The primary challenge hindering the widespread industrial adoption of amine-based CO 2 capture technology is the sluggish desorption rate of carbon dioxide (CO 2 ) and the substantial energy required in the regeneration phase. Despite considerable advancements aimed at reducing energy demands through novel amine solvents and process optimization, there remains a critical need for innovative solutions. This study introduces mesoporous silica nanoparticles KIT-6, along with super solid acid catalysts SO 4 2− /SnO 2 and SO 4 2− /ZrO 2 , to assess their impact on enhancing the desorption rate and reducing the energy consumption in the CO 2 capture process from rich monoethanolamine (MEA) at 96 °C. Our findings indicate that all the tested catalysts significantly expedite the regeneration process, reducing the energy required for regeneration up to 33.50 % and boosting the desorption rate by 150.25 % beyond what is achieved with MEA alone. KIT-6, in particular, displayed superior catalytic activity and energy efficiency in the desorption process. The catalysts SO 4 2− /ZrO 2 , SO 4 2− /SnO 2 , and KIT-6 improved the desorption rate by 20 %, 37.5 %, and 150.25 %, respectively, and cut down the energy required for regeneration by 11.10 %, 24.44 %, and 33.50 % respectively when compared to conventional aqueous MEA under the same conditions. Moreover, KIT-6 was subjected to ten cycles of CO 2 desorption testing to verify the cyclic robustness. A potential mechanism explaining the enhanced CO 2 capture facilitated by KIT-6 is also proposed within this work.
Yifu Li,Li'ao Wang,Zhongchao Tan,Zhien Zhang,Xinyue Hu
Absorption and desorption of CO 2 using K 2 CO 3 solutions promoted by three amino acid salts (AASs), potassium glycinate (PG), potassium lysinate (PL) and potassium L-argininate (PA), were evaluated using 40% CO 2 at 40 °C and with pure N 2 at 80 °C, respectively. The addition of all 3 AASs clearly enhanced both absorption and desorption of CO 2 compared to single K 2 CO 3 solution. PA + K 2 CO 3 solution showed the highest CO 2 cyclic capacity of 0.678 mol CO 2 /mol absorbent, while the highest CO 2 absorption and desorption rates of 39.8 and 17.6 mol CO 2 L −1 s −1 were achieved by PG + K 2 CO 3 solution. Finally, simulated biogas containing 40% of CO 2 and 60% of CH 4 was used as test gas in a hollow fiber membrane contactor. PG and PA promoters presented higher CO 2 absorption flux and removal efficiency than PL promoters in K 2 CO 3 solution within low Gas/Liquid ratio region. Stable CO 2 removal performances for all three promoters were observed at elevated temperature and pressure for 60 min operation.
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