Aluminum Borate Catalyst Layer for High-Temperature Exhaust Purification
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Solution Overview
Problem
Current exhaust gas purification catalyst systems, despite using aluminum borate as a carrier, face challenges in meeting increasingly stringent regulations for removing CO, HC, and NOx from automobile exhaust gases, particularly under high-temperature conditions.
Innovation Solution
A multi-layer exhaust gas purification catalyst system is employed, with a lower layer containing aluminum borate modified with La2O3 and having a specific aluminum oxide to boron oxide ratio, and a noble metal like Pd supported on the carrier, enhancing CO, HC, and NOx removal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional aluminum borate is used as catalyst carrier, then manufacturing cost is reduced, but catalytic performance for removing CO, HC, and NOx deteriorates under high-temperature conditions
Solution Approach 1:
The invention changes the chemical composition parameters of the aluminum borate carrier by controlling the Al2O3/B2O3 ratio within 9:1 to 10:2 and modifying with La2O3 at 0.3 to 2 mass%, thereby optimizing both manufacturing feasibility and catalytic performance under high-temperature conditions
Solution Approach 2:
The invention creates a composite catalyst carrier by combining aluminum borate with lanthanum oxide (La2O3) modification, achieving synergistic effects that improve catalytic activity and thermal stability while maintaining cost-effectiveness
2Stability of the object's composition
If aluminum borate with high heat resistance is used, then thermal stability is improved, but gas diffusivity and catalytic contact efficiency deteriorate
Solution Approach 1:
The invention optimizes the Al2O3/B2O3 ratio parameter within 9:1 to 10:2 and La2O3 content at 0.3 to 2 mass%, which balances thermal stability with gas diffusivity and catalytic contact efficiency by controlling the pore structure and surface area
3Reliability
If multi-layer catalyst structure with aluminum borate lower layer is implemented, then CO, HC, and NOx removal performance is improved, but device complexity increases
Solution Approach 1:
The invention divides the catalyst into functional layers with the aluminum borate-modified layer positioned in the high-temperature front section and other catalyst layers in the rear section, assigning specific functions to each layer to improve overall purification performance
Solution Approach 2:
The invention applies different catalyst compositions to different spatial locations - the front section near the engine uses aluminum borate modified with La2O3 for high-temperature resistance, while the rear section uses conventional catalyst formulations optimized for lower-temperature operation
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 system exhibits improved long-term exhaust gas purification performance under high-temperature conditions, with enhanced CO, HC, and NOx removal capabilities, maintaining effectiveness even after prolonged use.
Implementation Method 1
a catalyst carrier made of aluminum borate is used. In one case of such a catalyst, a catalyst component is deposited on a powder compact whose particles are covered with aluminum borate whiskers and include voids therein, whereby gas diffusivity is enhanced
Data Source
AI summary
In an exhaust gas purification catalyst system for use in an automobile including an exhaust gas purification catalyst product disposed in both a front section and a rear section, the exhaust gas purification catalyst product of the front section has a layered catalyst including a lower layer which contains aluminum borate.