The regeneration reaction characteristics of the K₂CO₃/Al₂O₃ sorbent were investigated with a thermogravimetric apparatus. The effects of the gas composition and temperature on the regeneration conversion and reaction rate were analysed extensively. The results of the thermogravimetric experiment revealed that the regeneration characteristics of K₂CO₃/Al₂O₃ are better than those of pure K₂CO₃ and that temperature is the key parameter for the K₂CO₃/Al₂O₃ regeneration process. It was also observed that the regeneration process of K₂CO₃/Al₂O₃ occurred in three stages. As the regeneration temperature increased, regeneration occurred in the following sequence: KHCO₃ on the external surface, KHCO₃ on the internal surface and KAl (CO₃)₂(OH)₂. The activation energy (E, kJ/mol) and pre‐index factor (A, min⁻¹) of the three stages were 69.7, 73.8 and 84.5 and 1.36 × 107, 1.86 × 107 and 2.74 × 106, respectively. The reaction kinetic parameters were calculated by the thermal analysis method. A comprehensive model based on the Avrami–Erofeev reaction mechanism model was proposed for the regeneration process of K₂CO₃/Al₂O₃. The model data and test values agreed well, thereby establishing the model's accuracy. This paper provides fundamental data for further study on the capture of carbon dioxide from flue gas using potassium‐based sorbents.

中文翻译：

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K2CO3 / Al2O3吸附剂的再生反应特性及机理模型

用热重分析仪研究了K ₂ CO ₃ / Al ₂ O ₃吸附剂的再生反应特性。广泛分析了气体组成和温度对再生转化率和反应速率的影响。热重实验结果表明，K ₂ CO ₃ / Al ₂ O ₃的再生特性优于纯K ₂ CO ₃，并且温度是K ₂ CO ₃ / Al ₂ O ₃的关键参数。再生过程。还观察到K ₂ CO ₃ / Al ₂ O ₃的再生过程发生在三个阶段。作为再生温度的提高，再生发生在以下序列：KHCO ₃在外部表面上，KHCO ₃的内表面上和KAL（CO ₃）₂（OH）₂。活化能（E，kJ / mol）和预折射率因子（A，min ^-1这三个阶段的）分别为69.7、73.8和84.5，以及1.36×107、1.86×107和2.74×106。通过热分析方法计算反应动力学参数。提出了基于Avrami-Erofeev反应机理模型的综合模型，用于K ₂ CO ₃ / Al ₂ O ₃的再生过程。模型数据和测试值吻合良好，从而确定了模型的准确性。本文为进一步研究使用钾基吸附剂从烟道气中捕集二氧化碳提供了基础数据。