BCC Alloy Hydrogen Separation Membrane for High-Temperature Durability
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Solution Overview
Problem
Current hydrogen separation membranes face challenges with high unit costs and low permeability, as well as durability issues due to hydrogen embrittlement and crystallization at high temperatures, limiting their commercialization and effectiveness.
Innovation Solution
A separation membrane with a body-centered cubic (BCC) crystal structure alloy comprising Group 5 elements like V, Nb, or Ta, combined with Iridium (Ir) and optionally additional metals like Zr, Cu, Y, Ni, or Al, which reduces hydrogen solubility and embrittlement, and includes a catalyst layer for enhanced hydrogen permeability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Pd-based metals are used for hydrogen separation membranes, then hydrogen selectivity is improved, but unit cost increases and permeability decreases
Solution Approach 1:
The patent changes the crystal structure parameter from FCC to BCC and modifies alloy composition by adding Group 5 elements and Ir, achieving high hydrogen permeability and selectivity with lower cost materials
Solution Approach 2:
The patent creates composite alloy materials combining Group 5 elements (V, Nb, Ta) with Ir and other metals to achieve superior hydrogen separation performance that balances selectivity, permeability, and cost
2Ease of manufacture
If amorphous metal separation membranes are used, then manufacturing process is simplified, but durability decreases due to crystallization at high temperatures
Solution Approach 1:
The patent changes the crystal structure from amorphous to BCC, providing thermal stability and preventing crystallization at high operating temperatures while maintaining manufacturing feasibility through controlled alloy composition
Solution Approach 2:
The patent develops BCC alloy membranes that are more stable and durable than amorphous membranes, reducing the need for frequent replacement despite potentially higher initial manufacturing complexity
3Ease of manufacture
If porous separation membranes are used, then manufacturing is easier, but gas selectivity decreases due to difficulty in controlling pore size and shape
Solution Approach 1:
The patent transitions from porous structures to non-porous BCC alloy materials, achieving high gas selectivity through the inherent properties of the crystalline structure rather than relying on pore geometry control
Solution Approach 2:
The patent uses the interstitial sites within the BCC lattice structure to selectively separate hydrogen based on atomic size and diffusion properties, replacing pore-based separation mechanisms
4Productivity
If membranes are used at high temperatures (250-500°C), then hydrogen permeability is improved, but durability decreases due to hydrogen embrittlement and crystallization
Solution Approach 1:
The patent changes the crystal structure to BCC and optimizes alloy composition to simultaneously achieve high hydrogen permeability at elevated temperatures while maintaining structural stability and resistance to hydrogen embrittlement
Solution Approach 2:
The patent converts the potential harm of high-temperature operation into benefit by selecting BCC alloy materials that become more stable and selective at elevated temperatures, turning thermal stress into enhanced performance
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 membrane achieves high hydrogen permeability and improved durability, maintaining performance at high temperatures while inhibiting hydrogen embrittlement and crystallization, thus offering a cost-effective and efficient hydrogen separation solution.
Implementation Method 1
Hydrogen can be selectively separated by hydrogen dissolution and diffusion into the interstitial sites of the FCC lattice of Pd
Implementation Method 2
Hydrogen can be selectively separated by hydrogen dissolution and diffusion into the interstitial sites of the FCC lattice of Pd
Implementation Method 3
A hydrogen separation membrane including the separation membrane, and a catalyst layer on the separation membrane
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Disclosed is a separation membrane including an alloy including a Group 5 element and Ir, wherein the alloy includes a body centered cubic crystal structure.