Momeni Arash, McQuillan Rebecca V, Anisi Hossein, Alivand Masood S, Zavabeti Ali, Stevens Geoffrey W, Kim Seungju, Mumford Kathryn A
Department of Chemical Engineering, The University of Melbourne, Parkville, VIC, 3010, Australia.
Department of Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia.
Small. 2025 Jun;21(25):e2503023. doi: 10.1002/smll.202503023. Epub 2025 Apr 27.
Liquid-based CO direct air capture (DAC) is a pivotal technology for mitigating climate change. Energy-intensive CO desorption, high regeneration temperatures, and solvent degradation are key challenges. Here, low-temperature catalytic membrane vacuum regeneration (C-MVR) as a promising approach for sustainable and energy-efficient DAC is developed and evaluated. Noncatalytic experiments are conducted using three commercial membrane modules and four green amino acid salts under varying conditions (e.g., temperatures and flowrates). Based on CO transfer rates, ultra-thin dense composite membranes and aqueous potassium taurinate (TauK) are the most promising for MVR in DAC applications. For C-MVR trials, commercial ion-exchange resin improves CO desorption fluxes by up to 64.4% and reduces thermal energy requirements by up to 39.1%. TauK demonstrates the highest CO flux and lowest thermal energy consumption. Parametric analysis of catalyst performance for varying temperatures, catalyst amount, and solvent concentrations is also performed. To minimize any potential precipitation in TauK, potassium carbonate (KCO) is added, showing minimal impact on CO desorption kinetics and catalyst improvement. The findings of this study highlight the practical applicability of C-MVR using green amino acid salts as a sustainable approach to boost CO desorption rate and reduce thermal energy input.
基于液体的一氧化碳直接空气捕获（DAC）是缓解气候变化的一项关键技术。能源密集型的一氧化碳解吸、高再生温度和溶剂降解是主要挑战。在此，开发并评估了低温催化膜真空再生（C-MVR），这是一种用于可持续且节能的DAC的有前景的方法。使用三个商业膜组件和四种绿色氨基酸盐在不同条件（如温度和流速）下进行了非催化实验。基于一氧化碳传输速率，超薄致密复合膜和牛磺酸钾水溶液（TauK）在DAC应用的MVR中最具前景。对于C-MVR试验，商业离子交换树脂可将一氧化碳解吸通量提高多达64.4%，并将热能需求降低多达39.1%。TauK表现出最高的一氧化碳通量和最低的热能消耗。还对不同温度、催化剂量和溶剂浓度下的催化剂性能进行了参数分析。为了使TauK中任何潜在的沉淀最小化，添加了碳酸钾（KCO），结果表明其对一氧化碳解吸动力学和催化剂改进的影响最小。本研究结果突出了使用绿色氨基酸盐的C-MVR作为提高一氧化碳解吸速率和减少热能输入的可持续方法的实际适用性。
