天然气吸附存储的实验研究方法

在车用天然气的吸附存储技术中，超临界温度下甲烷的物理吸附和天然气的各组分在多孔吸附剂上的吸附平衡具有重要的实际意义，而建立一个能清晰阐述气－固系统热力学特性的等温线模型是该领域的一个难点。由于模型的过于简化及忽略吸附剂表面能量不均一性及微孔分布等重要因素，使得分子模拟的结果也不够理想，因此开展这方面的实验与研究很有必要。综述了以车用存储为目的的天然气多组分气相吸附平衡的传统与最新的实验方法。

Experimental Methods of Adsorbed Natural Gas Storage

Physical adsorption of methane above the critical point and the adsorption equilibria of the mixture of natural gas on microporous sorbents is of great practical importance for vehicular natural gas storage technology. One of the difficulties in this area has to develop a simple model for the adsorption isotherms, which must have a clear physical interpretation in terms of thermodynamic properties of the gas-solid system. The success in this area has been limited. The results obtained from molecular simulation are often dissatisfactory because the simulation model is usually oversimplification of the structure of the adsorbents and ignores several important effects such as energetic heterogeneity of the surface, distribution of pore sizes,and so on. So experiments are still indispensable. An overview of classical and new methods to measure multicomponent gas adsorption equilibria tightly related to the vehicular natural gas storage is given.