Brandani Stefano, Mangano Enzo, Sarkisov Lev
Scottish Carbon Capture and Storage, School of Engineering, The University Edinburgh, The King's Buildings, Mayfield Road, Edinburgh, EH9 3FB UK.
Adsorption (Boston). 2016;22(2):261-276. doi: 10.1007/s10450-016-9766-0. Epub 2016 Feb 1.
The definitions of absolute, excess and net adsorption in microporous materials are used to identify the correct limits at zero and infinite pressure. Absolute adsorption is shown to be the fundamental thermodynamic property and methods to determine the solid density that includes the micropore volume are discussed. A simple means to define when it is necessary to distinguish between the three definitions at low pressure is presented. To highlight the practical implications of the analysis the case of adsorption of helium is considered in detail and a combination of experiments and molecular simulations is used to clarify how to interpret adsorption measurements for weakly adsorbed components.
微孔材料中绝对吸附、过量吸附和净吸附的定义用于确定零压力和无限压力下的正确极限。结果表明，绝对吸附是基本的热力学性质，并讨论了确定包含微孔体积的固体密度的方法。本文提出了一种简单的方法，用于定义在低压下何时需要区分这三种定义。为了突出该分析的实际意义，详细考虑了氦吸附的情况，并结合实验和分子模拟来阐明如何解释弱吸附组分的吸附测量结果。
