Schlagwort: DACCS

Mengru Sun, Meng Zhao, Leyu Zhao, Qiang Wang, Jinzhu Ma, Hong He  IN: Environmental Functional Materials, https://doi.org/10.1016/j.efmat.2025.02.003

Amine-functionalized MOFs significantly enhance CO₂ adsorption, yet most studies focus on adsorption capacity, with limited research on the impacts of water vapor and oxidative stability in practical DAC applications. Herein, MIL-100(Cr) was modified with polyethyleneimine (PEI), tetraethylenepentamine (TEPA), and diethanolamine (DEA) via impregnation, and their CO₂ capture performance under DAC conditions was systematically evaluated, including adsorption capacity, cyclic stability, water resistance, and oxidative stability.

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Rongrong Zheng, Mengyao Jiang, Yanfang Fan IN: Chemical Engineering Journal, https://doi.org/10.1016/j.cej.2025.161078

Herein, the authors demonstrate a flexible membrane solid amine adsorbent based on cellulose acetate/silica composite supports that is fabricated into a spiral wound module functioning as a gas–solid contactor, presenting reduced pressure drop and comparable adsorption capacities with powdery solid amine materials. First, the phase inversion method is utilized to prepare cellulose acetate/silica membrane support, where the doping amount of silic varies from 60 wt% to 80 wt%. After assembling the support into a spiral module, poly (ethyleneimine) (PEI) is loaded in the module via an in-situ amine impregnation method, that the amine solution flows into the module which could reduce the support mass loss encountered in the conventional static impregnation method.

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Howoun Jung, Kyunam Kim, Jinhong Jeong, Aqil Jamal, Dong-Yeun Koh, Jay H. Lee IN: Chemical Engineering Journal, https://doi.org/10.1016/j.cej.2025.160840

This study delves into the impact of such environmental variations, focusing specifically on the energy consumption and productivity of DAC processes under daily and hourly fluctuating air conditions. Dynamic simulations coupled with the optimization of operating parameters were employed to investigate these effects. Bayesian optimization was utilized to refine the parameters for optimal DAC performance efficiently. 

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Erick O. Arwa, Kristen R. Schell IN: Applied Energy, https://doi.org/10.1016/j.apenergy.2025.125549

However, existing capacity expansion studies that model DAC assume that it has a constant capture rate, ignoring the ambient environmental conditions that are known to affect the DAC capture rate as well as geographical location. Furthermore, there are currently no studies that endogenously model DAC flexibility, especially the value of load-shifting in such a large-scale industrial process in capacity expansion optimization. This study develops a capacity expansion optimization model that integrates more realistic data on DAC’s response to ambient environmental conditions as well as DAC process flexibility.

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Nitesh Kumar, Vyacheslav S. Bryantsev, Santanu Roy IN: Journal of the American Chemical Society, https://doi.org/10.1021/jacs.4c14612

Direct air capture (DAC) technologies are limited by the poor understanding of the dynamic role of interfaces in modulating the chemisorption of CO₂ from air into solutions. While the reactivity of aqueous amine-based solvents in the bulk environment is strongly inhibited by nonequilibrium solvent effects, promoting DAC at interfaces posits a possibility to reduce the coupling with the solvent and significantly accelerate DAC. Building on an experimentally proven concept to bring an anionic glycine absorbent to the interface through ion-pairing interactions with a positively charged surfactant, the authors establish the fundamental time scales for key elementary steps involved in DAC with rate theory and enhanced-sampling ab initio molecular dynamics simulations. The authors elucidate the mechanism by which water influences the free energy barriers and dynamical crossing-recrossing of those barriers, affecting the reaction rates.

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