Exhaust Catalyst Composite Phosphate Support Y3PO7
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Solution Overview
Problem
Conventional catalysts for exhaust gas purification face issues with heat resistance and purification performance, particularly those using AlPO4 compounds with a berlinite crystal structure and small BET specific surface area.
Innovation Solution
A catalyst with a composite phosphate catalyst support consisting of Y3PO7 or Y8P2O17, which enhances catalytic activity and heat resistance by increasing the yttrium to phosphorus molar ratio, supporting noble metals like platinum, palladium, or rhodium for improved exhaust gas purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AlPO4 compounds with berlinite crystal structure are used as catalyst support, then the catalyst can be manufactured with conventional processes, but the heat resistance and purification performance are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the catalyst support by using YPO4 instead of conventional AlPO4 compounds. This parameter change results in improved heat resistance and purification performance while maintaining compatibility with conventional manufacturing processes
Solution Approach 2:
The invention uses composite materials by combining YPO4 with specific promoters (such as rare earth elements or transition metals) to create a catalyst support that achieves both superior heat resistance and purification performance while remaining manufacturable with conventional processes
2Reliability
If AlPO4 compounds with small BET specific surface area are used, then the catalyst structure is simple, but the purification performance is inferior
Solution Approach 1:
The invention changes the material composition from AlPO4 to YPO4, which inherently provides a larger BET specific surface area. This parameter change directly improves purification performance by increasing the active surface area available for catalytic reactions
3Reliability
If YPO4 is used as catalyst support, then the catalyst has basic structure, but the catalytic activity for CO conversion is insufficient
Solution Approach 1:
The invention creates a composite catalyst system by combining YPO4 support with specific promoter materials. This composite structure enhances CO conversion catalytic activity while maintaining relatively simple overall composition and manufacturing 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 catalyst demonstrates superior exhaust gas purification performance, particularly in converting carbon monoxide to carbon dioxide, with increased catalytic activity and heat resistance compared to traditional YPO4-based catalysts, achieving lower temperature purification ratios for NOx, HC, and CO.
Implementation Method 1
a catalyst which uses, as a catalyst support, a composite phosphate consisting of Y3PO7 or Y8P2O17 can have a further increased catalytic activity, particularly a further increased catalytic activity of converting carbon monoxide to carbon dioxide
Implementation Method 2
hydrocarbons (HC) and carbon monoxide (CO) are purified by oxidizing the gases using catalysts
Data Source
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AI summary
A catalyst for exhaust gas purification having superior exhaust gas purification performance is provided. Disclosed is a catalyst containing, as a catalyst support, a composite phosphate containing yttrium and phosphorus and having a composition ratio of yttrium to phosphorus (Y/P) of greater than 1 as a molar ratio.