Liquid hydrogen storage material and preparation method thereof

Abstract

The invention discloses a liquid hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage. The liquid hydrogen storage material comprises a carbazole hydrogen storage component and a hydrogen-rich material corresponding to the carbazole hydrogen storage component, and the carbazole hydrogen storage component is one of carbazole, N-methyl carbazole, N-ethyl carbazole, N-n-propyl carbazole, N-isopropyl carbazole or N-n-butyl carbazole. The hydrogen-rich material corresponding to the carbazole hydrogen storage component is one or a mixture of more of partial or complete hydrogenation products of the carbazole hydrogen storage component. The liquid hydrogen storage material provided by the invention has a lower melting point; due to the special relationship between the added hydrogen-rich material and the carbazole hydrogen storage component, the influence of the added hydrogen-rich material on catalyst selection does not need to be considered, and the catalyst for catalyzing the carbazole hydrogen storage component can be directly used for catalyzing the liquid hydrogen storage material; the selection of a catalyst is not influenced, and expanded production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage, and in particular relates to a liquid hydrogen storage material and a preparation method thereof. Background technique [0002] Hydrogen energy is considered to be an ideal energy source in the future due to its advantages such as abundant resources, no pollution, renewable, and high energy density. The storage of hydrogen energy is the key to the large-scale application of hydrogen energy. Common hydrogen storage methods include pressurized gaseous hydrogen storage, low-temperature liquefied hydrogen storage, carbonaceous material hydrogen storage, metal alloy hydrogen storage, organic liquid hydrogen storage, etc. Among them, organic liquid hydrogen storage has the advantages of high hydrogen storage capacity, convenient and safe transportation, large-scale, long-distance, long-term hydrogen energy storage and transportation, and multiple recycling. It is a promising hydrogen storage ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, liquid hydrogen storage materials with good application prospects are based on carbazole and its derivatives. Carbazole organic compounds have high hydrogen storage density, and the purity of hydrogen obtained from the dehydrogenation reaction of their complete hydrogenation products is High, no CO, NH 3 It is an ideal organic liquid hydrogen storage medium. However, although the melting point of the fully hydrogenated product of carbazole organic matter is very low, it can be transported through pipelines for long distances, but the melting point of unhydrogenated carbazole organic matter is higher. , it is solid at room temperature, which requires additional heating of a large number of pipelines during the hydrogenation process, which will cause huge energy consumption in actual production; in addition, in order to ensure the normal operation of the gas-liquid separator, the gas-liquid separator The product needs to be liquid at room temperature, which requires that the product entering the gas-liquid separator for the first time must have a high hydrogen storage capacity in order to maintain a liquid state at room temperature, and it is impossible to increase the hydrogen storage capacity through multiple product recirculation, which is limited Due to the processing capacity of the catalyst, this means that in actual production, it will be difficult to expand the reaction scale of the hydrogenation reaction using pure carbazole-based organics as hydrogen storage materials

[0004] The most direct solution to the above problems is to reduce the melting point of carbazole hydrogen storage materials. Usually, the solution is to add some additives (mainly aromatic compounds with low melting points). However, due to the combination of aromatic compound additives and carbazole The different temperatures of the dehydrogenation reaction of components will greatly affect the selection of catalysts for hydrogen storage materials, and it is easy to generate impurity gas, which affects the purity of hydrogen generated by dehydrogenation reaction; and some additives need to be dehydrogenated due to incomplete dehydrogenation reaction. A separation device is installed in the post-reaction stage to separate carbazole components and additives