Composite Membrane With Embedded Active Layer For Hydrogen Separation
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Solution Overview
Problem
Existing composite membranes for hydrogen (H2) separation face challenges such as high cost, poor mechanical integrity, and limited reliability due to thin metal layers, which are prone to thermal cycling and mechanical damage, and have issues with adhesion and sealing, hindering their widespread application in fuel cells and separation processes.
Innovation Solution
A composite membrane design featuring a porous support structure with active layers disposed within the pores, utilizing anodic aluminum oxide as the support and incorporating thin active layers of materials like Pd or its alloys, which are embedded at a predetermined position within the support structure to enhance mechanical strength and adhesion, and a metal rim for sealing and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thin metal layers are used to increase membrane flux, then productivity is improved, but reliability deteriorates due to poor mechanical integrity and susceptibility to damage
Solution Approach 1:
The patent uses a composite membrane structure consisting of a porous support layer (providing mechanical strength) combined with a thin active metal layer (providing separation functionality). This composite approach allows the membrane to achieve high flux through the thin active layer while the robust porous support maintains mechanical integrity and resistance to thermal cycling and mechanical damage.
2Productivity
If thin active layers are deposited onto porous support, then membrane flux is improved, but adhesion deteriorates leading to poor reliability
Solution Approach 1:
The patent employs a porous support structure with controlled pore size and distribution that provides both mechanical strength and excellent adhesion for the thin active metal layer. The porous structure increases the surface area for adhesion while maintaining structural integrity, allowing thin active layers to be firmly attached without delamination during thermal cycling or mechanical operation.
3Reliability
If Pd thickness is increased to 10-50 μm to ensure defect-free structure, then reliability is improved, but productivity deteriorates due to reduced flux
Solution Approach 1:
The patent transitions from relying solely on increasing Pd thickness in one dimension to achieve defect-free structure, to using a two-dimensional porous support architecture that provides mechanical strength and defect tolerance. This dimensional approach allows ultra-thin Pd layers (much thinner than 10-50 μm) to function reliably by distributing stress and preventing defect propagation through the porous network.
4Adaptability or versatility
If membranes are subjected to thermal cycling and mechanical loads, then operational versatility is improved, but mechanical integrity deteriorates
Solution Approach 1:
The patent designs the porous support structure with optimized parameters including pore size, porosity, and wall thickness to withstand thermal cycling and mechanical loads. The porous architecture provides thermal expansion accommodation and mechanical flexibility, allowing the membrane to maintain integrity under varying operational conditions including temperature changes and pressure differentials.
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
The solution significantly increases hydrogen flux while maintaining high permselectivity and resistance to thermal cycling and mechanical loads, providing a more reliable and cost-effective membrane solution for hydrogen separation applications.
Implementation Method 1
one or more active layers disposed within the pores of the support structure... the active layer is permeable to only species that are desired to go through the membrane
Implementation Method 2
the composite membrane has improved resistance to thermal cycling... providing a more reliable and cost-effective membrane solution
Data Source
AI summary
Composite membranes that are adapted for separation, purification, filtration, analysis, reaction and sensing. The composite membranes can include a porous support structure having elongate pore channels extending through the support structure. The composite membrane also includes an active layer comprising an active layer material, where the active layer material is completely disposed within the pore channels between the surfaces of the support structure. The active layer is intimately integrated within the support structure, thus enabling great robustness, reliability, resistance to mechanical stress and thermal cycling, and high selectivity. Methods for the fabrication of composite membranes are also provided.