Dataset Information

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 CO₂ conditions. In situ DRIFT spectroscopy and temperature-programmed desorption experiments show a significant CO₂ uptake contribution via physisorption as well as carbamic acid formation, with lower CO₂ binding energies in PEI scaffolds relative to conventional PEI sorbents, likely a result of a lower population of primary amines due to the amine cross-linking reactions during scaffold synthesis. The PEI scaffold containing 6.5 wt % Al₂O₃ is estimated to have the lowest desorption energy penalty under humid conditions, 4.6 GJ/t_CO2, among the sorbents studied.

SUBMITTER: Narayanan P

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

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

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

Narayanan Pavithra P Guntupalli Pranav P Lively Ryan P RP Jones Christopher W CW

Chem & bio engineering 20240220 2

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 distri ...[more]

PMID: 38566966

Similar Datasets

Project description:Rising CO2 emissions are responsible for increasing global temperatures causing climate change. Significant efforts are underway to develop amine-based sorbents to directly capture CO2 from air (called direct air capture (DAC)) to combat the effects of climate change. However, the sorbents' performances have usually been evaluated at ambient temperatures (25 °C) or higher, most often under dry conditions. A significant portion of the natural environment where DAC plants can be deployed experiences temperatures below 25 °C, and ambient air always contains some humidity. In this study, we assess the CO2 adsorption behavior of amine (poly(ethyleneimine) (PEI) and tetraethylenepentamine (TEPA)) impregnated into porous alumina at ambient (25 °C) and cold temperatures (-20 °C) under dry and humid conditions. CO2 adsorption capacities at 25 °C and 400 ppm CO2 are highest for 40 wt% TEPA-incorporated γ-Al2O3 samples (1.8 mmol CO2/g sorbent), while 40 wt % PEI-impregnated γ-Al2O3 samples exhibit moderate uptakes (0.9 mmol g-1). CO2 capacities for both PEI- and TEPA-incorporated γ-Al2O3 samples decrease with decreasing amine content and temperatures. The 40 and 20 wt % TEPA sorbents show the best performance at -20 °C under dry conditions (1.6 and 1.1 mmol g-1, respectively). Both the TEPA samples also exhibit stable and high working capacities (0.9 and 1.2 mmol g-1) across 10 cycles of adsorption-desorption (adsorption at -20 °C and desorption conducted at 60 °C). Introducing moisture (70% RH at -20 and 25 °C) improves the CO2 capacity of the amine-impregnated sorbents at both temperatures. The 40 wt% PEI, 40 wt % TEPA, and 20 wt% TEPA samples show good CO2 uptakes at both temperatures. The results presented here indicate that γ-Al2O3 impregnated with PEI and TEPA are potential materials for DAC at ambient and cold conditions, with further opportunities to optimize these materials for the scalable deployment of DAC plants at different environmental conditions.

Dataset Information

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

Publications

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

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets