SAT-Type Zeolite Membrane Orientation Control
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Solution Overview
Problem
Existing SAT-type zeolite membranes lack orientation, which hinders their performance in applications such as gas separation and molecular adsorption due to uncontrolled particle aspect ratios and interstice formation.
Innovation Solution
A method to produce a zeolite membrane complex with an SAT-type zeolite membrane formed on a porous support, where particles with aspect ratios between 1.2 and 10 account for 85% of the surface area, achieved by synthesizing seed crystals, depositing them on the support, and growing the zeolite membrane in a controlled hydrothermal synthesis process with a pH-adjusted starting material solution, ensuring high orientation and reduced interstices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrothermal synthesis is used to form SAT-type zeolite membrane, then the membrane can be formed on the support, but the zeolite particles lack orientation and have uncontrolled aspect ratios
Solution Approach 1:
The patent applies preliminary action by preparing oriented seed crystals before the main membrane formation process. These pre-oriented seeds are deposited on the support surface, establishing a template that guides subsequent zeolite growth to achieve uniform orientation and controlled aspect ratios without complicating the overall synthesis procedure
Solution Approach 2:
The patent utilizes parameter changes by adjusting the aspect ratio of seed crystals through controlled synthesis conditions (temperature, time, composition ratios). By varying these parameters, the invention achieves optimal particle morphology with aspect ratios between 1.2-10, which directly improves membrane orientation and separation performance
2Reliability
If zeolite powder is applied on support and immersed in synthesis sol, then a zeolite membrane can be formed by hydrothermal synthesis, but interstices form between particles reducing separation performance
Solution Approach 1:
The patent applies composite materials by creating a hierarchical structure where oriented zeolite particles with controlled aspect ratios are densely packed on the support. This composite arrangement, achieved through seed crystal templating, reduces interstices between particles while maintaining membrane porosity for selective separation, thereby improving both denseness and separation performance
Solution Approach 2:
The patent applies local quality by ensuring uniform orientation and dense packing of zeolite particles across the membrane surface. The controlled aspect ratio and orientation of individual particles create a consistent local structure that eliminates defects and interstices, leading to improved overall membrane reliability for separation applications
3Productivity
If unoriented zeolite membrane is used, then the membrane structure is simple to form, but gas separation performance is poor
Solution Approach 1:
The patent applies preliminary action by pre-orienting seed crystals before membrane formation. This preliminary orientation step establishes a structured template that guides subsequent zeolite growth, achieving high gas separation efficiency through oriented particle arrangement without requiring complex in-situ control mechanisms during synthesis
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 resulting zeolite membrane complex exhibits improved orientation and denseness, enhancing its separation performance and binding properties, making it suitable for high-performance gas separation and other applications.
Implementation Method 1
various structures of zeolites are known, and three letters of the alphabet are assigned as a code indicating each structure by the International Zeolite Association. One of the structures of zeolites is an SAT-type structure... with respect to SAT-type zeolites... for specific gas separation or molecular adsorption
Implementation Method 2
using the zeolite membranes in applications such as specific gas separation or molecular adsorption
Data Source
AI summary
A zeolite membrane complex includes a support and a zeolite membrane formed on the support. The zeolite membrane is of an SAT-type zeolite. Among particles on the surface of the zeolite membrane, particles that have aspect ratios higher than or equal to 1.2 and lower than or equal to 10 account for 85% or more of the area of the surface of the zeolite membrane. This improves the orientations of the particles and also reduces the interstices among the particles. As a result, the denseness of the zeolite membrane is improved. Accordingly, for example, high gas separation performance can be obtained when the zeolite membrane complex is used as a gas separation membrane.