Abstract
Functionalized hypercrosslinked polymers (HCPs) with surface areas between 213 and 1124 m2/g based on a range of monomers containing different chemical moieties were evaluated for CO2 capture using a pressure swing adsorption (PSA) methodology under humid conditions and elevated temperatures. The networks demonstrated rapid CO2 uptake reaching maximum uptakes in under 60 s. The most promising networks demonstrating the best selectivity and highest uptakes were applied to a pressure swing setup using simulated flue gas streams. The carbazole, triphenylmethanol and triphenylamine networks were found to be capable of converting a dilute CO2 stream (>20%) into a concentrated stream (>85%) after only two pressure swing cycles from 20 bar (adsorption) to 1 bar (desorption). This work demonstrates the ease with which readily synthesized functional porous materials can be successfully applied to a pressure swing methodology and used to separate CO2 from N2 from industrially applicable simulated gas streams under more realistic conditions.
Highlights
In this work we report the synthesis, characterization and implementation of functional hypercrosslinked polymers (HCPs) networks for use as solid sorbents using a pressure swing adsorption (PSA) approach
Seven hypercrosslinked polymers were synthesized from functionalized monomers, all possessing different chemical moieties to study how these groups affected the CO2 uptake and selectivity at high pressure
A non-functionalized network was synthesized from polystyrene which provides a non-functionalized network, which could be synthesized from waste polymers [76]
Summary
Has accelerated, numerous sorbents demonstrating CO2 capturing capabilities have been reported [17,18,19], mainly using the temperature swing approach [3,11,12,20] These include zeolites [21], hybrid materials such as metal organic frameworks (MOFs) [22], activated carbons, ionic liquids [23,24] and microporous organic polymers (MOPs) [25,26,27,28,29,30,31]. One class of MOP stands out for the application of carbon dioxide capture due to their low skeletal density, chemical and thermal stability and synthesis using cheap, readily available starting materials on a large scale—hypercrosslinked polymers (HCPs) [27,28,29,63]. In order to keep the study industrially applicable, all samples were exposed to more industrially relevant gas streams, and the materials themselves were exposed to the humid laboratory conditions and not merely used immediately after drying
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