Table 4. Enthalpy Changes Corresponding to the Desorption Steps of CO2 Captured at 5 and 30 °C, Calculated Based on TG- and DSC-TPD Profiles, of the Most Active Adsorbent Mg(OH)2 + 20% F Calcined, for 3 h in Air, at 400 and 500 °C.
| Mg(OH)2 + 20% F at 400 °C |
Mg(OH)2 + 20% F at 500 °C |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| step-1(29–225 °C) |
step-2(290–450 °C) |
step-1(29–225 °C) |
step-2(290–450 °C) |
|||||||||
| experimental condition | Desor. CO2mgCO2·g–1 | ΔH1(J·mol–1) | Tmax1(°C) | Desor. CO2mgCO2·g–1 | ΔH2(J·mol–1) | Tmax2(°C) | Desor. CO2mgCO2·g–1 | ΔH1(J·mol–1) | Tmax1(°C) | Desor. CO2mgCO2·g–1 | ΔH2(J·mol–1) | Tmax2(°C) |
| CO2 capture at 5 °C | 55.2 | 599.5 | 105 | 41.8 | 561.1 | 374, 410 | 49.9 | 528.5 | 101 | 27.0 | 572.6 | 379 |
| CO2 capture at 30 °C | 43.1 | 825.1 | 111 | 41.0 | 503.8 | 357, 400 | 32.6 | 526.3 | 108 | 15.3 | 584.1 | 359 |