Abstract

Methane adsorption in MPU-007 microporous carbon adsorbent with a wide pore size distribution was studied at a pressure as high as 40 MPa and the temperatures of 303, 313, 323, and 333 K. The maximum value of methane adsorption of 43.36 wt % was achieved at 303 K and 40 MPa. The isosteres of adsorption derived from the obtained data were satisfactorily approximated by a linear function in coordinates ln P–1/Т at a constant value of adsorption. The dependences of differential molar isosteric heats of methane adsorption in MPU-007 microporous adsorbent on the value of methane adsorption were calculated at the temperatures of 303, 313, 323, and 333 K. The heat of methane adsorption of 14 kJ/mol was constant at a filling of micropores as low as ≈5 mmol/g. Then it declined evenly to 8 kJ/mol at 25 mmol/g and 303 K and to 2 kJ/mol at 24 mmol/g and 323 K. Such a run of the curves describing the heats of adsorption versus adsorption value might be caused by a wide pore size distribution and the association processes in the adsorbate.

中文翻译：

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具有双峰孔径分布的微孔碳吸附剂中的甲烷吸附

摘要

在压力高达40 MPa，温度为303、313、323和333 K的条件下，研究了孔径分布宽的MPU-007微孔碳吸附剂中的甲烷吸附。甲烷吸附的最大值为43.36 wt％。达到303 K和40 MPa。通过线性函数在坐标ln P– 1 / Т中令人满意地近似得出了从所获得的数据得出的吸附等式 以恒定的吸附值 在303、313、323和333K的温度下，计算了MPU-007微孔吸附剂中甲烷吸附的不同等摩尔等距热对甲烷吸附值的依赖性。14 kJ / mol的甲烷吸附热是恒定的微孔填充低至≈5mmol / g。然后，它在25 mmol / g和303 K时均匀下降至8 kJ / mol，在24 mmol / g和323 K时均匀下降至2 kJ / mol。描述吸附热与吸附值的曲线的运行可能是由于宽的孔径分布和被吸附物中的缔合过程。