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Kinetic study and modeling on the regeneration of Li4SiO4-based sorbents for high-temperature CO2 capture
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2021-08-06 , DOI: 10.1016/j.fuproc.2021.106976
Shuzhen Chen , Changlei Qin , Weiyang Yuan , Dawid P. Hanak , Jingyu Ran

Li4SiO4 is acknowledged as a promising sorbent candidate in high-temperature CO2 adsorption. However, reaction kinetics for the regeneration process of Li4SiO4, especially its dependence on CO2 pressure is lack of understanding. This work designed and carried out a series of isothermal tests on the regeneration of pure Li4SiO4 and K-Li4SiO4 under CO2 partial pressure of 0–0.5 atm and temperature of 625–725 °C. For the first time, the expression of (Peq − PCO2)n is introduced into the regeneration rate equation so as to reveal its dependence on CO2 pressure. The reaction order (n) is found to grade according to the value of (Peq − PCO2), and the apparent activation energy is calculated as 284.42 kJ•mol−1 and 146.31 kJ•mol−1 for the regeneration of Li4SiO4 and K-Li4SiO4, respectively. Furthermore, this work proposes that power law model with m = 4/3 is the most probable mechanism function for the regeneration of Li4SiO4-based sorbents.



中文翻译:

用于高温 CO2 捕集的 Li4SiO4 基吸附剂的再生动力学研究和建模

Li 4 SiO 4被公认为高温CO 2吸附的有前途的候选吸附剂。然而,Li 4 SiO 4再生过程的反应动力学,尤其是其对CO 2压力的依赖性尚不清楚。本工作设计并进行了一系列等温试验,对纯Li 4 SiO 4和K-Li 4 SiO 4在CO 2分压为0-0.5 atm、温度为625-725 °C的条件下进行再生。第一次, ( P eq  −  P CO 2 )的表达式n被引入到再生速率方程中以揭示其对CO 2压力的依赖性。根据( P eq  -  P CO 2 )的值发现反应级数( n ),计算表观活化能为284.42 kJ•mol -1和146.31 kJ•mol -1再生锂4 SiO 4和K-Li 4 SiO 4。此外,这项工作提出m  = 4/3 的幂律模型是 Li 4 SiO 4再生的最可能机制函数- 吸附剂。

更新日期:2021-08-07
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