Grafting of Amines on Ethanol-Extracted SBA-15 for CO2 Adsorption

Abstract

SBA-15 prepared via ethanol extraction for template removing was grafted with three kinds of amine precursors (mono-, di-, tri-aminosilanes) to synthesis new CO2 adsorbents. The SBA-15 support and the obtained adsorbents were characterized by X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), N2 adsorption/desorption, thermogravimetry (TG), elemental analysis, Fourier transform infrared (FTIR) spectrometry, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that, except higher silanol density, the ethanol-extracted SBA-15 support possessed a more regular mesophase and thicker walls than traditionally calcined samples, leading to a good stability of the adsorbent under steam treatment. The adsorption capacity of different amine-grafted samples was found to be influenced by not only the surface amine density, but also their physiochemical properties. These observations provide important support for further studies of applying amine-grafted adsorbents in practical CO2 capture process.

A heterogeneous organocatalyst for olefin epoxidation

“…Second, the density of the reactive OH groups on the inner surface of the molecular sieve, which is up to c.a. 800 m 2 /g [10][11][12], varies from 3 to 7 silanols per nm 2 . These very silanols are commonly used for the covalent grafting of various modifiers via their reaction with trimethoxy-or ethoxysilyl derivatives of alkanes and arenes [13].…”

Chromium-based metal–organic framework/mesoporous carbon composite: synthesis, characterization and CO2 adsorption

“…Up to date, various porous solid adsorbents, such as zeolites (Shao et al 2009;Miyamoto et al 2012), activated carbons (Guo et al 2006;Yang et al 2011), metal oxides (Martacaltzi and Lemonidou 2008;Li et al 2010), and mesoporous silica and carbon Govindasamy et al 2009), and their amine-modified materials (Chang et al 2009;Li et al 2013), has been developed as effective CO 2 capture adsorbents, but the common shortfalls of these traditional adsorbents are either low capacities and selectivity or difficult regeneration processes (Zhang et al 2011(Zhang et al , 2013.…”

Carbon dioxide adsorption using amine-functionalized mesocellular siliceous foams

“…Grafting method, based on the chemical reaction between surface silanol groups and organosiloxane molecules, has been employed to incorporate aminated organosilanes into a wide range of silica porous supports. 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.…”