The SF₆ adsorption isotherms on zeolite 13X, zeolite NaY, activated carbon, and silica gel were investigated over a temperature range of 298–358 K and at pressure from 0 to 1000 kPa. Experimental results demonstrated that the adsorption capacity of SF₆ was in the order AC > NaY > 13X > silica gel under the same adsorption pressure and temperature conditions. Moreover, the equilibrium isotherm data of SF₆ on different adsorbents were fitted with Langmuir, Langmuir–Freundlich, and Toth models. The agreement between the fitting isotherms and the experimental data increased with the increase of available fitting parameters in the equation of the isotherm model, and the Toth model was verified to be the best alternative for describing adsorption behaviors of SF₆. Furthermore, the isosteric heats of adsorption of SF₆ on adsorbents were calculated by the Clausius–Clapeyron equation. Heats of adsorption of SF₆ on the four adsorbents first decreased and then increased with increasing SF₆ loading.

中文翻译：

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SF ₆在NaY，13X沸石，活性炭和硅胶上的吸附性能

在298–358 K的温度范围和0至1000 kPa的压力下，研究了SF ₆在13X沸石，NaY沸石，活性炭和硅胶上的吸附等温线。实验结果表明，在相同的吸附压力和温度条件下，SF ₆的吸附能力为AC> NaY> 13X>硅胶。此外，用Langmuir，Langmuir-Freundlich和Toth模型拟合了不同吸附剂上SF ₆的平衡等温线数据。拟合等温线与实验数据之间的一致性随着等温线模型方程中可用拟合参数的增加而增加，并且证明了Toth模型是描述SF吸附行为的最佳替代方法₆。此外，通过克劳修斯-克拉珀龙方程计算了SF ₆在吸附剂上的等规吸附热。SF ₆在四种吸附剂上的吸附热首先随着SF ₆负载的增加而降低，然后增加。