Original Article:
CO2 capture adsorbents functionalized by amine - bearing polymers: A review
Anish Mathai Varghese, et al.
International Journal of Greenhouse Gas Control 96 (2020): 103005.
10.1016/j.ijggc.2020.103005
Adsorption is an attractive solution for CO2 capture because of minimal utilization of renewable energy, high capture capacity and selectivity, easy processing, and cost-effectiveness. To overcome the challenges of poor performance in terms of adsorption capacity and selectivity, functionalization of the adsorbent with amine-bearing polymers is beneficial to chemically interact with carbon dioxide, thereby significantly enhancing its capture capacity. The introduction of polymeric amines into the porous structure creates the possibility of CO2 capture. Because of their ability to capture carbon dioxide to be effective in both dry and humid environments, polymeric amines containing more primary and secondary amine moieties are the first choice for designs that support amine capture applications. Here, we highlight several typical polymeric amines for functionalized adsorbents, including polyethyleneimine, polypropyleneimine, polyallylamine, and polyaniline, etc.
Functionalization of porous materials with polymeric amines and their CO2 capture
Applications of Polyethyleneimine in Adsorbents
Polyethyleneimine (PEI) is one of the most well-studied aliphatic polymeric amines for carbon dioxide adsorption due to its availability, high carbon dioxide capture capacity, increased amine density, primary amine chain ends, and stability that can sustain carbon dioxide adsorption. PEI is versatile in terms of custom functionalization as it is available in linear, branched or dendritic macromolecular structures and can contain primary, secondary and tertiary amines at the respective chain ends, main chain and branch points. Therefore, PEI has been extensively studied in various supported amine-related carbon dioxide capture applications, such as PEI siliceous adsorbents, clay-supported PEI, PEI carbonaceous materials, alumina-supported PEI, metal-organic framework (MOF)-supported PEI, and Zeolite - supports PEI, etc.
Applications of Polypropyleneimine in Adsorbents
Polypropyleneimine (PPI), which accommodates primary, secondary, and tertiary amines at the corresponding chain ends, main chain, and branch points, supports its potential for carbon dioxide capture. However, limited attempts have been reported on PPI-based carbon dioxide sorbent systems due to monomer synthesis and polymerization time-related complexities. The reported PPI-based carbon dioxide adsorbents include SBA-15 branched PPI composites and GO-PPI dendrimer.
Applications of Polyallylamine in Adsorbents
The molecular structure of polyallylamine (PAA) consists of a high density of primary amines on side chains, which alleviates the problems associated with oxidation and heat resistance. PAA is suitable as a good binder material in amine-supported systems. The research cases of PAA-based adsorbents include SBA-15-supported PAA, fumed silica-supported PAA, silica gel foam-supported PAA, and γ-alumina-supported PAA, etc.
Applications of Polyaniline in Adsorbents
Polyaniline is a conductive polymer whose repeat unit consists of a secondary amine between two aromatic benzene rings. Studies have shown that polyaniline-based adsorbents have applicability for carbon dioxide capture, especially with high potential at higher pressures. Support materials for polyaniline-based adsorbents include silicone-based materials, GO-based materials, multi-walled carbon nanotubes, and magnetite nanocapsules, etc.
Chemicals Related in the Paper:
| Catalog Number | Product Name | Structure | CAS Number | Price |
|---|---|---|---|---|
| ACM30551894 | Poly(allylamine),mw 15000,15% aq. soln. |  |
30551-89-4 | Price |
| ACM313949905 | Polyaniline(emeraldine salt)short ch& |  |
313949-90-5 | Price |
| ACM900298626913064-1 | Polyethylenimine,linear,mw 2,500(pei 2500) |  |
9002-98-6 / 26913-06-4 | Price |
| ACM9002986-3 | Polyethylenimine,branched,mw 600(bpei 600)(500-2500 cps) | |
9002-98-6 | Price |
| ACM25233301 | Polyaniline,emeraldine form(acid doped) |  |
25233-30-1 | Price |
