Pd Membrane Preparation via Sealing Layer
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Solution Overview
Problem
Existing methods for preparing hydrogen separation membranes using palladium or palladium alloys face challenges such as pinhole formation and reduced hydrogen permeability due to palladium plating inside porous supports, which affects mechanical strength and membrane performance.
Innovation Solution
A method involving an electroless plating process with a sealing layer on the opposite surface of the porous support to prevent plating solution penetration, allowing a Pd-containing membrane to grow uniformly from the top surface, thereby preventing palladium plating on the support and shielding layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electroless plating is performed without sealing the porous support, then the plating process is simple, but Pd plates inside the porous support and shielding layer causing pinhole formation and reduced hydrogen permeability
Solution Approach 1:
The patent divides the porous support into two distinct surfaces: a sealed lower surface that prevents plating solution penetration, and an upper surface that allows controlled Pd deposition. This segmentation enables the plating process to occur only where desired, preventing Pd from plate inside the support structure while maintaining process simplicity
Solution Approach 2:
The patent introduces a sealing layer as an intermediary substance applied to the lower surface of the porous support. This sealing layer acts as a barrier that prevents the plating solution from penetrating into the support pores, thereby stopping unwanted Pd deposition inside the support while allowing the plating process to proceed on the upper surface
2Strength
If Pd membrane thickness is increased to improve mechanical strength, then mechanical strength improves, but hydrogen permeability decreases
Solution Approach 1:
The patent applies different properties to different parts of the membrane structure: the support and shielding layer provide mechanical strength, while the Pd layer on the upper surface provides hydrogen permeability. By confining Pd deposition to only the upper surface through sealing the lower surface, the membrane achieves adequate strength from the support structure without sacrificing permeability through excessive Pd thickness
3Reliability
If Pd layer is made thinner to improve hydrogen permeability, then hydrogen permeability improves, but pinhole formation increases
Solution Approach 1:
The patent extracts or removes the harmful effect of unwanted Pd deposition from the system by sealing the lower surface of the porous support. This prevents the plating solution from penetrating into the support and creating defective Pd deposits, allowing for controlled deposition only on the upper surface where uniform, pinhole-free layers can be formed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances hydrogen permeability by maintaining membrane thickness and active area, reducing nitrogen leaks, and ensuring stable operation at high temperatures.
Implementation Method 1
a fourth step of forming a Pd-containing dense membrane from the Pd-containing particles of the Pd-containing layer by immersing the porous support provided with the Pd-containing layer on the first surface and the sealing layer on the second surface in a Pd-containing electroless plating solution
Implementation Method 2
a third step of introducing a sealing layer that blocks the absorption of an electroless plating solution on a second surface of the porous support
Implementation Method 3
the adsorbed hydrogen molecules are dissociated, and after the dissociated hydrogen atoms (H) are diffused through the Pd metal membrane lattice, hydrogen molecules are regenerated
Implementation Method 4
when a metal separation membrane is directly formed on the surface of a porous support made of metals among porous supports, hydrogen permeability may be reduced due to mutual diffusion, therefore, a shielding layer made of ceramic is placed between the porous support and the metal separation membrane
Data Source
AI summary
The present invention relates to a method for preparing a hydrogen separation membrane capable of preventing the plating of Pd inside a porous support and a porous shielding layer when a separation membrane is prepared; a hydrogen separation membrane prepared therefrom; and a use thereof. In addition, the present invention relates to a device for preparing a hydrogen separation membrane; and a method for preparing a hydrogen separation membrane using the device, and in particular, relates to a device for preparing a hydrogen separation membrane capable of stably growing a Pd-containing separation membrane for hydrogen gas separation as a plating solution grows from the upper surface of a porous support to a uniform thickness by simply shielding the lower surface of the porous support when a hydrogen separation membrane is prepared using an electroless plating method. Furthermore, the present invention relates to a device for preparing a hydrogen separation membrane, and in particular, relates to a device for preparing a hydrogen separation membrane capable of stably growing a composite membrane for hydrogen gas separation as a plating solution grows from the top of a porous support to a uniform thickness by simply shielding the bottom of the porous support.