Sodium cobaltates containing Fe, Cu or Ni were synthesized, characterized and evaluated for CO₂ capture at high temperatures. Initially, NaCoO₂ and metal-containing samples were characterized by XRD, XPS, SEM and N₂ adsorption-desorption, where it was probed that Fe, Cu and Ni were partially incorporated into the NaCoO₂ structure. All these ceramics were able to trap CO₂, but only Fe-containing sample presented an important CO₂ chemisorption improvement in comparison to the pristine NaCoO₂ sample. Based on these results, a second set of samples was prepared and characterized, varying the iron concentration (10, 20 and 30 mol%). Results showed that CO₂ chemisorption was improved by iron addition up to 20 mol%, but higher amounts of iron did not continue enhancing the chemisorption process. Afterwards, the gas flow was modified adding oxygen (P_CO2 = 0.95 and P_O2 = 0.05), resulting in higher CO₂ chemisorption efficiencies and kinetics. These analyses were complemented by CO₂ cyclic experiments, where different gas flows were used, analyzing thermal stability and efficiency evolution.

合成了含有Fe，Cu或Ni的钴酸钠，对其进行了表征并评估了其在高温下的CO ₂捕集率。最初，通过XRD，XPS，SEM和N ₂吸附-脱附对NaCoO ₂和含金属的样品进行表征，其中检测到Fe，Cu和Ni被部分掺入NaCoO ₂结构中。所有这些陶瓷都能够捕获CO ₂，但是与原始NaCoO ₂样品相比，仅含Fe的样品显示出重要的CO ₂化学吸附改进。基于这些结果，制备并表征了第二组样品，改变了铁的浓度（10、20和30 mol％）。结果表明，CO通过添加高达20 mol％的铁可以改善_2的化学吸附，但是更高含量的铁并不能继续增强化学吸附过程。之后，修改气流以添加氧气（P _CO2  = 0.95和P _O2  = 0.05），从而提高了CO _2的化学吸附效率和动力学。这些分析辅以CO ₂循环实验，其中使用了不同的气体流量，分析了热稳定性和效率演变。