This study examines the effect of a short term rotation on a system of constant volume. Adsorption of CO2 is performed on Activated Carbon (AC) at 281, 293 and 298 K with a special designed device that allows rotation. The adsorption isotherms were conducted up to 10 bar for both No Rotational (NoROT) and Rotational (ROT) cases. The ROT case refers to 60 s of rotation at 5000 rpm. The experimental results were fitted to Langmuir as well as to Dubinin–Astakhov (D–A) models with the latter presenting the best fit. A detailed thermodynamic analysis is performed in order to quantify the overall contribution of the rotation on gas adsorption compared to static case. For the ROT case, the maximum amount adsorbed (q max) is by 12 % higher than the NoROT counterpart, while a decrease in chemical potential as surface loading is increased, indicates that the process after rotation is entropy driven. The outcome of this work suggests that rotation enables gas molecules to access previously inaccessible sites, thus gaining more vacancies due to better rearrangement of the adsorbed CO2 molecules.

中文翻译：

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旋转对气体吸附影响的热力学分析

本研究考察了短期旋转对恒定体积系统的影响。吸附CO2个使用允许旋转的特殊设计设备在 281、293​​ 和 298 K 的活性炭 (AC) 上进行。对于无旋转 (NoROT) 和旋转 (ROT) 情况，吸附等温线最高可达 10 巴。ROT 案例是指以 5000 rpm 的速度旋转 60 秒。实验结果适用于 Langmuir 以及 Dubinin-Astakhov (D-A) 模型，后者表现出最佳拟合。进行了详细的热力学分析，以量化与静态情况相比旋转对气体吸附的总体贡献。对于 ROT 情况，最大吸附量（q 最大限度) 比 NoROT 对应物高 12%，而化学势随着表面负载的增加而降低，表明旋转后的过程是熵驱动的。这项工作的结果表明，旋转使气体分子能够进入以前无法进入的位置，从而由​​于吸附的 CO 的更好重排而获得更多空位2个分子。