Triamine-grafted pore-expanded mesoporous silica for CO2 capture: Effect of moisture and adsorbent regeneration strategies

Abstract

Adsorption of carbon dioxide (CO 2 ) was investigated on triamine-grafted, pore-expanded MCM-41 mesoporous silica (TRI-PE-MCM-41). Measurements of adsorption capacity using mass spectrometry showed an enhanced CO 2 adsorption capacity in humid streams compared to dry CO 2 . This was corroborated with breakthrough experiments, which also showed that TRI-PE-MCM-41 offered a practically infinite selectivity towards CO 2 over nitrogen. Cyclic measurements of pure CO 2 and CO 2 :N 2 = 10:90 mixture using different regeneration modes showed that aminegrafted PE-MCM-41 is particularly suitable for CO 2 removal using temperature swing adsorption (TSA) at adsorption temperatures higher than ambient, while temperaturevacuum swing adsorption (TVSA) may be attractive at ambient temperature.

The capture of carbon dioxide by transition metal aluminates, calcium aluminate, calcium zirconate, calcium silicate and lithium zirconate

“…A proportional mixture of calcium silicate, water and CO 2 reacts within period of 15 min. The moisture effect is also a dominating factor for the capturing of carbon dioxide by the adsorbents [45].…”

Post-Combustion CO2Capture by Vacuum Swing Adsorption Using Zeolites – a Feasibility Study

“…1): two mordenites with different Si/Al ratios and two USY zeolites with different Si/Al ratios. Of these four samples, only the CVB10a was in the Na + form, the other zeolites have NH 4 + as extra-framework cation. The NH 4 + zeolites were transformed into Na + zeolites by a three-fold ion exchange with a 0.5 molar solution of NaCl at 363 K. A reference sample of zeolite NaX was provided by CECA.…”

“…We therefore need highly selective CO 2 sorbents. That is why many aminebased solid sorbents have been studied for post-combustion CO 2 capture [3][4][5][6][7][8][9]. Amines can be immobilized on a solid support either by impregnation or by grafting [10].…”

Carbon dioxide adsorption using amine-functionalized mesocellular siliceous foams

“…Organosilanes, such as 3-aminopropyltrimethoxysilane (APTMS) [33][34][35][36][37][38], N-(2-aminoethyl)-3-aminopropyltrimethoxysilane [39][40][41][42], and diethylenetriamino-trimethoxysilane [39,40,43,44], have been grafted on different mesoporous silicas and evaluated their adsorption capacities toward CO 2 . The influence of amine structure [39,40,44], pore structure [45,46], amine surface density [47], stability and adsorption mechanism [34,[48][49][50] were studied. When the grafting method is used, CO 2 adsorption capacity depends on the amine density and the total nitrogen content.…”