In the previous work, YBaCo₄O_7 + δ and Y_0.2Ti_0.05Dy_0.75BaCo₄O_7 + δ monolithic oxygen carriers worked at low temperature, were reported with good reactivity in oxygen absorption and desorption. Oxygen carriers reacted at low temperature can save amount of energy for the chemical looping air separation process. The objective of this work is to explore the detailed effect of new foreign ion K⁺ on reaction process of oxygen releasing and the reduction kinetics for YBaCo₄O_7 + δ and Y_0.2Ti_0.05Dy_0.75BaCo₄O_7 + δ monolithic oxygen carriers in fixed-bed reactor. The results showed that introducing K⁺ can improve the reaction rate of oxygen releasing. The process of oxygen releasing can be described by A model with different model exponentials of 2, 3, and 4. Adding K⁺ promotes reaction of oxygen releasing. The apparent activation energies and pre-exponential factor of oxygen releasing process range from 23.11 to 29.72 kJ/mol and 12.46 to 29.73 min⁻¹, respectively. The kinetic model of oxygen releasing process of monolithic oxygen carriers is established based on obtained kinetics parameters. The got kinetics parameters could be used for designing of a chemical looping air separation reactor.

中文翻译：

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外来离子K对化学循环空分过程中氧载体还原动力学的影响

在以往的工作中，报道了YBaCo ₄ O _{7 + δ}和Y _0.2 Ti _0.05 Dy _0.75 BaCo ₄ O _{7 + δ}整体式氧载体在低温下工作，具有良好的吸氧和解吸反应性。在低温下反应的氧载体可以为化学循环空气分离过程节省大量能量。这项工作的目的在于探索新的外来离子K的详细效果⁺对氧的反应过程中释放和用于YBaCo还原动力学₄ ö _{7 +δ}和Y _0.2的Ti _0.05镝_0.75 BACO固定床反应器中的₄ O _{7 + δ}整体式氧载体。结果表明，引入K ⁺可以提高放氧反应速率。放氧过程可以用A模型来描述，模型指数为2、3、4。添加K ⁺促进放氧反应。释氧过程的表观活化能和指前因子分别为23.11～29.72 kJ/mol和12.46～29.73 min ^-1。根据获得的动力学参数，建立了整体式载氧体释氧过程的动力学模型。得到的动力学参数可用于化学循环空气分离反应器的设计。