South China University of Technology

Jiangwen Liu

Min Zhu

Hui Wang

Liuzhang Ouyang

Wei Chen

Kang Chen

Deqian Zhao

Hao Zhong

Ruoming Duan

Huaijun Lin

Weihua Wang

A method for preparing lithium borohydride by means of room temperature solid phase ball milling, comprising the following steps: uniformly mixing a magnesium-containing reducing agent and a lithium metaborate-containing reducing material under a non-oxidizing atmosphere at room temperature, performing solid phase ball milling, isolating and purifying to obtain lithium borohydride. The method has the advantages of having a simple process, having a controllable and adjustable reaction procedure, having mild reaction conditions, energy consumption being low, costs being low, and output being high, while creating no pollution, being safe and cyclically using boron resources, having important practical significance.

Method for preparing lithium borohydride by means of solid-phase ball milling at room temperature

The present invention discloses a method for directly synthesizing sodium borohydride by solid-state ball milling at room temperature, which comprises: performing solid-state ball milling on a mixture of a reducing agent and a reduced material by using a ball mill under room temperature, and performing purification to obtain sodium borohydride. The reducing agent comprises one or more of magnesium, magnesium hydride, aluminum, calcium, and magnesium silicide. The reduced material is sodium metaborate containing crystallization water or sodium metaborate, or is a mixture of sodium metaborate containing crystallization water and sodium metaborate. The solid-state milling is performed in a mixed atmosphere of argon and hydrogen, or an argon atmosphere, or a hydrogen atmosphere. The present invention has a simple process, a controllable and adjustable reaction procedure, mild reaction conditions, low energy consumption, low costs, high yield, no pollution, good safety, and easy industrial production.

Method for directly synthesizing sodium borohydride by solid-state ball milling at room temperature

Provided are a CaMg-based alloy hydride material for hydrolysis production of hydrogen, a preparation method therefor and a use thereof. The material has a general formula of CaMgMH, wherein M is Ni, Co or Fe, 1.5&#x2264;x&#x3c;2.0, 0&#x3c;y&#x2264;0.5, and 3&#x2264;z&#x3c;6. The preparation method for the material comprises the following steps: (1) stacking three pure metal block materials in a crucible, wherein a metal block material M is placed at the top; (2) installing the crucible in a high-frequency induction melting furnace, evacuating and introducing an argon gas; (3) starting the high-frequency induction melting furnace to heat at a low power first, then increasing the power to uniformly fuse same; and thereafter cooling with the furnace to obtain an alloy ingot, and hammer-milling to obtain a hydrogen storage alloy based on CaMg; and (4) hydrogenating the hammer-milled hydrogen storage alloy to obtain the material for hydrolysis production of hydrogen. The preparation method is simple and low in cost. The material can absorb hydrogen at normal temperature with a good hydrogen absorption performance. The prepared hydrogen is pure, and can be directly introduced into and used in a hydrogen fuel battery.

[object Object]

A method for preparing a magnesium-based hydrogen storage material, includes: a Mg&#x2014;Ce&#x2014;Ni family amorphous alloy is prepared by a rapid cooling process; the amorphous alloy is pulverized, so as to obtain a amorphous powder; the amorphous alloy is activated, so as to obtain a MgH&#x2014;MgNiH&#x2014;CeHfamily nanocrystalline composite; the abovementioned composite is carried out a hydrogen absorption and desorption cycle, then the composite is placed in a pure Ar atmosphere for passivation, finally, the passivated composite is oxidized, so as to obtain a MgH&#x2014;MgNiH&#x2014;CeH&#x2014;CeOfamily nanocrystalline composite.

Magnesium-based hydrogen storage material and method for preparing the same

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Guangzhou, China

Jiangwen Liu