Porous Polymer Supported Amino Functionalized Ionic Liquid for Effective CO₂ Capture

Abstract

A decrease in CO 2 emissions is urgently required in the present situation due to the fast growth of carbon dioxide (CO 2 ) in the atmosphere, which has caused a series of global climate issues. This study used an impregnation−evaporation method to immobilize an amino functionalized ionic liquid [C 2 OHmim][Lys] on a chromatographic column filler GDX-103 and create a novel supported ionic liquid. The results showed that the supported ionic liquid with 60 wt % ionic liquid content had the best adsorption performance at 40 °C, and the CO 2 adsorption isotherm showed that the adsorption capacity at 0.1 MPa was 1.29 mmol CO 2 /g sorbent, which was 6 times greater than the adsorption capacity of the pure carrier. The sample with 60% ionic liquid content has an adsorption capacity of 1.02 mmol CO 2 /g sorbent under the condition of CO 2 /N 2 mixed gas with 10% CO 2 content. This is 43 times greater than the adsorption capacity of the pure carrier, and its adsorption performance is stable after three adsorption and desorption cycles. Through the rich porous structure of GDX-103, the ionic liquid is effectively supported and dispersed, which expands the contact area between CO 2 and ionic liquid and enhances the mass transfer of CO 2 . At the same time, CO 2 can be chemically bound to the groups on the anion of ionic liquid and be immobilized, so it has a high selective adsorption capacity of CO 2 , which makes it a great alternative to traditional CO 2 adsorbents.

Enhanced CO2 Capture through SAPO-34 Impregnated with Ionic Liquid

“…This resulted in a distinct structure compared to the bulk IL, which in turn enhanced the equilibrium sorption amount and rate. 8,42,43 As the sorption time progressed, the sorption rates of all of the samples decreased. This is primarily due to the high diffusion resistance of gas in the IL and micropores.…”

“…Among them, the composite of absorbents and adsorbents (i.e., absorbents combined with adsorbents) combines the advantages of both absorbent and adsorbent, and as reported, they can significantly improve the CO 2 sorption capacity and selectivity, as well as the sorption rate. , Currently, amines or ionic liquids (ILs) combined with solid adsorbents are common composites developed for CO 2 capture. Studies have shown that such composites can enhance the sorption capacity, rate, and selectivity of CO 2 . − However, these materials commonly exhibit a trade-off of sorption amount and desorption heat. For example, the PEI/SiO 2 sorbent exhibited a CO 2 sorption of more than 1.39 mmol g –1 at 313 K, but the desorption heat was 100 kJ mol –1 .…”

2023 Highlights in Interface Science and Engineering: A Collection of Virtual Special Issues

“…Reactive separation has become an established method for CO 2 capture and has been widely used in industrial applications . Ongoing research continues to explore the effectiveness of new solvents, including ionic liquids and deep eutectic solvents, , as well as different solid sorbents such as zeolites, activated carbon, porous silica materials, and metal–organic frameworks. , Optimizing process conditions such as temperature, pressure, and solvent composition can enhance the performance and economics of reactive separation for CO 2 capture. In addition, a better understanding of the mechanisms underlying reactive separations offers valuable insights into the fundamental principles .…”