A kind of method for preparing aluminum hydride

Abstract

The invention discloses a method for preparing aluminum hydride, which uses quaternary ammonium salts, alkali metal aluminum hydrides and halogenated hydrocarbons as raw materials, and comprises the following steps: (1) under a nitrogen atmosphere, the aluminum hydride is equipped with magnetic stirring, reflux condensation Add alkali metal aluminum hydride and spherical inorganic oxide grinding medium to the reactor of tube and constant pressure dropping funnel, then add anhydrous aromatic hydrocarbon, and stir for 0.5-1h; transfer the aromatic hydrocarbon solution of quaternary ammonium salt to the constant pressure dropping funnel Add it dropwise to the reactor, continue to stir, and react at 25-60°C for 6-24 hours; let it stand for cooling, and filter to obtain the aromatic hydrocarbon solution of quaternary ammonium aluminum hydride; (2) Add the crystallization aid to the quaternary ammonium aluminum hydride In the aromatic hydrocarbon solution of the compound, add the aromatic hydrocarbon solution of halogenated hydrocarbon dropwise, and a precipitate is formed; after the dropwise addition, continue to stir for 2 to 5 hours, a large amount of white precipitate forms, filter, wash, and vacuum dry to obtain a white solid product. The method has the advantages of simple process, safe operation, high yield and easy production expansion.

Description

technical field [0001] The invention relates to a synthesis method of aluminum hydride and belongs to the field of new energy. Background technique [0002] One of the major challenges in finding solutions for hydrogen energy applications is the development of solid-state hydrogen storage media for vehicles. As a new type of hydrogen storage material, aluminum trihydride has a mass hydrogen storage of 10.08%, a volume hydrogen storage of 1.486g / mL (about twice the volume of liquid hydrogen), and a modified hydrogen release temperature lower than 100°C. With the rise of hydrogen fuel cells, especially low-temperature proton exchange membrane fuel cells, research on aluminum hydride has received more and more attention. [0003] There are many methods for synthesizing aluminum hydride reported at home and abroad. The main method is to prepare solvated aluminum hydride diethyl ether complex first, and then synthesize non-solvated aluminum hydride with different crystal forms t...

AI Technical Summary

Problems solved by technology

[0014] Aiming at the problems that the preparation method in the prior art requires a large amount of ether and the cost is high, the intermediate aluminum hydride is difficult to purify, the yield of aluminum hydride is low, and the particles are fine, etc., the technical solution of the present invention is: a method for preparing aluminum hydride, using Quaternary ammonium salt, alkali metal aluminum hydride and halogenated hydrocarbon are raw materials, comprising the following steps:

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