CO2 adsorption on APTES functionalized mesocellular foams obtained from mesoporous silicas

CO2 adsorption on amine modified mesoporous silicas: Effect of the progressive disorder of the honeycomb arrangement

“…Elemental analysis of these samples ( Table 2) shows that the addition of fluoride also affects negatively the efficiency of grafting, as reflected in the quantity of N incorporated, which is in accordance with the lower CO 2 uptake. Table 2 also shows the values of surface coverage [51]. In general terms, the progression to less ordered silicas is closely related to lower surface coverage values, which may be due to a lower silanol density in MCF type supports, leading to less nitrogen incorporation upon APTES grafting.…”

“…The wide bands in the range of 3740-3415 cm À1 were assigned to the overlapping of the O-H stretching bands of hydrogen-bonded water molecules (H-O-H) and SiO-H stretching mode of the hydrogen of surface silanol bonded to molecular water (SiO-OÁ Á ÁH 2 O) [60]. The sharp band located at above 3700 cm À1 can be assigned to the symmetrical stretching vibration mode of O-H from isolated terminal silanol groups [51]. Finally, the band located at 1631 cm À1 has been assigned to H-O-H bending vibrations [59].…”

“…It has been reported that such modifications in the synthesis tend to lead to the formation of mesocellular silica foams (MCFs), which have larger pore width and shorter pore length than SBA-15 [51]. The addition of NH 4 F produces a change in the uniform cylindrical pore diameter of the typical honeycomb arrangement of SBA-15, leading to uniform spherical cells that are interconnected by windows with a narrow distribution, thus creating a continuous 3D porous network [52][53][54], with different pore sizes and volumes.…”

APTES grafted ordered mesoporous silica KIT-6 for CO2 adsorption

“…CCS is important to mitigate the global warming and its consequences by capture of CO 2 from large anthropogenic sources. Aqueous alkanolamines and chilled ammonia based absorption process [5,6], membrane separation process [7,8], novel cryogenic process [9], algal biomass process [10,11] and porous solid adsorption process [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] are most commonly used for CO 2 capture. Among these processes aqueous alkanolamine especially monoethanolamine (MEA) and diethanolamine (DEA) based absorption process is well known with significant commercial application for CO 2 capture.…”

“…Adsorption is an alternate and cost effective CO 2 capture process. In the recent years microporous activated carbon [22,23], metal organic frameworks (MOFs), zeolites [24,25] and amine functionalized silica and foams based adsorption processes [12][13][14][15][16][17][18][19][20][21][26][27][28][29] have shown strong potential for CO 2 capture.…”