Exploring the Acid Gas Sorption Properties of Oxidatively Degraded Supported Amine Sorbents

Abstract

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Direct CO2 Capture from Air using Poly(ethylenimine)-Loaded Polymer/Silica Fiber Sorbents

“…The sample was initially heated at 110 °C for 2 h under He and then equilibrated at 35 °C for 1 h. Cycles of adsorption for 3 h at 35 °C and desorption for 2 h at 110 °C were then performed. He is used as a balance gas in the CO 2 adsorption measurements by TGA, because it is a nonadsorbing gas compared to CO 2 when using amines for CO 2 capture, and the use of a CO 2 /He mixture in the current study allows for comparison with similar amine-loaded materials reported in the literature. ,, …”

“…He is used as a balance gas in the CO 2 adsorption measurements by TGA, because it is a nonadsorbing gas compared to CO 2 when using amines for CO 2 capture, and the use of a CO 2 /He mixture in the current study allows for comparison with similar amine-loaded materials reported in the literature. 7,27,28 Column breakthrough experiments were performed on a custombuilt apparatus described elsewhere. 29 In brief, for a typical experiment, a module containing PEI-CA-SiO 2 monolithic fibers was wrapped in heat tape and dried at 90 °C for 30 min under a 20 sccm flow of dry N 2 and was then brought to the desired adsorption temperature.…”

Effect of Extended Aging and Oxidation on Linear Poly(propylenimine)-Mesoporous Silica Composites for CO2 Capture from Simulated Air and Flue Gas Streams

“…49−51 Typically, the oxidation of the amine polymers 52 produces less basic imine, amide, and other species, which are less effective CO 2 sorbents. Amine oxidation in solid sorbents has been widely studied by Sayari, 53−56 Jones, 57,58 and others, 51,59,60 with oxidation mitigation strategies including design of more oxidation-resistant sorbents 30,31,58,61,62 as well as adding stabilizers to the amine formulations. 46,59 For example, Min et al have used 1,2-epoxybutane and found that the PEI/SiO 2 composite retained about 92% of its working capacity after exposure in an O 2containing simulated flue gas (15% CO 2 ) mixture for 30 days at 110 °C.…”

“…In general, physical aging and oxidation are two factors that can drastically impact the physical properties and functionality of any polymeric materials. − Typically, the oxidation of the amine polymers produces less basic imine, amide, and other species, which are less effective CO 2 sorbents. Amine oxidation in solid sorbents has been widely studied by Sayari, − Jones, , and others, ,, with oxidation mitigation strategies including design of more oxidation-resistant sorbents ,,,, as well as adding stabilizers to the amine formulations. , For example, Min et al have used 1,2-epoxybutane and found that the PEI/SiO 2 composite retained about 92% of its working capacity after exposure in an O 2 -containing simulated flue gas (15% CO 2 ) mixture for 30 days at 110 °C . Srikanth and Chuang studied TEPA/SBA-15 composites and found that addition of poly­(ethylene glycol) (200 or 600 Da) improved the adsorption performance of the sorbents and the oxidative degradation resistance .…”

Recent advances in direct air capture by adsorption

“…Oxidative stability is a dominant factor that determines the lifetime of amine-functionalized adsorbents. The oxidative degradation of amine-loaded adsorbents principally results in the chemical instability of loaded amines, 105 producing new characteristic bonds including carbonyl (CQO), 134,254,[382][383][384][385] aliphatic CQC, 382 heterocyclic CQN, 134,[382][383][384] and aromatic CQC 382 owing to the formation of acid, amide, imide, and/or urea linkages. 134,254,[382][383][384][385][386] 13 C cross-polarization magic-angle spinning (CP-MAS) solid state NMR, 254,[381][382][383][384][385][386] XPS, 382 diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, 254,381,[383][384][385]387,388 and FT-Raman spectroscopy 254 are usually employed to examine the effect of oxidative treatments on solid adsorbents.…”