A disordered mesoporous silica was found to be a promising solid support for CO 2 capture. It was prepared with a process similar to that for MCM-41. X-ray diffraction characterization (XRD) and transmission electron microscopy (TEM) confirmed its disordered structure. N 2 adsorption−desorption tests indicated that its average pore size is significantly larger than that of MCM-41. On this support was deposited acrylamide (AM)-modified tetraethylenepentamine (TEPA), resulting in an adsorbent suitable for CO 2 capture. This material exhibited well balanced adsorption and desorption properties. Substantially higher CO 2 adsorption capacity (159.1 mg/g-adsorbent) was obtained with pure CO 2 at 25 °C, and satisfactory stability during 12 adsorption−desorption turnovers was achieved.

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