Amine tethered pore-expanded MCM-41: A promising adsorbent for CO 2 capture

Carbon capture using amine modified porous carbons derived from starch (Starbons®)

“…The study conducted in Lashaki et al [33] explains the relation between pore volume and CO 2 uptake. Loganathan et al [34], in its CC experiments on MCM-41, also reported findings in agreement with Lashaki et al [33]. In both the above studies, the trend was such that adsorbents with higher pore volumes exhibited higher CC values.…”

Silanol-rich platelet silica modified with branched amine for efficient CO2 capture

“…Steep adsorption of N 2 at very low relative pressures can be attributed to the micropores formed by the PEO segment of the surfactant during synthesis 4 , or monolayer-multilayer surface adsorption of N 2 on the materials 24 . The adsorption branch of both isotherms showed clear adsorption hysteresis of a Type IV isotherm at relative pressure of ~0.7 to ~0.75, due to capillary condensation into large mesopores 4,5 . The increase in N 2 adsorption at p/ p 0 > 0.98 is related to slit-shaped macropores larger than 50 nm (Figure 1a).…”

“…Solid adsorbents, such as zeolites, metal oxides, metal-organic frameworks (MOF), and solid amine adsorbents have therefore emerged as promising alternatives for CO 2 capture 3 . Among these adsorbents, aminefunctionalized mesoporous silica has received intensive research attention due to its tunable pore structures and high adsorption capacity under industrial relevant conditions 4-12 . Organic amines can be attached to the silica surface via chemical grafting 4,5 or physical impregnation [6][7][8][9][10][11][12] . To date, most studies on porous silica-amine adsorbents adopt linear short chain amines, such as diethylenetriamine (DETA), tetraethylenepentamine (TEPA) and polyethyleneimine (PEI, M w < 800).…”

Synthesis and functionalisation of spherical meso-, hybrid meso/macro- and macro-porous cellular silica foam materials with regulated pore sizes for CO2 capture

“…16,17 Among the candidate sorbent materials, immobilized amines possess many desirable CO 2 adsorptive properties that may not be easily obtained with other sorbent materials, such as their extremely high CO 2 selectivity, fast adsorption kinetics and high adsorption capacity especially at very low CO 2 partial pressures, great moisture tolerance and favourable operating temperature window of 50-80 C that minimizes or essentially eliminates the cooling need of typical ue gas streams from power plants. [18][19][20][21][22][23] The CO 2 adsorption of immobilised amine adsorbents follows similar reaction mechanisms to those in the aqueous amine absorption process, which involves the reversible formation of ammonium carbamate under anhydrous ue gas conditions and ammonium bicarbonate under wet conditions. Two typical preparation methodologies are used, namely surface graing and direct impregnation.…”