A new calculation method was presented using surface area data for the thermal analysis of adsorbents. Five parts from a silica gel (Hypersil) were heated at the temperatures of 500, 640, 700, 770, and 850 °C, respectively, for 16 h. The maximum adsorption capacity as liquid nitrogen volume (0.930 cm³ g⁻¹), monolayer capacity (0.093 cm³ g⁻¹), surface area (A_H = 245 m² g⁻¹), number of monolayer (10) in the multimolecular adsorption, and heat of the first layer (3300 J mol⁻¹) were evaluated from the nitrogen adsorption data obtained at − 196 °C. Surface area (A) of the preheated samples was determined similarly. The assumed parameters \(k = - (\partial A/\partial T)_{\text{p}} / A\) and \(K = \left( {1 - a} \right)/ a\) were calculated for each preheating temperature, where \(a = A/A_{\text{H}}\) is the relative decrease in the surface area by the thermal deactivation, because the k and K supplying Arrhenius equations and van’t Hoff equation behave as reaction rate constant and equilibrium constant, respectively. The activation energy for the thermal deactivation of the silica gel was calculated as \(E^{\# } = 27330\) J mol⁻¹ from the slope of a straight line which is plotted according to the Arrhenius equation. The enthalpy change \((\Delta H^{0} = 28936\) J mol⁻¹) and entropy change (\(\Delta S^{0} = 47.42\) J mol⁻¹ K⁻¹) for the same case were, respectively, evaluated from the slope and intercept of a straight line which is plotted according to the van’t Hoff equation. Accordingly, temperature dependence of the Gibbs energy is written as \(\Delta G^{0} = \Delta H^{0} - T\Delta S^{0} = 28936 - 47.42 T\) by the SI units. The spontaneous nature of the deactivation was discussed using the last relationship.

提出了一种利用表面积数据对吸附剂进行热分析的新计算方法。将五份硅胶（Hypersil）分别在500、640、700、770和850°C的温度下加热16小时。最大吸附容量为液氮体积（0.930 cm ³  g ^-1），单层容量（0.093 cm ³  g ^-1），表面积（A _H  = 245 m ²  g ^-1），单层（10）的数量从在-196℃获得的氮吸附数据评估多分子吸附和第一层的热（3300J mol ^-1）。表面积（A相似地确定）的预热样品。假设参数\（k =-（\ partial A / \ partial T）_ {\ text {p}} / A \）和\（K = \ left（{1-a} \ right）/ a \）为计算每个预热温度，其中\（a = A / A _ {\ text {H}} \）是热失活引起的表面积相对减少，因为k和K分别提供了Arrhenius方程和van't Hoff方程分别表现为反应速率常数和平衡常数。硅胶热失活的活化能计算为\（E ^ {\＃} = 27330 \）  J mol ^-1从根据Arrhenius方程绘制的直线的斜率开始。相同的焓变\（（\ Delta H ^ {0} = 28936 \）  J mol ^-1）和熵变（\（\ Delta S ^ {0} = 47.42 \）  J mol ^-1  K ^-1）根据van't Hoff方程绘制的直线的斜率和截距分别评估了这种情况。因此，通过SI单位将吉布斯能量的温度依赖性写为\（\ Delta G ^ {0} = \ Delta H ^ {0}-T \ Delta S ^ {0} = 28936-47.42 T \）。使用最后一种关系讨论了停用的自发性质。