Porous Spherical Coating Material for Three-Way Catalytic Converters
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Solution Overview
Problem
Existing coating materials for three-way catalytic converters have a complicated preparation process and low specific surface area, which limits their efficiency in treating exhaust gases.
Innovation Solution
A method using aluminum salt and silicon source precursors, combined with hydrothermal crystallization and calcination treatments under a template agent, to create a porous spherical silicon-aluminum oxide composite with a high specific surface area, simplifying the preparation process and increasing the catalytic area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional coating materials are used to increase catalytic area, then the specific surface area is limited, but the preparation process becomes complicated
Solution Approach 1:
The patent employs a porous spherical structure as the coating material, where the porous architecture provides extremely high specific surface area (up to 908.6 m2/g) while maintaining a simple preparation process. The porous structure is formed through hydrothermal crystallization of aluminum salt and silicon source precursors, creating a material that simultaneously achieves high surface area and process simplicity.
Solution Approach 2:
The coating material is composed of aluminum salt and silicon source precursors forming a composite spherical structure. This composite approach allows the material to achieve high specific surface area through the synergistic combination of aluminum and silicon components, while the unified composite structure simplifies the preparation process compared to multi-layer or multi-component conventional coatings.
2Ease of manufacture
If conventional coating materials are used, then the preparation process is simple, but the catalytic efficiency is limited due to low specific surface area
Solution Approach 1:
The porous spherical coating material provides an extremely high specific surface area of up to 908.6 m2/g, which directly enhances catalytic efficiency by providing more active sites for exhaust gas treatment. The porous structure is achieved through a simple hydrothermal crystallization process followed by calcination, maintaining ease of manufacture while dramatically improving catalytic performance.
Solution Approach 2:
The patent changes the physical and chemical parameters of the coating material by controlling the hydrothermal crystallization conditions (temperature, time, pH) and precursor ratios. These parameter changes transform the material into a porous spherical structure with optimized specific surface area, thereby enhancing catalytic efficiency while keeping the preparation process straightforward through parameter optimization rather than process 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 method results in a coating material with a specific surface area up to 908.6 m2/g, enhancing the catalytic efficiency of the three-way catalytic converter by increasing the catalytic area and reducing the need for rare earth materials, thus improving exhaust gas treatment efficiency.
Implementation Method 1
performing hydrothermal crystallization and calcination treatments successively under an action of a template agent to obtain the coating material
Implementation Method 2
performing the calcination treatment on the solid product to remove the template agent in the solid product
Data Source
AI summary
Provided is a preparation method of a coating material. The method includes: using an aluminum salt and a silicon source as precursors; and performing hydrothermal crystallization and calcination treatments successively under an action of a template agent to obtain the coating material, wherein the template agent is used to cause the coating material to form a porous spherical structure. In the embodiments of the present disclosure, the preparation process of the coating material is simple and the cost is low, and the specific surface area of the prepared coating material is large.