AFX Zeolite Membrane Orientation for Gas Separation
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Solution Overview
Problem
There is no reported success in forming practicable zeolite membranes with an AFX structure, which are needed for effective gas and liquid separation applications.
Innovation Solution
A zeolite membrane with an AFX structure is developed, comprising a porous support and AFX crystals with a specific orientation and composition, where the peak intensity of the (110) plane is 2.5 times or more than the peak intensity of the (004) plane in an X-ray diffraction pattern, enhancing the connectivity and separation performance of the membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zeolite membrane structures (DDR, LTA, FAU, MFI, CHA) are used, then gas separation and liquid separation performance are achieved, but AFX structure membranes cannot be formed
Solution Approach 1:
The patent changes the crystallographic orientation parameters of AFX crystals by controlling the deposition process to achieve specific orientation relationships between the AFX (001) plane and the support surface, enabling successful membrane formation with the previously unformable AFX structure
Solution Approach 2:
The patent creates a composite membrane structure consisting of AFX crystals deposited on a porous support, combining the separation properties of AFX zeolite with the mechanical strength of the support to achieve both formability and functional performance
2Reliability
If AFX crystals are formed on porous support, then membrane structure is achieved, but practicable denseness and separation performance are not obtained
Solution Approach 1:
The patent optimizes deposition parameters including temperature (100-200°C), time (1-48 hours), and solution composition to control crystal growth and orientation, achieving the required (110) peak intensity ratio of 2.5 or more while ensuring practicable denseness
Solution Approach 2:
The patent applies preliminary treatment to the porous support surface before AFX crystal deposition, creating a prepared surface that promotes proper crystal orientation and growth, ensuring both manufacturability and separation 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 developed AFX membrane exhibits improved separation performance, as demonstrated by increased permeance ratios in gas separation tests, achieving a practicable level of denseness and durability.
Implementation Method 1
a method for manufacturing a membrane structure, comprising: forming AFX crystals on a porous support
Implementation Method 2
forming AFX crystals on a porous support wherein the AFX crystals have a specific orientation
Implementation Method 3
in an X-ray diffraction pattern obtained by irradiation of X-rays to a membrane surface
Implementation Method 4
in an X-ray diffraction pattern obtained by irradiation of X-rays to a membrane surface
Implementation Method 5
techniques for separating and concentrating desired components from a gas mixture or a liquid mixture using zeolite membranes
Implementation Method 6
zeolite membranes for gas separation, for example... zeolite membranes for liquid separation
Data Source
AI summary
A peak intensity of a (110) plane is greater than or equal to 2.5 times a peak intensity of a (004) plane in an X-ray diffraction pattern obtained by irradiation of X-rays to a membrane surface of the AFX membrane.