Abstract In this work, a yellow tuff has been proposed for the first time as sorbent for CO2 capture. Dynamic breakthrough experiments have been performed in a fixed bed reactor at different temperatures (25–150 °C) and CO2 partial pressures (0.01–0.20 atm), focusing on the process thermodynamics and kinetics. The thermodynamic and kinetic studies highlighted that the CO2 adsorption on the tuff in the low pressure region typical of combustion flue gases can be properly described by Freundlich's isotherm model and by the pseudo-first order kinetic model, respectively, thus indicating a physical, multilayer and heterogeneous surface binding mechanism. Based on the results obtained, it has been demonstrated that, in the framework of a real application for post-combustion CO2 capture, the natural tuff, i.e. a low-cost natural sorbent, could be more conveniently employed in vacuum swing or mixed mode in order to minimize the energy penalty of the process.

中文翻译：

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受热力学和动力学影响的固定床吸附：用于 CO2 捕获的黄色凝灰岩

摘要 在这项工作中，首次提出黄色凝灰岩作为 CO2 捕集的吸附剂。已在固定床反应器中在不同温度 (25–150 °C) 和 CO2 分压 (0.01–0.20 atm) 下进行动态突破实验，重点研究过程热力学和动力学。热力学和动力学研究强调，在典型的燃烧烟道气低压区凝灰岩上的 CO2 吸附可以分别用 Freundlich 等温线模型和拟一级动力学模型恰当地描述，从而表明物理、多层和异质表面结合机制。根据获得的结果，已经证明，在燃烧后 CO2 捕集的实际应用框架中，天然凝灰岩，即低成本的天然吸附剂，