Mg2(dobpdc) at 25 °C. The adsorbent bed was under Ar (purple) before adsorption; a breakthrough CO2 capacity of 2.7 mmol g−1 was calculated.