A solid molecular basket sorbent for CO₂capture from gas streams with low CO₂concentration under ambient conditions

Abstract

In this paper, a solid molecular basket sorbent, 50 wt% PEI/SBA-15, was studied for CO(2) capture from gas streams with low CO(2) concentration under ambient conditions. The sorbent was able to effectively and selectively capture CO(2) from a gas stream containing 1% CO(2) at 75 °C, with a breakthrough and saturation capacity of 63.1 and 66.7 mg g(-1), respectively, and a selectivity of 14 for CO(2)/CO and 185 for CO(2)/Ar. The sorption performance of the sorbent was influenced greatly by the operating temperature. The CO(2)-TPD study showed that the sorbent could be regenerated under mild conditions (50-110 °C) and was stable in the cyclic operations for at least 20 cycles. Furthermore, the possibility for CO(2) capture from air using the PEI/SBA-15 sorbent was studied by FTIR and proved by TPD. A capacity of 22.5 mg g(-1) was attained at 75 °C via a TPD method using a simulated air with 400 ppmv CO(2) in N(2).

Carbon dioxide adsorption using amine-functionalized mesocellular siliceous foams

“…In the past decade, development of processes based on solid adsorbents has been considered as alternative separation technologies for postcombustion CO 2 capture. Porous solids such as zeolites [2][3][4][5], activated carbons [6][7][8][9], hydrotalcites [10][11][12][13][14], metal-organic frameworks [15][16][17] and mesoporous silicas [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] are good candidates for capturing CO 2 .…”

“…Various mesoporous solid supports with different pore structures were investigated, such as SBA-15 [18][19][20][21][22][23], SBA-16 [24], SBA-12, MCM-41 [22][23][24]31], MCM-48 [51], KIT-6 [24], MSU-1 [52], HMS [32], silica gel [53,54], and mesocellular silica foam [25-29, 55, 56]. A series of studies had reported that the adsorbents with large total pore volume and pore diameter reached significant CO 2 uptakes, which is attributed to the positive effect of the large pore volume and pore diameter [19,21,23,24].…”

CO2 adsorption on amine-modified mesoporous silicas

“…In this case, the silica support plays an important role in the adsorption capacity of these amine modified adsorbents. A variety of mesoporous silica materials including MCM-41 [14][15][16], MCM-48 [17], SBA-15 [18][19][20][21][22], SBA-16, SBA-12, KIT-6, MSU-1, and MCF [23][24][25][26] were investigated as the supports of aminefunctionalized adsorbents. Ahn's group investigated a series of PEI-loaded mesoporous silica materials, MCM-41, MCM-48, SBA-15, SBA-16, and KIT-6.…”

CO2 Capture Behaviors of Amine-Modified Resorcinol-Based Carbon Aerogels Adsorbents

“…The CO 2 adsorption capability is determined by the adsorption kinetics and the thermodynamics (Chen et al, 2010;Wang et al, 2012). The CO 2 adsorption process mainly includes two processes.…”

“…Zeolites with highly crystalline structure, high surface area, and 3-dimensional pore structures by altering their composition as Si/Al ratio have been widely applied as CO 2 adsorbents (Yu et al, 2012;Lee et al, 2013). Mesoporous molecular sieves (Gil et al, 2011;Wang et al, 2012;Xu et al, 2003) are widely used as adsorbents for gas separation because of the high surface area, large pore volume and tunable pore size. Metal-organic frameworks (MOFs) (Cho et al, 2012;Ganesh et al, 2014;Xian et al, 2015) have caused extensive concerns in the recent years due to the notably high surface area, controllable pore structure and pore surface property, and relevant researches on this field of CO 2 adsorption are on the rise.…”