A microporous carbon adsorbent MPU-007 with a wide pore size distribution (specific micropore volume W0 calculated within the framework of the theory of micropore volume filling is 1.44 cm3 g−1; first-mode micropore diameter X01 is 1.5 nm; second-mode micropore diameter X02 is 3.5 nm; specific surface area SBET is 2520 m2 g−1) was prepared by chemical activation of a mixture of corn dextrin, ethylene glycol, and phenol formaldehyde resin. Adsorption of ethane on this adsorbent was studied at pressures up to 4 MPa at T = 303, 313, 323, and 333 K. The maximum ethane adsorption value attained in the experiments was 25 mmol g−1 or 75 wt%. The adsorption isosteres plotted in the ln P–1/T coordinates using the data obtained can be well approximated by linear functions at constant adsorption values. The dependences of the differential molar isosteric heats of adsorption of ethane on MPU-007 on the amount adsorbed in the temperature range of 303–333 K were calculated. The heat of adsorption of ethane equal to 23 kJ mol−1 remained constant throughout the initial range of micropore fillings up to ∼7 mmol g−1 and then gradually decreased to 8 kJ mol−1 at an uptake of 24 mmol g−1 at 333 K. Such a pattern of the dependence of the heat of adsorption can be due to a wide pore size distribution and to the formation of associates in the adsorbate.

中文翻译：

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乙烷在宽孔径分布的微孔碳吸附剂上的吸附

一种具有较宽孔径分布的微孔碳吸附剂MPU-007（在微孔体积填充理论框架内计算的比微孔体积W0为1.44 cm3 g-1；一阶微孔直径X01为1.5 nm；二阶微孔直径 X02 为 3.5 nm；比表面积 SBET 为 2520 m2 g-1) 是通过玉米糊精、乙二醇和酚醛树脂的混合物的化学活化制备的。在 T = 303、313、323 和 333 K 下，在高达 4 MPa 的压力下研究了乙烷在该吸附剂上的吸附。实验中获得的最大乙烷吸附值为 25 mmol g-1 或 75 wt%。使用获得的数据绘制在 ln P-1/T 坐标中的吸附等排线可以很好地通过线性函数在恒定吸附值下近似。计算了乙烷在 MPU-007 上的微分摩尔等量吸附热对在 303-333 K 温度范围内吸附量的依赖性。乙烷的吸附热等于 23 kJ mol-1，在微孔填充的初始范围内保持恒定，直到 7 mmol g-1，然后在吸收 24 mmol g-1 时逐渐降低到 8 kJ mol-1。 333 K。这种吸附热依赖性模式可能是由于孔径分布较宽和吸附物中缔合体的形成。