Sodium cobaltate and some Fe-containing samples were evaluated on the CO, CO₂ and CO–CO₂ sorption at high temperatures and low CO₂ partial pressures, in the presence and absence of oxygen. Initially, CO₂ chemisorption on these samples was analyzed using different P_CO2. Results indicated that all the samples were able to chemisorb CO₂ (if P_CO2 ≥ 0.2), where Fe-containing NaCoO₂ samples clearly showed higher CO₂ chemisorption efficiencies than pristine NaCoO₂. These results were explained by the partial iron reduction and the consequent oxygen release. When oxygen was added the chemisorption process was improved as a result of an iron reduction–oxidation mechanism. These results were confirmed kinetically by the Jander-Zhang and Eyring models. The temperature for complete CO catalytic conversion was shifted to lower temperatures as a function of iron content. Finally, simultaneous CO₂ and CO sorption as well as catalytic experiments were tested (in absence or presence of O₂). These results showed that CO was mainly oxidized and chemically captured, over the CO₂ direct capture, in oxygen absence and presence. Iron is able to release and capture oxygen by reduction–oxidation effect and facilitates oxygen dissociation for the carbonation process, through the Mars van Krevelen reaction mechanism.

中文翻译：

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不同分压下钴酸钠的CO 2 -CO捕获及动力学分析

在有氧和无氧条件下，在高温和低CO ₂分压下，对钴酸钠和一些含铁样品的CO，CO ₂和CO-CO ₂吸附进行了评估。最初，使用不同的P _CO2分析这些样品上的CO ₂化学吸附。结果表明，所有的样品都能够化学吸附CO ₂（如果P _CO2  ≥0.2），含Fe NaCoO其中_2个样品清楚地表明较高的CO ₂比原始NaCoO化学吸附效率₂。这些结果可以通过部分还原铁和随后释放的氧气来解释。当添加氧气时，由于铁的还原-氧化机制，化学吸附过程得到了改善。这些结果在动力学上由Jander-Zhang和Eyring模型确认。完全CO催化转化的温度根据铁含量而移至较低温度。最后，测试了同时进行的CO ₂和CO吸附以及催化实验（在不存在或存在O _2的情况下）。这些结果表明，CO在CO ₂之上主要被氧化和化学捕获。在没有氧气存在的情况下直接捕获。铁能够通过Mars van Krevelen反应机制通过还原-氧化作用释放和捕获氧气，并促进碳酸分解过程中的氧气离解。