YK-1活性炭平衡储氢特性分析

文中基于氢在椰壳活性炭YK-1上的平衡吸附数据,以探寻氢在碳基材料上适宜存储条件为目的,研究吸附氢分子间相互作用能随储存系统温度、压力、表面遮盖率的变化规律。首先,依据容积法的原理,在温度区间113K—293K、压力范围0—13MPa测试氢在YK-1椰壳活性炭上的吸附等温线。其次,应用格子理论推导通用吸附等温方程,通过等温方程的线性标绘确定氢分子在吸附表面的最大浓度,并由氢分子在活性炭典型吸附空间内受到的壁面作用势函数迭代求解氢分子受到的壁面作用势,进而获得与各吸附平衡态对应的氢分子间相互作用能。最后,根据氢分子间作用能随温度、表面遮盖率等的变化关系,分析氢分子在此活性炭上吸附的特点。

Adsorption equilibrium of hydrogen molecules on activated carbons YK-1

Hydrogen adsorption data on the coconut shell activated carbon YK-1,volumetrically measured over a temperature-pressure range respectively within 113K—293K and 0—13MPa,were analyzed to study the adsorption equilibrium of the hydrogen molecules.Principles of thermodynamic equilibrium in each adsorption equilibrium state were applied to a lattice theory based adsorption model for determining the maximum surface concentration of hydrogen molecules.The adsorption potential was iteratively set on the 10-4-3 model developed by Steele,and the molecular interaction energy among hydrogen molecules was then determined by the linear fit of the adsorption data.Results show that the interaction energies are nearly in three cubed relationship with the adsorption equilibrium pressure,in quartic equation with the surface coverage and almost in linear relationship with the temperature.However,the variation tendencies of the interaction energies on the adsorbent did not reveal relevant information about the suitable condition for the storage of hydrogen by adsorption on carbon based adsorbents.