Polyetheramine improves the CO2 adsorption behavior of tetraethylenepentamine-functionalized sorbents

The dynamic CO2 adsorption of polyethylene polyamine-loaded MCM-41 before and after methoxypolyethylene glycol codispersion

“…15,45 Comparing with MCM-41-PEPA50%, MCM-41-PEPA50%-M5% appeared distinct symmetric and asymmetric stretching vibrations of C-H from the alkyl groups at 2950 and 2840 cm À1 , as well as enhanced characteristic peak at 1230 cm À1 , which is caused from the asymmetric stretching vibrations of C-O-C in the aliphatic ether or the bending vibrations of C-O-H, suggesting that MPEG was also introduced into MCM-41. 42,45 In addition, the peaks characterizing PEPA all obviously enhanced, which is an indication that MPEG promoted the dispersion and exposure of PEPA in the pore channels of MCM-41.…”

“…46 High temperature favors not only the dispersal of viscous PEPA in the pore channels of MCM-41 but also CO 2 ow and collision with exposed active sites, which facilitates CO 2 adsorption on PEPAloaded MCM-41. 15,42 However, adsorption is thermodynamically exothermic, and conversely, high temperature hinders CO 2 adsorption. Therefore, the adsorption performance for PEPAloaded MCM-41 rst increased and then decreased as the temperature was increased; the optimal adsorption temperature, breakthrough and equilibrium adsorption capacity were 60 C, 1.21 and 1.66 mmol g À1 , respectively.…”

“…25 To further improve the dispersion and stability of TEPA or PEI with high viscosity, auxiliary reagents with hydroxyl or ether groups were coloaded into supporting materials for preparing composite sorbents. [41][42][43][44] Jung et al coimpregnated PEI and 1,3-butadienediepoxide (BDDE) with hydroxyl groups in silicas to investigate the improved CO 2 adsorption performance of PEI-loaded silicas, which was primarily attributed to following two aspects. On the one hand, synergistic combinations between hydroxyl groups and the PEI on the inner surface of the supporting materials occurred, which promoted the dispersion and thermostability of PEI in silicas.…”

Study of rice husk ash derived MCM-41-type materials on pore expansion, Al incorporation, PEI impregnation, and CO2 adsorption

“…When these supports were impregnated by PEI, as shown in Fig. 6(b), we can see exclusive peaks for all resulting samples, which are relevant to the PEI appearance, i.e., bands at 2,945 and 2,825 cm 1 , which can be attributed to C-H asymmetric and symmetric stretching vibrations, respectively; at 1,470 cm 1 because of the deformation vibration of CH 2 , and at 1,568 cm 1 owing to the N-H vibration [5,29].…”

“…Multiple amine-containing substances, including monoamines [18,19], diamines [20,21], triamines [22][23][24][25][26], tetraamines and multiple amines [27][28][29] have been successfully deposited on MCM-May, 2019 41-type materials. Because their adsorption performance is highly associated with the surface density of amine groups, multiple amine species are frequently preferred for designing adsorbents.…”