Oriented SAT-Type Zeolite Membrane for Gas Separation
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Solution Overview
Problem
Existing SAT-type zeolite membrane complexes lack orientation, which hinders their performance as gas separation membranes and in other applications involving molecular permeation or adsorption.
Innovation Solution
A method involving hydrothermal synthesis to form an oriented SAT-type zeolite membrane on a porous support, where seed crystals are deposited and grown using a starting material solution with a pH between 5 and 9, ensuring the zeolite membrane has a peak intensity ratio of 2θ=13.9° to 2θ=8.5° in X-ray diffraction patterns, indicating proper orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If zeolite powder is synthesized by conventional hydrothermal synthesis and applied on a porous substrate, then a zeolite membrane can be formed, but the zeolite membrane lacks orientation and cannot achieve high gas separation performance
Solution Approach 1:
The invention applies seed crystals to the porous substrate before the main hydrothermal synthesis process. These seed crystals serve as nucleation sites that guide the orientation of subsequently grown zeolite crystals, ensuring they align with the substrate surface. This preliminary action of seeding resolves the contradiction by establishing the desired orientation structure before bulk zeolite growth occurs, enabling both high manufacturing precision (orientation) and reliability (gas separation performance).
Solution Approach 2:
The invention introduces seed crystals as an intermediary between the substrate and the bulk zeolite growth. These seed crystals act as a mediating layer that transfers the orientational information from the substrate to the growing zeolite membrane. The seed crystals facilitate controlled epitaxial growth, resolving the contradiction by providing a intermediate structure that ensures proper orientation while enabling high-performance gas separation.
2Manufacturing precision
If conventional hydrothermal synthesis is used without pH control, then the synthesis process is simple, but the zeolite membrane does not achieve proper orientation and binding properties
Solution Approach 1:
The invention specifically controls the pH parameter of the hydrothermal synthesis solution within the range of 5-9, and maintains the pH of the starting material solution between 4-5. This parameter control influences the nucleation and growth kinetics of zeolite crystals, promoting oriented growth on the substrate. By adjusting this chemical parameter, the invention achieves proper crystal orientation without significantly complicating the overall synthesis process, resolving the contradiction between manufacturing precision and device complexity.
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 oriented SAT-type zeolite membrane complex achieves enhanced gas separation performance and denseness, suitable for various applications due to the alignment of microspore aperture planes, improving binding properties and separation efficiency.
Implementation Method 1
the alignment of microspore aperture planes, improving binding properties and separation efficiency
Implementation Method 2
enhanced gas separation performance and denseness, suitable for various applications due to the alignment of microspore aperture planes, improving binding properties and separation efficiency
Data Source
AI summary
A zeolite membrane complex comprises: a support; and a zeolite membrane formed on the support. The membrane is of SAT-type zeolite, and in an X-ray diffraction pattern obtained by X-ray irradiation to the zeolite membrane, a peak intensity around 2θ=13.9° is 1.5 times or more a peak intensity around 2θ=8.5°.