A kind of preparation method of antipoison metal hydrogen absorbing material

Abstract

The invention discloses a preparation method of an anti-poisoning metal hydrogen absorbing material. The method is as follows: after partial hydrogenation of the metal hydrogen absorbing material, mechanically pulverize it into metal particles, and then coat Pd film and Cu film on the surface of the metal particles by electroless plating to form a Pd-Cu composite film, and then coat the coated metal particles. The metal particles are heat-treated to alloy the Pd‑Cu composite film. The Pd-Cu alloy film on the surface of the anti-poisoning metal hydrogen absorbing material prepared by this method is not easy to break and fall off during the hydrogen absorbing and desorbing process, which ensures the stability of the hydrogen absorbing and desorbing performance of the material in the hydrogen isotope gas containing impurity gas. That is, the material has a high cycle life.

Description

technical field [0001] The invention relates to a preparation method of an anti-poisoning metal hydrogen-absorbing material, in particular to a preparation method of a metal hydrogen-absorbing material with a high cycle life in a hydrogen isotope gas containing impurity gas, which belongs to hydrogen isotope recovery, storage and transportation materials technology field. Background technique [0002] Hydrogen and its isotopes are important energy substances. In social production and national defense applications, hydrogen and its isotopes play an important role. Hydrogen-absorbing materials can realize the controllable absorption and release of hydrogen and its isotopes to meet various hydrogen application fields. The need for safe storage and transport of hydrogen. However, in the actual application of hydrogen and its isotopes, hydrogen often contains some impurity gases, such as CO, CO 2 、CH 4 , O 2 , N 2 Wait. These impurity gases are often more likely to react wi...

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Problems solved by technology

However, due to the thick coating of silica gel, the effective hydrogen absorption rate of the material will drop sharply.

When the metal Pd film adsorbs and desorbs hydrogen below 300 °C, the mutual transformation between the α phase and the β phase will occur. Due to the difference in the lattice constants of the two phases, the nucleation and growth of the β phase in the α phase will be difficult. Severe stress is generated in the material, which causes the Pd film to pulverize after several times of hydrogenation / dehydrogenation, thereby reducing its selective permeability to hydrogen, thereby reducing the cycle life of the material

The hydrogen permeability and mechanical strength of the Pd-Ag alloy film are higher than that of the pure Pd film, but when the Pd-Ag alloy film is used at high temperature, its grains will grow, which will reduce the compactness and mechanical strength of the film layer, resulting in its hydrogen The reduction in selective permeability reduces the cycle hydrogen absorption and desorption performance of hydrogen absorbing materials in impurity gases, which is manifested as a reduction in the cycle life of materials

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