关键词: 溶解度, 相平衡, 有机液态储氢载体, 氢气, 加氢反应

Abstract:

Hydrogen energy is an important support for achieving the dual-carbon goal, and the technology based on liquid organic hydrogen carriers (LOHCs) is significant for developing hydrogen energy. Aromatic heterocyclic compounds as hydrogen storage carriers have attracted research interests from the field of research and industry. But, there is no enough and in-depth research efforts on low efficiency during the hydrogenation process. To complete the scientific design and process optimization of hydrogenation, the research on solubility and phase equilibrium concerning the hydrogen storage system is indispensable. The LOHCs hydrogenation involves a sequential process composed of physical dissolution and chemical reaction in the gas-liquid-solid three-phase system. The hydrogen for hydrogenation comes from the hydrogen dissolved in the liquid. However, due to the lack of fundamental data concerning solubility and phase equilibrium of hydrogen in the liquid phase, the current kinetic calculations for hydrogenation are not accurate and require correction of the solubilities of hydrogen in different LOHCs. This article describes the current research status regarding hydrogen solubility in LOHCs, involving the solubilities of pure hydrogen and some mixed gases in LOHCs. The types, advantages and disadvantages of the experimental methods used for hydrogen solubility are described in details. Experimental devices are built based on different experimental methods, and the correlation model and prediction model of the determined data are briefly discussed.

Key words: solubility, phase equilibrium, liquid organic hydrogen carriers (LOHCs), hydrogen, hydrogenation