CO₂ Capture by Polyethylenimine-Modified Fibrous Adsorbent

Abstract

This work focuses on developing a novel adsorbent for CO2 capture, by coating polyethylenimine (PEI) on glass fiber matrix and using epichlorohydrin (ECH) as cross-linking agent. The physicochemical properties of the fibrous adsorbent were characterized. The CO2 adsorption capacity was evaluated. Factors that affect the adsorption capacity of the fibrous adsorbent were studied. The experimental results show that this fibrous PEI adsorbent exhibits a much higher adsorption capacity for CO2 compared with another PEI fiber prepared in our previous work, which employed epoxy resin as the cross-linking agent. A CO2 adsorption capacity as high as 4.12 mmol CO2/g of adsorbent was obtained for this fibrous PEI adsorbent at 30 degrees C, equal to 13.56 mmol CO2/g of PEI, with a PEI/ECH ratio of 20:1. The adsorbent can be completely regenerated at 120 degrees C.

Adsorbent Materials for Carbon Dioxide Capture from Large Anthropogenic Point Sources

“…Chen [249] observed the degradation onset of PEI and ECH copolymers coated on glass fibers around 473 K, which is consistent with what was observed for PEI impregnated or functionalized silicas (see section 3.4). Pis [244] observed the decom-position of carbons impregnated with DETA, PEHA, and PEI at 373, 503, and 543 K, respectively, which correlated roughly with increasing molecular weight and boiling point.…”

“…The copper sites bound to added PEI, which was then crosslinked with glutaraldehyde ( Figure 39 The second strategy employed to create polymeric amine adsorbents is to synthesize copolymers with amine-containing monomers or monomers that are easily derivatized to incorporate amines. Chen [249] reported the synthesis of a cross-linked copolymer of PEI and epichlorohydrin (ECH, Figure 39) that was coated onto commercial glass fibers with high surface areas. Coating layer weight percentages of 31 to 76 % (% of the total weight of adsorbent) were used to prepare the composites.…”

“…Transition from the Henry's Law regime occurred around a partial pressure of 6 mm Hg, but saturation had not yet occurred at 11 mm Hg. Chen [249] also measured humid isotherms for PEI and ECH copolymers coated onto glass fibers by GC, and determined that at CO 2 feed concentrations above 12 % CO 2 , the adsorbent was in the saturation region ( Figure 54). Pis [244] used TGA to find dry isotherms for DETA, PEHA, and PEI impregnated activated carbon as well as the bare support at 273 K for a CO 2 partial pressure range of 0 to 0.035 bar (Figure 55).…”

Metal Monolithic Amine-grafted Zeolite for CO{sub 2} Capture

“…The inset shows the corresponding CO 2 uptake profile, which adsorption half time (τ 0.5 ) was determined to be 0.28 min (16.8 s). Small adsorption half time suggests rapid kinetics of CO 2 adsorption 53,[55][56][57] which allows high utilization of the sorbent. 2 .…”

“…intensities after the injections indicates the removal of -NH-functional group from the sorbent. 53,56,58 The strong increase of absorbance intensity in 3200 to 2800 cm The absorbance spectra over TEPA/SiO 2 after the second HCl is re-plotted and compared with the absorbance spectra during the CO 2 adsorption after each HCl injection in Figure 4-30. The single beam spectrum prior to each CO 2 adsorption was used as the background.…”