Mesoporous magnesium oxides with a high surface area (672–686 m2/g) were synthesized by an aerogel method and subsequently evaluated for CO2 capture efficiency under ambient-temperature sorption and intermediate-temperature regeneration. The effects of one-step (MgO-1) and four-step (MgO-4) calcination methods on the as-prepared MgO samples were evaluated with respect to textual properties and CO2 sorption capacity at various temperatures (30–350 °C). The as-prepared MgOs showed greater than 10 wt% of CO2 sorption at 30 °C, showing very fast sorption of more than 7 wt% CO2 within 5 min. The cyclic stability of the sorbents was tested by using CO2 sorption at 30 °C and N2 regeneration at 450 °C. The sorption performance of MgO-1 was more stable and higher than that of MgO-4, but the surface area and pore volume were still reduced. The cyclic sorption capacity became 6.1 wt% at the condition of mixture gas sorption (CO2/N2: 15/85 vol%) and CO2 regeneration. Since inter-crystallites coupling plays an important role in pore formation as well as stability, calcination condition can contribute to preventing the degradation level of performance and textural properties of sorbents.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics