Catalyst enhanced MgAl-based hydrogen storage material

Abstract

The invention provides a catalyst enhanced MgAl-based hydrogen storage material, which is prepared by the following method: provide Mg and Al metal raw materials: weigh the Mg and Al metal raw materials according to a molar ratio of Mg: Al=(16-18): (11-13); perform the first vacuum melting on the Mg and Al metal raw materials; and crush the primary Mg alloy ingots to obtain the primary Mg alloy blocks; provide Ti, Zr and V metal raw materials weigh the primary Mg alloy blocks, and the Ti, Zr and V metal raw materials; perform ball milling treatment to obtain composite metal powder; press the composite metal powder into the loose alloy ingots; perform hot pressing treatment on the loose alloy ingots to obtain the dense alloy ingots, perform heat treatment on the dense alloy ingot; and wire cut the dense alloy ingots after heat treatment.

1 . A catalyst enhanced MgAl-based hydrogen storage material, characterized in that: the catalyst enhanced MgAl-based hydrogen storage material in this invention is prepared by the following method:
 Provide Mg and Al metal raw materials;   Weigh the Mg and Al metal raw materials according to a molar ratio of Mg: Al=(16-18):(11 -13);   Perform a first vacuum melting on the Mg and Al metal raw materials after weighing to obtain a primary Mg alloy ingots;   Crush the primary Mg alloy ingots mentioned above to obtain the primary Mg alloy blocks;   Provide Ti, Zr and V metal raw materials;   Weigh the primary Mg alloy blocks and the Ti, Zr and V metal raw materials according to a predetermined weight;   Perform ball milling treatment on the primary Mg alloy blocks and the Ti, Zr and V metal raw materials to obtain composite metal powder;   Press the composite metal powder into the loose alloy ingots by using the cold isostatic pressure method;   Perform hot pressing treatment on the loose alloy ingots to obtain the dense alloy ingots;   Perform heat treatment on the dense alloy ingots;   Wire cut the dense alloy ingots after heat treatment.   
     
     
         2 . The catalyst enhanced MgAl-based hydrogen storage material mentioned in  claim 1 , characterized in that: specifically, the first vacuum melting process is as follows: the vacuum degree is less than 0.01 Pa, and the smelting time is 20-30 min, the alloy ingots are flipped once every 80-10 s during the smelting process. 
     
     
         3 . The catalyst enhanced MgAl-based hydrogen storage material mentioned in  claim 1 , characterized in that: in this process, the predetermined weight is as follows: 100-150 parts of primary Mg alloy blocks, 2-4 parts of Ti metal, 3-5 parts of Zr metal, and 1-3 parts of V metal. 
     
     
         4 . The catalyst enhanced MgAl-based hydrogen storage material mentioned in  claim 1 , characterized in that: the ball milling treatment performed on the primary Mg alloy blocks and the Ti, Zr and V metal raw materials is specifically that the ratio of ball to material is 10:1-15:1, the the ball milling atmosphere is argon atmosphere, the ball milling speed is 900-1300 r/min, the ball milling time is 40-60 h. 
     
     
         5 . The catalyst enhanced MgAl-based hydrogen storage material mentioned in  claim 1 , characterized in that: the ball milling treatment performed on the primary Mg alloy blocks and the Ti, Zr and V metal raw materials further includes: in the ball milling process, each ball milling lasts 50-60 min, and suspend the ball milling for 8-15 min, the temperature in the ball milling tank is controlled to be lower than 500° C. during the ball milling process. 
     
     
         6 . The catalyst enhanced MgAl-based hydrogen storage material mentioned in  claim 1 , characterized in that: perform hot pressing treatment on the loose alloy ingots to obtain the dense alloy ingots, specifically, the hot pressing air pressure is lower than 0.03 Pa, the hot pressing temperature is 600-700°C., the hot pressing pressure is 50-70 MPa, and the hot pressing time is 30-50 min. 
     
     
         7 . The catalyst enhanced MgAl-based hydrogen storage material mentioned in  claim 1 , characterized in that: perform heat treatment on the dense alloy ingots, specifically, the heat treatment air pressure is less than 0.01 Pa, the heat treatment temperature is 150-200° C., the heat treatment time is 30-40 h, and the heating rate is 2-4° C./min.