The hydrogen separation filter includes a porous substrate and a super lattice layer on the porous substrate. The super lattice layer includes at least one lattice expansion layer containing a first material and at least two hydrogen dissociation and permeation layers containing a second material selected from the group consisting of Pd, V, Ta, Ti, Nb, and alloys thereof. The at least one lattice expansion layer and the at least two hydrogen dissociation and permeation layers are alternately stacked. The first material and the second material have a same crystalline structure. A lattice constant a.sub.1,bulk of a first bulk material haying a same composition and a same crystalline structure as the first material and a lattice constant a.sub.2,bulk of a second bulk material having a same composition and a same crystalline structure as the second material satisfy Formula (1):
1.03a.sub.2,bulka.sub.1,bulk1.15a.sub.2,bulk(1).

A target palladium membrane selection method, a hydrogen-related reaction execution method, and an osmosis diffusion rate determination method and system are provided. The selection method includes determining target lattice parameters of the target palladium membrane, and target metal components and proportions thereof according to a target osmosis diffusion rate of hydrogen gas passing through a target palladium membrane, a target thickness of the target palladium membrane, and a corresponding relationship between the permeation diffusion rate of hydrogen gas passing through a sample palladium membrane and a specific parameter group of the sample palladium membrane; and selecting as a target palladium membrane a palladium membrane having the target lattice parameters, the target metal components and proportions thereof, and the target thickness.

A composite palladium-based alloy material, a preparation method therefor, and a use thereof are provided. The composite palladium-based alloy material includes Pd and a group IB metal. In an XRD graph of the composite palladium-based alloy material, the full width at half maximum of at least one characteristic peak for 2 within the range of 5-90 is less than or equal to 0.1745. The composite palladium-based alloy material has a lower activation energy for hydrogen permeation, a higher hydrogen permeation efficiency, higher stability and carbon deposition resistance, and has a longer service life as a composite membrane (especially in hydrogen production via steam reforming).

An apparatus includes a porous substrate and a multi-layer membrane. The porous substrate has a pore structure configured to allow diffusion of hydrogen molecules through the porous substrate. The multi-layer membrane is configured to, in response to contacting a hydrogen molecule present in the gas stream, split the hydrogen molecule into at least one of hydrogen atoms or protons. The multi-layer membrane is configured to allow passage of the hydrogen atoms or protons through the multi-layer membrane while blocking passage of compounds that may be present in the gas stream that are larger than hydrogen molecules. The hydrogen atoms or protons, after passing through the multi-layer membrane, combine to reform the hydrogen molecule. The multi-layer membrane includes a first metallic layer, an intermediate layer, and a second metallic layer.

The invention relates to a coupling device for a tube having a Palladium-based membrane deposited thereon, for use in separation and purification of hydrogen in a hydrogen separator or reactor. The coupling device has an inlet for gas and configured to couple said tube to the inlet; a body part with a cylindrical opening for receiving the tube and for receiving gas flow to the inlet; a nut, the body part and the nut being configured such that the nut can be screwed onto the body part at the opening; a stack of at least two sealing rings. The body part, the nut and sealing rings are configured such that the tube extends through an axial end portion of the nut, the sealing rings into the opening such that, in use, the sealing rings are compressed axially as a result of screwing the nut onto the body part so that the sealing rings sealingly engage the tube.