This work presents a proposal for enhancing CO₂ capture over lithium cuprate (Li₂CuO₂) by alkaline carbonates addition. Lithium cuprate was synthesized via solid-state reaction. Subsequently, portions of Li₂CuO₂ were mechanically mixed with 10 wt% of potassium carbonate (K₂CO₃), sodium carbonate (Na₂CO₃) or equal amounts of both carbonates (5–5 wt%). All samples were characterized by several techniques and then CO₂ chemisorption process was evaluated on different dynamic and isothermal conditions. The presence of K and/or Na carbonates preserves the primary properties of pristine Li₂CuO₂, such as crystalline phase (DRX) and microstructure (SEM), also allowing to increase textural properties (N₂ physisorption) and modifying CO₂ desorption abilities (TPD), in comparison with pure material. In general, carbonates addition induces some changes during CO₂ chemisorption, depending on the type of carbonate used. On the isothermal tests, it was observed that between 400 and 600 °C the sample containing both carbonates presented the best capture performance, capturing between 25.7 and 31.8 wt% of CO₂ (63.9–79.1% of efficiency). On the other hand, at 700 °C, Na-Li₂CuO₂ sample presented the best capture ability, capturing 30.6 wt% of CO₂ (76.1% of efficiency). Meanwhile at 650 °C, K-Li₂CuO₂ presented the highest sorption capacity with 40.4 wt% of CO₂ captured, which represents ∼100% of efficiency. The above results showed that in the same thermal conditions, samples modified with alkaline carbonates improved the CO₂ capture process. This enhancement was attributed to the formation of eutectic phases (observed in DSC analysis) between sodium and potassium carbonates added mechanically and lithium carbonate (Li₂CO₃) formed as result of CO₂ chemisorption process. Finally, it was observed that carbonate addition is a feasible way to increase CO₂ capture in Li₂CuO₂ material by means of eutectic phase formation.

这项工作提出了通过添加碱性碳酸盐来增强铜酸锂（Li ₂ CuO ₂）上的CO ₂捕集的建议。通过固相反应合成铜酸锂。随后，将部分Li ₂ CuO ₂与10 wt％的碳酸钾（K ₂ CO ₃），碳酸钠（Na ₂ CO ₃）或等量的两种碳酸盐（5-5 wt％）机械混合。所有样品均通过多种技术进行表征，然后再进行CO ₂表征。在不同的动态和等温条件下评估化学吸附过程。碳酸钾和/或碳酸钠的存在保留了原始的Li ₂ CuO ₂的主要性质，例如晶相（DRX）和微观结构（SEM），还可以提高织构性质（N ₂物理吸附）并改变CO _2的解吸能力（TPD），与纯材料相比。通常，根据所用碳酸盐的类型，碳酸盐的添加会在CO ₂化学吸附过程中引起一些变化。在等温测试中，观察到在400至600°C的温度下，含有两种碳酸盐的样品表现出最佳的捕获性能，捕获25.7至31.8 wt％的CO ₂（效率的63.9–79.1％）。另一方面，在700°C下，Na-Li ₂ CuO ₂样品表现出最佳的捕获能力，捕获了30.6 wt％的CO ₂（效率的76.1％）。同时，在650°C时，K-Li ₂ CuO ₂表现出最高的吸附容量，捕获到40.4 wt％的CO ₂，约占效率的100％。以上结果表明，在相同的热条件下，用碱性碳酸盐改性的样品可以改善CO _2的捕集过程。这种增强归因于在机械添加的碳酸钠和碳酸钾与碳酸锂（Li ₂ CO ₃）之间形成了共晶相（在DSC分析中观察到）。）是由于CO ₂化学吸附过程而形成的。最后，观察到添加碳酸盐是通过共晶相形成来增加Li ₂ CuO ₂材料中CO ₂捕获的可行方法。