Heterogeneous Zeolite Membrane for CO2 Separation
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Solution Overview
Problem
Conventional zeolite membranes with DDR structure face challenges in reproducibility and low carbon dioxide/nitrogen separation performance due to difficulties in synthesizing uniform DDR seed particles, limiting their industrial application.
Innovation Solution
A heterogeneous zeolite membrane is developed by using CHA structure zeolite particles as seeds and growing them into a DDR structure, achieving high CO2/N2 and CO2/CH4 separation performance through hydrothermal synthesis, even under wet conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If DDR seed particles are synthesized using conventional methods, then DDR zeolite membranes can be produced, but the synthesis is complicated and poorly reproducible with limited particle size control
Solution Approach 1:
CHA structure zeolite particles are used as intermediary seed particles to grow DDR structure zeolite membranes. This intermediary approach avoids the need to directly synthesize uniform DDR seed particles, thereby resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
Instead of synthesizing DDR structure particles directly and growing the same structure thereon, the invention inverts the approach by using CHA structure particles as seeds to grow DDR structure membranes. This inversion simplifies the seed particle synthesis while achieving the desired membrane structure.
2Reliability
If DDR structure zeolite membranes are produced using conventional seed growth method, then membranes can be formed, but separation performance is very low
Solution Approach 1:
The invention changes the crystal structure parameter of the seed particles from DDR to CHA structure, while maintaining the seed growth method. This parameter change results in dramatically improved CO2/N2 separation performance while preserving reproducible membrane production.
3Productivity
If heterogeneous zeolite membrane is produced by growing DDR structure on CHA structure seeds, then CO2/N2 separation performance is improved, but the crystal structures differ between seed and membrane
Solution Approach 1:
The invention creates a composite zeolite membrane with heterogeneous crystal structures (CHA seeds + DDR membrane layer). This composite structure combines the advantages of both structures, achieving high CO2 separation performance while maintaining structural stability through the seed growth mechanism.
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 exhibits superior CO2/N2 and CO2/CH4 separation performance compared to conventional zeolite membranes, with high reproducibility and stability, making it suitable for industrial carbon dioxide capture and separation applications.
Implementation Method 1
producing a DDR@CHA heterogeneous zeolite membrane by performing hydrothermal synthesis on the support having the seed layer in the presence of a DDR precursor solution
Implementation Method 2
growing them into a DDR structure
Implementation Method 3
zeolite membranes have high potential for use in distinguishing minute differences in the shape and size of permanent gases, thus achieving energy-efficient gas separation
Implementation Method 4
separate CO2/N2 and CO2/CH4 even under wet conditions
Data Source
AI summary
Disclosed are a heterogeneous zeolite membrane and a method of preparing the same, and more particularly a heterogeneous zeolite membrane that has CHA and DDR zeolite structures by growing seed particles into a crystal structure different from that of the zeolite membrane and can thus separate CO2/N2 and CO2/CH4 even under wet conditions, a method of preparing the same, and a method of capturing and removing carbon dioxide using the membrane.