Issue 3, 2023

Investigation of storage environments on aminopolymer stabilization within UiO-67(Zr) for CO2 capture

Abstract

Aminopolymers, poly(ethylene imine) (PEI) and poly(propylene imine) (PPI), are supported within nanoporous UiO-67(Zr) and evaluated for CO2 capture from simulated flue gas (10% CO2) and air (400 ppm CO2). N2 physisorption and Fourier-transform infrared spectroscopy indicate that PEI and PPI are physisorbed in UiO-67(Zr) voids but not tethered to metal nodes or carboxylate backbones. Mass-normalized CO2 capacity increases with repeated CO2 uptake-regeneration cycles for 30–50 wt% PPI, suggesting CO2 diffusion limitations at these higher loadings. 20 wt% PPI/UiO-67(Zr) and 20 wt% PEI/UiO-67(Zr) exposed to ambient air for 7 days demonstrate higher oxidative degradation in PEI than PPI, though PEI oxidation is reduced when stabilized within UiO-67(Zr) relative to when unconfined. Exposure of composites to liquid storage environments of varying polarity, hydrogen-bonding capability, and size indicate that 20 wt% PPI/UiO-67(Zr) amine efficiencies are minimally affected by solvent-induced aminopolymer conformational changes. Conversely, 20 wt% PEI/UiO-67(Zr) is more sensitive to surrounding solvent environments, exhibiting the greatest amine efficiency in methanol and the lowest in acetone due to solvent-induced aminopolymer swelling and reaction, respectively. Overall, this work provides insight into CO2 capture efficacies and chemical stabilities of composite PEI and PPI materials under various storage environments to inform future adsorbent and system design.

Graphical abstract: Investigation of storage environments on aminopolymer stabilization within UiO-67(Zr) for CO2 capture

Supplementary files

Article information

Article type
Paper
Submitted
06 nov 2022
Accepted
26 dec 2022
First published
10 jan 2023
This article is Open Access
Creative Commons BY license

Mater. Adv., 2023,4, 901-909

Investigation of storage environments on aminopolymer stabilization within UiO-67(Zr) for CO2 capture

R. A. Yang, D. R. Ganza, M. R. Smith, S. Cho, J. A. Vandermel, E. Jiang and M. L. Sarazen, Mater. Adv., 2023, 4, 901 DOI: 10.1039/D2MA01020H

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