Magnesium base hydride composite system for hydrolysis hydrogen production and preparation method and application thereof

Abstract

The invention discloses a magnesium base hydride composite system for hydrolysis hydrogen production and a preparation method and application thereof. The composite system is prepared by a method comprising the following steps of: taking magnesium powder and nickel powder in a mole ratio of 30:1-49:1; performing hydrogenation combustion synthesis under the action of a catalyst and an organic dispersant which account for 3 to 10 percent of the total weight of the mixture of the magnesium powder and the nickel powder; and performing strong mechanical ball milling. The magnesium hydride in the prepared magnesium base hydride composite system for the hydrolysis hydrogen production accounts for 95 to 98 percent of the weight of hydride, and the magnesium nickel hydride accounts for 2 to 5 percent; the catalyst is one of graphite, B, Al, La, Ca, V, Ce and Nb; the magnesium hydride is MgH2; and the magnesium nickel hydride is a mixture of Mg2NiH4 and Mg2NiH0.3 in any ratio. The theoretical hydrogen production amount of the composite system is up to 1,600 ml / g, and a preparation process of the magnesium base hydride composite system is time-saving, energy-saving and simple and is easy for industrial production.

Description

Technical field: The invention relates to the technical field of energy chemistry and chemical power supply products, in particular to a magnesium-based hydride composite system for hydrogen production by hydrolysis, a preparation method thereof, and an application for hydrogen production. Background technique: With the development of society, people's demand for energy is increasing, traditional fossil energy is becoming exhausted, CO 2 The emissions are causing the greenhouse effect to become more and more serious. Under such circumstances, people urgently need to develop new green alternative energy sources, and hydrogen energy is one of the most promising forms of energy. Hydrogen is a high-energy-density, clean new energy with a wide range of sources, and it has no toxic side effects on the human body. In recent years, fuel cells have developed rapidly, especially proton exchange membrane fuel cells, which are expected to become an important power generation method in...

AI Technical Summary

Problems solved by technology

However, the kinetics of the hydrolysis reaction of magnesium-based hydrides is poor, and the effective hydrogen production is low.

At the same time, the preparation conditions of the hydride are harsh. The traditional preparation method needs to react with hydrogen at 300-400 ° C and a pressure of 40 MPa, and the preparation cost is relatively high.

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