Highly Stable Amine-modified Mesoporous Silica Materials for Efficient CO2 Capture

Abstract

A highly efficient and stable solid adsorbent invoking a direct incorporation of tetraethylenepentamine (TEPA) onto the as-synthesized mesocelullar silica foam (MSF) has been developed for CO 2 capture. Unlike most amine-functionalized silicas, which typically exhibit CO 2 adsorption capacities less than 2.0 mmol/g, such organic template occluded mesoporous silica-amine composites exhibited remarkably high CO 2 uptake as high as 4.5 mmol/g at 348 K and 1 atm. Moreover, notable increases in CO 2 adsorption capacities of the composite materials were observed when in the presence of humidity. Durability test performed by cyclic adsorption-desorption revealed that such adsorbents also possess excellent stability, even though a slight decrease in adsorption capacity over time was observed.

Spectroscopic Investigation into Oxidative Degradation of Silica‐Supported Amine Sorbents for CO2 Capture

“…A maximum CO 2 capture capacity of 4.5 mmol g −1 was reported on TEPA/MSF sorbent with 35 % amine efficiency 22. mescocellular silica foam (MSF) is a high surface area mesoporous material prepared from costly precursors.…”

Application of polyethylenimine‐impregnated solid adsorbents for direct capture of low‐concentration CO2

“…The supports are widely screened including silica materials, [27][28][29][30][31][32][33][34][35] microporous metal-organic framework, 36,37 carbon nanotubes, 38,39 PMMA-based resins, 15,40 mesoporous carbon, 41,42 mesoporous alumina, 43 and nanofibrillated cellulose. 44,45 The amines generally contain primary or secondary alkylamines and alkanolamines, such as polyethylenimine (PEI), [46][47][48] tetraethylenepentamine (TEPA), [49][50][51] and 3-aminopropyltrimethoxysilane. 52 Futhermore, hyperbranched aminosilicas prepared by in situ aziridine polymerization on porous solids have been reported as adsorbents for CO 2 capture from the air.…”

CO2 adsorption on Santa Barbara Amorphous-15 (SBA-15) and amine-modified Santa Barbara Amorphous-15 (SBA-15) with and without controlled microporosity

“…Various mesoporous silicas, such as MCM-41 [18,19], MCM-48 [20][21][22], pore-expanded MCM-41 [23,24], SBA-12 [25], SBA-15 [5,8,9,[26][27][28][29][30][31][32], SBA-16 [33], KIT-6 [34], HMS [35], mesocelullar silica foam [14,36], and mesoporous silica microspheres [37] were investigated. The influence of pore structure such as pore size [34], pore volume [27], pore length [38] and surface chemistry properties [5,39] of the support on CO 2 adsorption performance was studied.…”