AM-TEPA Impregnated Disordered Mesoporous Silica as CO₂ Capture Adsorbent for Balanced Adsorption–Desorption Properties

Abstract

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.

Synergistic enhancement of CO2 uptake in highly ordered mesoporous silica-supported zinc-functionalized ionic liquid sorbents

“…Colored band show the range. This work (d, colored), DBUOH/amorphous silica@298 K (e, s) [25], DBUOH/SBA-15@298 K (D) [25], CP/SBA-15@298 K (d, black) [26], AO/SBA-15@298 K (Ç, black) [26], Arg/PSS-PMMA@298K39 (h) [27], EmimGly/PMMA@313 K (N, black) [28], AM-TEPA/DMS@298 K (j, black) [29], PEI/clay@348 K (x) [30], TEPA/SiO 2 aerogel@348 K (+, ⁄) [31]. This unprecedented capacity of the hybrid sorbents (sevenfold increase compared with the bulk, and threefold compared with the support) is superior to many other widely explored supported amine-based systems [23][24][25][26][27][28][29][30][31], as shown in Fig.…”

Carbon dioxide adsorption by zinc-functionalized ionic liquid impregnated into bio-templated mesoporous silica beads

“…This limitation was overcome by spreading a thin layer of IL on a solid support resulting in enhanced rates and reversible adsorption in several supported IL systems [56][57][58]. For the two ILs considered here, CO 2 absorption by bulk ET is characterized by purely physisorption while EZT3 exhibits both physical and chemical absorption [18].…”

Titanium-incorporated organic–inorganic hybrid adsorbent for improved CO2 adsorption performance

“…All of the reagents were used as received without further purification. Siliceous material DMS and amine TN were prepared similar to the procedure described in our previous reports [17].…”