Abstract

The adsorption of propane on an ACW supermicroporous adsorbent with a wide pore size distribution at pressures up to 1 MPa and temperatures of 303, 313, 323, and 333 K was studied. The maximum value of propane adsorption at a temperature of 303 K and a pressure of 1 MPa is equal to 21.6 mmol/g. The dependences of the differential molar isosteric heat of adsorption of propane on the value of adsorption are calculated. In the initial region of micropore filling of up to ~6 mmol/g, the heat of propane adsorption on the microporous adsorbent is practically constant (~27 kJ/mol). Then, as the micropores are filled, the heat of adsorption drops to 25 and 23 kJ/mol at temperatures of 303 and 333 K, respectively. Thereafter, a sharper drop in heat occurs to 20 kJ/mol at 20 mmol/g. As a result of calculations, the temperature dependence of heat on propane adsorption is obtained in the form of a fan of curves. The experimental data are compared with the results of calculations of propane adsorption based on Dubinin’s theory of volumetric filling of micropores using the structural and energy characteristics of the adsorbent.

中文翻译：

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亚临界温度条件下丙烷在孔径分布宽的超微孔碳吸附剂上的吸附

摘要

研究了丙烷在高达1 MPa的压力和303、313、323和333 K的温度下在宽孔径分布的ACW超微孔吸附剂上的吸附性能。在303 K的温度和1 MPa的压力下丙烷吸附的最大值等于21.6 mmol / g。计算了丙烷吸附的不同等摩尔等规热吸附量与吸附量的关系。在微孔填充的初始区域最高可达〜6 mmol / g时，丙烷在微孔吸附剂上的吸附热量实际上是恒定的（〜27 kJ / mol）。然后，随着微孔的填充，在303和333 K的温度下，吸附热分别下降到25和23 kJ / mol。此后，在20 mmol / g时，热量急剧下降至20 kJ / mol。经过计算，以曲线扇的形式获得热量对丙烷吸附的温度依赖性。根据吸附剂的结构和能量特征，将实验数据与基于杜宾宁微孔体积填充理论的丙烷吸附计算结果进行了比较。