Browsing by Subject "Bicarbonate"

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Enhanced CO₂ capture and desorption using surface-active tertiary amine
(2024-05) Adekomi, Abdulmuiz Ajibola ; Okuno, Ryosuke, 1974-; Chun, Huh
In combating the critical challenge of escalating carbon emissions and their profound impact on climate change, amine-based CO₂ capture technologies have emerged as a pivotal approach towards carbon neutrality. Despite the progress in these technologies, identifying an efficient solvent for CO₂ capture remains critical for various Carbon Capture, Utilization, and Storage (CCUS) strategies towards the gigaton-scale CO₂ removal necessary to effectively mitigate greenhouse gas emissions. This study focuses on evaluating the effectiveness and efficiency of novel surface-active tertiary amine solvents for cyclic CO₂ capture as bicarbonate. The surface-active amine of focus was 3-(dimethylamino)propylamine (DMAPA), optimally modified with 6 propylene oxide (PO) groups. Results delineate a distinct CO₂ capture pathway utilizing surface active tertiary amine, which not only promotes bicarbonate generation but also enhances CO₂ solubilization. DMAPA-6PO exhibits 43% higher CO₂ capture capacity and 2.2 times greater bicarbonate generation compared to a tertiary amine without surface activity, ethylenediaminetetraacetic tetrasodium (EDTA-4Na). This enhancement is attributed to the surface activity, based on ¹³C Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared Spectroscopy (FTIR) analyses. The surface-active amine demonstrated a stable cyclic capacity, maintaining the CO₂ capture performance and bicarbonate concentration profiles over 900 minutes of testing cycles, substantiating its suitability for extended operational use. We also examined the cyclic capacity, regeneration efficiency, stability, and desorption heat requirement in comparison to those of commonly used commercial solvents. Notably, the surface-active amine showed a capture capacity regeneration efficiency that was 30% higher than that of monomethanolamine (MEA). Additionally, it exhibited a superior desorption rate, resulting in a substantial reduction of over 75% in heat requirements compared to both MEA and DMAPA. Overall, the findings demonstrate that DMAPA-6PO is a promising surface-active tertiary amine for capturing CO₂, offering significant advantages not only in the bicarbonate pathway but also across both conventional and innovative amine-based desorption processes.