The thermodynamic and kinetic characteristics of CO₂ adsorption of SBA-16 loaded with pentaethylenehexamine (PEHA) have been investigated using adsorption column system. The Langmuir isotherm model fitts the CO₂ adsorption isotherms well, and the average isosteric heat of adsorption is 59.6 kJ/mol, indicating that the CO₂ adsorption on PEHA-loaded SBA-16 is chemisorption. The Avrami fractional dynamics model is very suitable for illustrating the adsorption behaviour of CO₂ adsorption, and the results of kinetic analysis show that increasing the partial pressure of CO₂ or the working temperature is beneficial to the adsorption of CO₂. Three desorption methods were evaluatedto achieve the optimal desorption method. The results show that VTSA and steam stripping method are effective methods for industrial CO₂ desorption. Steam stripping may be more suitable for plants that already have low-cost steam. The activation energy E_a of CO₂ adsorption/desorption is calculated using Arrhenius equation. The activation energy E_a of CO₂ adsorption/desorption was calculated using the Arrhenius equation. The results show that the absolute value of E_a (adsorption) decreases with the increase of CO₂ partial pressure. In addition, the E_a value of vacuum rotary regeneration method and steam stripping method is smaller than the E_a value of temperature swing regeneration.

中文翻译：

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胺官能化吸附剂对CO2吸附/解吸的热力学和动力学研究

利用吸附柱系统研究了负载五亚乙基六胺（PEHA）的SBA-16对CO _2的吸附热力学和动力学特性。Langmuir等温线模型很好地拟合了CO ₂吸附等温线，平均等构吸附热为59.6 kJ / mol，表明PEHA负载SBA-16上的CO ₂吸附为化学吸附。Avrami分数动力学模型非常适合说明CO ₂的吸附行为，动力学分析结果表明，增加CO ₂的分压或工作温度有利于CO ₂的吸附。。对三种解吸方法进行了评估，以达到最佳解吸方法。结果表明，VTSA和汽提法是工业CO ₂解吸的有效方法。蒸汽汽提可能更适合已经具有低成本蒸汽的工厂。使用Arrhenius方程式计算CO ₂吸附/解吸的活化能E _a。使用Arrhenius方程式计算CO ₂吸附/解吸的活化能E _a。结果表明，E _a（吸附）的绝对值随CO ₂分压的增加而减小。另外，E _a真空旋转再生法和蒸汽汽提法_的值小于变温再生的E _a值。