Structure-function, recyclability and calorimetry studies of CO2 adsorption on some amine modified Type I & Type II sorbents

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

“…[1][2][3] Solid amine adsorption technology, with weak corrosivity, highly efficient adsorption performance and low regeneration energy consumption, is recognized as an effective method. [4][5][6][7] So far the study of amine-loaded solid sorbents mainly focuses on immobilizing amines onto the inner surface of porous supporting materials, such as metal-organic frameworks (MOFs), [8][9][10][11][12][13] mesoporous molecular sieves, 14-22 silicas [23][24][25][26][27][28][29][30][31] and so on. [32][33][34][35][36][37][38][39][40] Chen et al incorporated polyethyleneimine (PEI) into mesoporous zeolite 13X prepared by pore-expanding original micropores; due to PEI-dispersion in mesopores, the CO 2 adsorption capacity for PEI-modied 13X reached 80 mg g À1 at 100 C under a pure CO 2 atmosphere.…”

“…Both sorbents showed significant adsorption capacities and consistent regenerability during 3–5 adsorption–desorption cycles. 5 Cheng et al incorporated amines into silicas with trimodal pore structures, and the nanocomposite sorbents suggested rapid adsorption kinetics and good adsorption performance, with an adsorption capacity of 172 mg g −1 being obtained for an amine loading amount of 70 wt%. 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.…”

Overcoming mass transfer limitations in cross-linked polyethyleneimine-based adsorbents to enable selective CO2 capture at ambient temperature

“…Their slower adsorption and lower uptakes at 30 °C suggest that 10 : 1 (V) and 25 : 1 (V) are limited in their adsorption potential by a diffusional barrier; however, increasing temperature results in decreased hydrogen bonding between polyamine chains and higher chain mobility, enabling CO 2 to overcome this diffusion resistance, and uptake increases, as has been frequently observed for PEI-based CO 2 adsorbents. 23,24,27,56 From 30 °C to 60 °C, the maximum adsorption of 10 : 1 (V) increases by 12.47% (relative to adsorption at 30 °C), while 25 : 1 (V) improves by more than twice that at 29.00%. Although 25 : 1 (V) has better absolute adsorption capacity, 10 : 1 (V) may be experiencing relatively less diffusion resistance at 30 °C, which may suggest a structure that better enables gas transport.…”

Mesoporous silica supported amine and amine-copper complex for CO2 adsorption: Detailed reaction mechanism of hydrophilic character and CO2 retention

“…Their surfaces containing silanol groups are the key factors of these ranges of materials; it is easily possible to functionalize them by different organic molecules to improve their performance through the CO 2 adsorption. The interactions between carbon dioxide and the surface of the materials differ according to the nature of the functionalized molecules or immobilized metals on the surface of the materials [28][29][30][31][32].…”

“…In recent years, amine-functionalized materials have attracted considerable interest, especially in the capture of carbon dioxide [30][31][32]. These hybrid materials are capable to adsorb the CO 2 at lower pressure [30][31][32]; they exhibit high selectivity and affinity towards carbon dioxide [30][31][32]. The adsorption kinetics for these kinds of materials is fast, their energy costs are quite low and their adsorption behaviors in the presence of moisture are efficient [33].…”