Hydrogen separating composite metal film with inlaid structure

Abstract

The invention is named a hydrogen separating composite metal film with an inlaid structure, belonging to the field of the novel energy chemical industry. For the hydrogen separating composite metal film with the inlaid structure, metal palladium or palladium alloy (3) is subjected to combination with a substrate of high-hydrogen-seeping compact metals such as tantalum and vanadium by using associated techniques, so as to form a layer of metal oxidization protection film on the surfaces of the easily oxidized metals such as tantalum and vanadium to prevent the surface of the substrate from forming an oxidization layer (2), thereby forming the structural effect of hydrogen separation and purification. The film is characterized in that the metal palladium or palladium alloy particles can break through the oxidization layer on the surface of the substrate of metals such as tantalum and vanadium by using associated techniques, so as to be partially embedded in the substrate, so that the hydrogen separating metal film with a special inlaid structure is formed.

Description

technical field [0001] The technical name of the present invention is mosaic structure composite metal hydrogen separation membrane, which belongs to the field of new energy chemical industry. Used to extract high-purity hydrogen. Background technique [0002] Currently, thermochemical methods are mainly used to directly convert hydrocarbon fuels such as coal, gasoline, diesel and natural gas into mixed fuels containing certain hydrogen components. However, currently fuel cell, chemical, electronic processing and other industries require high-purity hydrogen, so the hydrogen purification step is very important. At present, metal separation membranes at home and abroad use electroplating, sputtering, physical vapor deposition and other methods to deposit palladium or palladium alloys on the two surfaces of metal substrates such as tantalum and vanadium from which the oxide layer has been removed. Catalytic decomposition material and base material oxidize the protect...

AI Technical Summary

Problems solved by technology

However, on the one hand, the preparation conditions for the preparation of metal-hydrogen separation membranes using these traditional methods are relatively harsh. It is necessary to remove the dense oxide film on the metal surface and then deposit a layer of palladium or palladium alloy film.

On the other hand, after long-term repeated high and low temperature operation, the metal-hydrogen separation membrane with sandwich-type flat plate structure will cause thermal stress concentration due to inconsistent thermal expansion coefficients between different metal materials, resulting in cracks in the palladium and palladium alloy deposition layers. , separation from the substrate material, or even falling off, etc., and finally the unprotected base material is rapidly oxidized under high temperature conditions, forming a dense oxide layer that is difficult for hydrogen atoms to penetrate; in addition, in the spallation process of the oxide after the substrate material is oxidized , will aggravate the shedding of the catalytic protective layer, further deteriorating the hydrogen permeation characteristics of this composite metal separation membrane

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