A kind of magnesium-based powder composite hydrogen production material containing Bi and Mo and its preparation method and application

Abstract

The invention discloses a magnesium-based powder composite hydrogen production material containing Bi and Mo. Bi / Mo compound is prepared by hydrothermal method by preparing soluble Bi salt and soluble Mo salt, and then the raw material Mg powder and Bi / Mo compound For ball milling and mixing, the Bi / Mo compound must meet the following two characteristics at the same time, one is nano-scale crystals, and the other is that during the ball milling process, the nano-scale crystals of Bi-containing compounds do not react with Mg powder and are evenly attached to Mg powder ; The Bi / Mo compound is Bi 2 MoO 6 , the size of the Bi / Mo compound is 1‑5 μm, and the Bi / Mo compound consists of nanoscale crystals with a size of 100‑200 nm. The preparation method comprises the following steps: 1) preparation of Bi-containing compound; 2) preparation of magnesium-based powder composite hydrogen production material containing Bi and Mo. As a hydrolysis hydrogen production material, the reaction hydrogen production is 801.4‑859.2 mLg ‑1 , the hydrogen production rate can reach 91.9‑98.9%, and the apparent activation energy is 34‑35 KJ·mol ‑1 . The invention has the following advantages: the nano-scale particles are evenly attached to the surface of the Mg particles to provide active sites; and it has good oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of energy, in particular to a magnesium-based powder composite hydrogen-producing material containing Bi and Mo, and a preparation method and application thereof. Background technique [0002] Among many energy sources, hydrogen energy, as an ideal secondary energy carrier, has received extensive attention and research due to its environmental friendliness, wide sources and high energy density. The preparation and storage of hydrogen energy has always been the focus of hydrogen energy research. The use of magnesium-water reaction to prepare hydrogen is an efficient and clean method for hydrogen production. The theoretical hydrogen production of magnesium-based hydrogen production materials is high, the reserves are abundant and easy to obtain, the reaction conditions are mild, and the products are pollution-free. prospect. [0003] At present, the main preparation method of magnesium-based hydrogen producti...

AI Technical Summary

Problems solved by technology

However, the technical problem of this technology is that it has the problem of low hydrogen conversion rate at room temperature

[0004] However, in this hydrolysis technique, as the hydrolysis reaction proceeds, the formed Mg(OH) 2 The dense passivation layer blocks the contact between water and Mg particles, thereby hindering further reactions, resulting in a sharp decrease in the kinetics of hydrolysis reactions

Moreover, since magnesium metal powder is easy to oxidize, the MgO oxide layer that is easily formed with oxygen in the air will hinder the hydrolysis reaction between water and Mg particles and will also lead to a decrease in the kinetics of the hydrolysis reaction.

In addition, due to the soft ductility of magnesium metal, its ball milling performance is not good, and it is difficult to improve its hydrolysis performance by ball milling and other mechanical methods. The improvement of its hydrolysis performance can be achieved by reducing or destroying its dense passivation layer. An efficient and clean hydrogen production material, and its process optimization, has important research and practical significance

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