Experimental kinetic data on the adsorption and desorption of water vapors on molybdenum disulfide in relative humidity ranges of the gas phase from zero to 100% are presented. Microsized layered molybdenum disulfide powders (manufactured by Climax Molybdenum Co., USA) were used in the experiment. The adsorption–desorption kinetics of water vapors was studied by the gravimetric method. In the continuous automatic mode, the weight changes in the test sample and the process rate were recorded. An air stream with a relative humidity of 100% was used for water vapor adsorption. Desorption was studied under decrease in the partial pressure of air flow water vapors to 55% of the relative humidity in isothermal and nonisothermal conditions (temperature increase and decrease in the range 20–130°C). The time dependence of the adsorptive process of water vapors in a flowing system with 100% humidity of the gas phase is close to parabolic. The dependence of adsorption on water vapor pressure (V = f(P i ) is S-shaped with the bend point in the region of transition to condensation-induced filling of absorption volumes. The desorption rate exceeds the adsorption rate. The adsorption potential theory of Polanyi, Dubinin, and Radushkevich was used to assess the bonding energy between the water molecules and nonuniform MoS 2 porous structure. The change in the adsorptive forces and the Pi/Ps ratio depending on the change in adsorbate volume were characterized. Adsorption isotherms for water vapors were plotted at 30 and 50°C. The graphical integration method was applied to determine the differential rate of forming the water adsorption volumes (dV i ) at water partial pressures 0 < P i < 5 kPa. The kinetic features of the stepwise process are shown to depend on the potential energy of interaction between the adsorbed volumes and adsorbent. The nature of the adsorption process does not change in temperature changes. The coordinates of intensive formation of the adsorption volume changed towards increase in the partial pressure of water vapors.

中文翻译：

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水蒸气在层状二硫化钼微粉上吸附-解吸的动力学和热力学

给出了在气相相对湿度范围从 0 到 100% 的二硫化钼上吸附和解吸水蒸气的实验动力学数据。实验中使用微米级层状二硫化钼粉末（由美国Climax Molybdenum Co.制造）。采用重量法研究了水蒸气的吸附-解吸动力学。在连续自动模式下，记录试样的重量变化和过程速率。使用相对湿度为 100% 的空气流进行水蒸气吸附。在等温和非等温条件下（温度在 20-130°C 范围内升高和降低），在气流水蒸气分压降低至相对湿度 55% 的情况下研究解吸。在具有 100% 气相湿度的流动系统中，水蒸气的吸附过程的时间依赖性接近抛物线。吸附对水蒸气压的依赖性 (V = f(P i ) 呈 S 形，弯曲点位于向冷凝诱导填充吸收体积的过渡区域。解吸速率超过吸附速率。吸附势理论Polanyi、Dubinin 和 Radushkevich 的研究被用来评估水分子和不均匀的 MoS 2 多孔结构之间的键能。吸附力和 Pi/Ps 比的变化取决于吸附质体积的变化。吸附等温线为水蒸气在 30 和 50°C 下绘制。应用图形积分方法来确定在水分压 0 < P i < 5 kPa 下形成水吸附体积 (dV i ) 的差异速率。逐步过程的动力学特征显示取决于吸附体积和吸附剂之间相互作用的势能。吸附过程的性质不随温度变化而改变。吸附体积密集形成的坐标随着水蒸气分压的增加而变化。