Channeled Ceramic Membrane Oxygen Permeation
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Solution Overview
Problem
Conventional Ion Transport Membranes (ITMs) face limitations in oxygen permeation due to slow oxygen permeation rates, primarily attributed to bulk diffusion resistance and the need for adequate mechanical strength, which restricts membrane thickness and efficiency in gas separation processes.
Innovation Solution
A method involving the use of a template to control the formation of spaced channels in ceramic membranes through phase inversion, allowing for precise control of channel geometry and reducing oxygen ion diffusion distance, thereby enhancing oxygen permeation flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If membrane thickness is reduced to improve oxygen permeation flux, then oxygen bulk diffusion distance is shortened and permeation flux increases, but mechanical strength becomes insufficient
Solution Approach 1:
The membrane is segmented into a dense functional layer and a porous support layer with microchannels. The dense layer (10-100 μm) provides oxygen separation functionality, while the porous support layer (0.5-5 mm) with vertically aligned microchannels provides mechanical strength and facilitates oxygen transport. This segmentation allows the thin dense layer to achieve high permeation flux while the thicker porous support maintains structural integrity.
Solution Approach 2:
The invention introduces a vertical dimension for oxygen transport through the porous support layer by creating vertically aligned microchannels. Instead of relying solely on horizontal diffusion through a thick dense layer, oxygen can transport vertically through the channel structure, effectively reducing the diffusion path length while maintaining overall membrane thickness for mechanical strength.
2Strength
If membrane thickness is increased to ensure adequate mechanical strength, then structural integrity is maintained, but oxygen bulk diffusion distance increases and permeation flux decreases
Solution Approach 1:
The support layer is designed as a porous material with controlled porosity (30-70%) and vertically aligned microchannels. This porous structure provides mechanical strength comparable to solid material while offering low-resistance pathways for oxygen transport. The porosity allows oxygen to diffuse through the support layer with minimal resistance, effectively decoupling the relationship between membrane thickness and diffusion distance.
3Quantity of substance
If conventional phase inversion is used to create porous structures, then porosity is achieved, but multiple dense layers form which are unfavorable for oxygen permeation
Solution Approach 1:
A template (such as a mesh or fibrous mat) is placed in the slurry before phase inversion to pre-determine the pore structure. The template guides the formation of a single continuous porous layer with vertically aligned channels, preventing the random formation of multiple dense skin layers. After sintering, the template is removed, leaving a controlled porous structure optimized for oxygen transport.
Solution Approach 2:
The template acts as an intermediary during the phase inversion process, mediating the formation of the porous structure. The template's geometry (mesh size, fiber arrangement) directly controls the pore size, shape, and alignment in the final membrane. This intermediary approach ensures consistent single-layer porous structure formation without requiring complex process control.
4Stability of the object's composition
If high sintering temperatures are used to obtain dense layers in supported membranes, then dense layer formation is achieved, but porous support porosity decreases and gas diffusion resistance increases
Solution Approach 1:
The membrane is designed as a composite structure with a dense functional layer (containing oxygen-ion conducting ceramics) and a porous support layer (containing structurally stable ceramics). The two layers have different porosity and density characteristics optimized for their respective functions. The dense layer provides oxygen separation while the porous support provides mechanical strength and transport pathways, allowing high sintering temperatures without compromising overall porosity.
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 method significantly improves oxygen permeation flux by up to 7 times compared to conventional dense membranes of similar thickness, achieving flux rates within the range of 2-12 ml.cm^-2.min^-1 at 1050°C, while maintaining mechanical strength and thermal stability.
Implementation Method 1
A method involving the use of a template to control the formation of spaced channels in ceramic membranes through phase inversion
Implementation Method 2
In ITMs, the separation of gases is based on ion conduction, where particular gases may be selectively transported across the ceramic material in the form of ionic flux
Implementation Method 3
Oxygen exchange at the membrane surface and bulk diffusion within the dense membrane are considered to be the major rate-limiting steps of oxygen permeation through ITMs
Data Source
AI summary
An article with a body having spaced channels created at a surface of the body and extending into the body, wherein the channels are located at controlled spaced locations. The channeled or microchanneled articles may be in the form of channeled or microchanneled membranes or otherwise. Methods of manufacturing channeled articles and uses of the channeled articles are described.