Alumina Incorporation in Self-Supported Poly(ethylenimine) Sorbents for Direct Air Capture.

ABSTRACT: Self-supported branched poly(ethylenimine) scaffolds with ordered macropores are synthesized with and without Al₂O₃ powder additive by cross-linking poly(ethylenimine) (PEI) with poly(ethylene glycol) diglycidyl ether (PEGDGE) at -196 °C. The scaffolds' CO₂ uptake performance is compared with a conventional sorbent, i.e., PEI impregnated on an Al₂O₃ support. PEI scaffolds with Al₂O₃ additive show narrow pore size distribution and thinner pore walls than alumina-free materials, facilitating higher CO₂ uptake at conditions relevant to direct air capture. The PEI scaffold containing 6.5 wt % Al₂O₃ had the highest CO₂ uptake of 1.23 mmol/g of sorbent under 50% RH 400 ppm of

SUBMITTER: Narayanan P 

PROVIDER: S-EPMC10983007 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature