Oxidation resisting hydrolysis hydrogen generation composite powder and preparation method thereof

Abstract

The invention discloses oxidation resisting hydrolysis hydrogen generation composite powder. The composite powder is of a half-wrapped or fully-wrapped core / shell type composite structure which is formed by monotectic alloy M-N. The core is an M-rich phase, the shell is an N-rich phase, and a large number of microcracks and M-rich phase granules exist in a shell layer. The entire composite powder comprises, by weight, 0.5-99.9% of M and 0.1-99.5% of N. The invention further discloses a preparation method of the oxidation resisting hydrolysis hydrogen generation composite powder. According to the oxidation resisting hydrolysis hydrogen generation composite powder and the preparation method thereof, the technology is simple, other substances such as hydride and salt do not need to be added, and thus cost is low. The composite powder can be used for rapid hydrogen production with water, water temperature and water quality restrictions are removed, hydrogen can be produced and supplied immediately, the storage and transportation problem of the hydrogen is solved, and costs and risks are lowered. The composite powder is stable in property, high in oxidation resistance, simple in preservation method and convenient to carry. Tremendous application value and market prospects can be achieved both in the civilian field such as a movable hydrogen source and a hydrogen-powered car and the military field such as a submarine, a vessel and a torpedo.

Description

technical field [0001] The invention relates to a composite powder material, in particular to an anti-oxidation hydrolysis hydrogen production composite powder and a preparation method thereof. Background technique [0002] In the 21st century, the depletion of traditional resources such as oil and the deteriorating environment have stimulated the development and utilization of new green energy such as solar energy, hydrogen energy, wind energy, and geothermal energy in countries all over the world. Among them, hydrogen energy has the advantages of wide sources, clean and environmentally friendly, storable and renewable, and is regarded as the green energy with the most development potential in the 21st century (Shao Yuyan, Yin Geping, Gao Yunzhi; Opportunities and challenges facing the hydrogen economy[J]; Power Technology; 2005, 29: 410-415). Traditional hydrogen production methods are mainly divided into hydrogen production from fossil fuels and hydrogen production from ...

AI Technical Summary

Problems solved by technology

Although the aluminum alloy can react with water at room temperature, and the hydrogen production can reach about 95% of the theoretical value, the patent has the following serious defects: This patented product is very unstable, if it is exposed to the air, it will be quickly oxidized and lose its activity, and the hydrogen production performance will be greatly reduced (this has been pointed out by H.Z.Wang in the literature "H.Z. Wang, D.Y.C. Leung, M.K.H. Leung, M. Ni, Renewable and Sustainable Energy Reviews 13 (2009) 845-853” clearly stated)

The main disadvantages of this patent are: In this patent, the three elements of Ga, In, and Sn must have a strict ratio (6:3:1) to form GaIn 3 Sn compound phase, and, since GaIn 3 The Sn phase is liquid at room temperature (the melting point of the compound is only about 11°C), therefore, the composition and process conditions must be strictly controlled during the preparation and storage of this patented product, especially the temperature, which greatly increases the The difficulty of actual production operation increases the cost

The main disadvantage of this patent is that the hydrogen production effect is poor. Only a small amount of bubbles are generated at room temperature. When the reaction temperature reaches 50°C, a more obvious hydrogen production reaction can occur.

It can be seen from Figure 21 of the patent specification that after 200 hours of reaction, the hydrogen production rate is still less than 50%.

[0010] Regarding hydrogen production by aluminum hydrolysis reaction, there are still many related patents at home and abroad. Although the conditions of aluminum hydrolysis reaction have been reduced to a certain extent and the conversion rate of hydrogen has been improved, there are still some defects: first, it is necessary to add active metals (such as Lithium), metal hydrides (such as CaH 2 ), borohydride and other substances as activators or catalysts, but the preparation process of these additives is complicated, the cost is expensive, and at the same time, strict storage conditions are required, otherwise failure or explosion hazard will occur; secondly, acids and alkalis need to be added , hydroxide, salts and other substances, which will cause the reaction product to appear acidic or alkaline, or produce a halogen salt solution, which will cause serious harm to the equipment and is not environmentally friendly; third, the preparation and storage conditions of the invented product are relatively harsh , Poor oxidation resistance, after the product is made, it must be protected by an inert atmosphere such as argon, nitrogen, etc. If it is exposed to the air, it will lose its activity soon, and the hydrogen production performance will be greatly reduced; Fourth, the hydrolysis reaction conditions are still very limited , requires certain temperature conditions, and the conversion rate at room temperature and low temperature is not high; fifth, the preparation process is complex, such as the use of mechanical ball milling, which will have fatal shortcomings such as long time consumption, high noise, and low effective power

[0011] Although there are many methods for the preparation of hydrogen production materials by hydrolysis, there is no report on the use of atomization powder production methods

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