Four different types of amine-attached MCM-48 silicas were prepared and investigated for CO(2) separation from N(2). Monomeric and polymeric hindered and unhindered amines were attached to the pore surface of the MCM-48 silica and characterized with respect to their CO(2) sorption properties. The pore structures and amino group content in these modified silicas were investigated by XRD, FT-IR, TGA, N(2) adsorption/desorption at 77 K and CHN/Si analysis, which confirmed that in all cases the amino groups were attached to the pore surface of MCM-48 at 1.5-5.2 mmol/g. The N(2) adsorption/desorption analysis showed a considerable decrease of the pore volume and surface area for the MCM-48 silica containing a polymeric amine (e.g., polyethyleneimine). The CO(2) adsorption rates and capacities of the amine-attached MCM-48 samples were studied employing a sorption microbalance. The results obtained indicated that in addition to the concentration of surface-attached amino groups, specific interactions between CO(2) and the surface amino groups, and the resultant pore structure after amine group attachment have a significant impact on CO(2) adsorption properties of these promising adsorbent materials.

Tailoring pore properties of MCM-48 silica for selective adsorption of CO2

Amine–silica composites for CO2 capture: A short review

Composites of poly(ethylenimine) (PEI) and mesoporous silica are effective, reversible adsorbents for CO2, both from flue gas and in direct air-capture applications. The morphology of the PEI within the silica can strongly impact the overall carbon capture efficiency and rate of saturation. Here, we directly probe the spatial distribution of the supported polymer through small-angle neutron scattering (SANS). Combined with textural characterization from physisorption analysis, the data indicate that PEI first forms a thin conformal coating on the pore walls, but all additional polymer aggregates into plug(s) that grow along the pore axis. This model is consistent with observed trends in amine-efficiency (CO2/N binding ratio) and pore size distributions, and points to a trade-off between achieving high chemical accessibility of the amine binding sites, which are inaccessible when they strongly interact with the silica, and high accessibility for mass transport, which can be hampered by diffusion through PE...

http://pubs.acs.org/doi/pdf/10.1021/jacs.5b06823

Linking CO2 Sorption Performance to Polymer Morphology in Aminopolymer/Silica Composites through Neutron Scattering

Silica materials are used in a wide range of applications such as catalysis, photocatalysis, CO2 capture, and environmental remediation. These nanomaterials (NMs) have been extensively investigated...

https://espace.library.uq.edu.au/view/UQ:82822b5/UQ82822b5_OA.pdf

Functional Mesoporous Silica Nanomaterials for Catalysis and Environmental Applications

Hybrid materials by functionalization of fibrous nanosilica (KCC-1) were synthesized for efficient CO2 capture, using various amine molecules by physisorption (ads.) as well as covalent attachment. Their CO2 capture efficiency was studied using various parameters, such as CO2 capture capacity, kinetics of adsorption, stability of the sorbent, and regeneration-reuse properties. The best KCC-1 sorbent (i.e., KCC-1-TEPAads) was then studied for the effects of solvents, adsorption temperature and TEPA (tetraethylene pentamine) loading on its textural properties and CO2 capture efficiency and compared with its MCM-41 counterparts. The textural properties of MCM-41 sorbents were drastically affected with loss of more than 99% of their surface area and pore volume, while KCC-1 based sorbents were able to retain a good amount of surface area and pore volume. Notably, the KCC-1-based sorbents exhibited better CO2 capture capacity, rate of adsorption and stability than their MCM-41 counterparts (MCM-41/TEPAads). The total CO2 capture capacity after 21 cycles under humid conditions was 91.5 mmol g−1 for KCC-1-TEPAads but 73.1 mmol g−1 for MCM-41-TEPAads, indicating the superior capacity and stability of the KCC-1-based sorbents even under humid conditions. The better performance of the KCC-1-based sorbents was due to their unique fibrous morphology, accessible surface area and pore volume, which were retained even after functionalization. These results indicate the critical role of the silica morphology as well as the advantages of KCC-1 silica over MCM-41 for the design of efficient CO2 sorbents.

/pdf/design-of-co2-sorbents-using-functionalized-fibrous-51inwexrqt.pdf

Design of CO2 sorbents using functionalized fibrous nanosilica (KCC-1): insights into the effect of the silica morphology (KCC-1 vs. MCM-41)

Amine-modified ordered mesoporous silica: The effect of pore size on CO2 capture performance

The objective of this research was to develop a new CO2 sorbent, three-dimensional nitrogen-doped mesoporous carbon (KIT-6-CN). KIT-6-CN was synthesized by nano-replication using carbon tetrachloride and ethylenediamine as precursors, and KIT-6 with cubic Ia3d symmetry as a hard template. The new CO2 sorbent has a relatively high BET surface area of 587 m2/g, a high pore volume of 0.91 cm3/g, and the mesostructures with pore diameters centered at 1.7 and 6.3 nm. The transmission electron microscopy of the KIT-6-CN shows that after removal of silica by NaOH, KIT-6-CN possesses three-dimensional mesoporous structure. CO2 adsorption–desorption isotherms indicate that this nitrogen-doped material has relatively high CO2 capture capacities of 2.11 mmol/g at 25 °C and 3.09 mmol/g at 0 °C, which are superior to those of the pure carbon material (KIT-6-C) with analogous mesostructures. Cyclic CO2 sorption–desorption tests demonstrated the stability of the sorbent. Thus, the new sorbent can potentially be a good candidate for CO2 capture.

Synthesis of nitrogen-doped carbon with three-dimensional mesostructures for CO2 capture

Mesoporous silica nanoparticles with chiral pattern topological structure function as "antiskid tires" on the intestinal mucosa to facilitate oral drugs delivery.

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Amine-modified ordered mesoporous silica: The effect of pore size on CO2 capture performance

Synthesis of nitrogen-doped carbon with three-dimensional mesostructures for CO2 capture

Mesoporous silica nanoparticles with chiral pattern topological structure function as "antiskid tires" on the intestinal mucosa to facilitate oral drugs delivery.