Novel Polyethylenimine-Modified Mesoporous Molecular Sieve of MCM-41 Type as High-Capacity Adsorbent for CO₂ Capture

Abstract

The objective of the work presented here is to develop a nanoporous solid adsorbent which can serve as a "molecular basket" for CO 2 in the condensed form. Polyethylenimine (PEI)-modified mesoporous molecular sieve of MCM-41 type (MCM-41-PEI) has been prepared and tested as a CO 2 adsorbent. The physical properties of the adsorbents were characterized by X-ray powder diffraction (XRD), N 2 adsorption/desorption, and thermogravimetric analysis (TGA). The characterizations indicated that the structure of the MCM-41 was preserved after loading the PEI, and the PEI was uniformly dispersed into the channels of the molecular sieve. The CO 2 adsorption/desorption performance was tested in a flow system using a microbalance to track the weight change. The mesoporous molecular sieve had a synergetic effect on the adsorption of CO 2 by PEI. A CO 2 adsorption capacity as high as 215 mg-CO 2 /g-PEI was obtained with MCM-41-PEI-50 at 75 °C, which is 24 times higher than that of the MCM-41 and is even 2 times that of the pure PEI. With an increase in the CO 2 concentration in the CO 2 /N 2 gas mixture, the CO 2 adsorption capacity increased. The cyclic adsorption/desorption operation indicated that the performance of the adsorbent was stable.

CO2 Capture Behaviors of Amine-Modified Resorcinol-Based Carbon Aerogels Adsorbents

“…When PEI loadings are further raised, PEI will be coated on the external surface of activated CAs, resulting in channels blockage. Therefore, the adsorption capacities decrease (Xu et al, 2002;Xu et al, 2003;Chen et al, 2010).…”

Selective strategy for solid sorbent replacement in CCS

“…Sorbent name N γ ′ , % cy Notes (Zhang et al, 2014b) 40% PEI-silica 24 − 1.4 dry; BTC 57 0.0 moist; BTC (Franchi et al, 2005) 6.98DEA/PE-MCM 7 − 0.6 " " MCM-41-PEI50 7 − 1.0 (Xu et al, 2002) " " Zeolite 13X 5 0.0 regene-350 • C " " 6 − 7.1 rate at: 75 • C (Zhao et al, 2013a) 10 0.0 dual fluid. beds (Zhao et al, 2013b) PEI600-Q10 10 − 0.9 " " PEI1200-Q10 10 0.0 " " PEI800-Q10 10 0.0 " " TEPA-Q10 10 0.0 (Sayari et al, 2012) pMono-50/130 31 − 1.6 dry " " sMono-1-50/130 31 0.0 dry " " Diamine-50/130 31 − 1.8 dry; nonlinear " " DiSamine-50/130 31 − 1.8 " " " "…”

Development of Fly Ash Derived Sorbents to Capture CO2 from Flue Gas of Power Plants

“…Alcohol amines have previously been used to impart an amine functionality to activated carbons, and therefore, to enhance their CO 2 capacity (Zinnen et al, 1989). Furthermore, it has been found polyetherimine (PEI) can significantly increase the CO 2 adsorption of molecular sieve materials MCM-41 (Xu et al, 2002). Therefore, all the above compounds were used to modify the activated carbons produced from fly ash.…”