Ta-POM Catalyst for Three-Way Exhaust Treatment
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Solution Overview
Problem
Current three-way catalysts (TWCs) for gasoline engine exhaust treatment face challenges in improving cold start performance, light-off performance, and oxygen storage capacity (OSC) across a wide range of platinum, palladium, and rhodium applications, particularly in reducing NOx, CO, and hydrocarbon emissions.
Innovation Solution
A catalyst article comprising a substrate with a catalyst composition that includes one or more platinum group metals (PGMs) and Ta-polyoxometalate (POM), where the Ta-POM is applied to the support material, forming Ta2O5 upon calcination, which enhances the catalytic properties by improving light-off temperatures and emission control performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional TWC formulations are used, then the catalyst can perform basic oxidation and reduction functions, but cold start performance and light-off performance remain insufficient
Solution Approach 1:
The invention modifies the chemical composition parameters of the catalyst by incorporating Ta-POM (tantalum polyoxometalate) alongside traditional PGMs and alumina. This compositional parameter change enables the catalyst to achieve lower light-off temperatures and improved cold start performance through enhanced oxygen storage and release capabilities
Solution Approach 2:
The invention creates a composite catalyst material combining multiple components: platinum group metals (Pt, Pd, Rh), Ta-POM (tantalum polyoxometalate), and alumina support. This composite structure synergistically improves cold start performance and light-off characteristics by integrating the oxygen storage capacity of Ta-POM with the catalytic activity of PGMs
2Quantity of substance
If PGM loading is reduced to lower costs, then resource efficiency improves, but emission control performance may deteriorate
Solution Approach 1:
The invention introduces Ta-POM as an intermediary material that enhances the catalytic efficiency of reduced PGM loadings. The Ta-POM acts as an oxygen storage and transfer mediator, facilitating the oxidation reactions that would otherwise require higher PGM quantities, thereby maintaining emission control performance with lower precious metal content
Solution Approach 2:
The invention changes the catalytic system parameters by adding Ta-POM, which alters the reaction mechanism and efficiency. This parameter change allows the system to achieve the same or better emission control performance with reduced PGM loading by utilizing the oxygen storage and release properties of Ta-POM
3Temperature
If the catalyst is designed for hot transient stage performance, then high temperature oxidation improves, but cold start and light-off performance may be compromised
Solution Approach 1:
The invention designs a multi-functional catalyst composition that simultaneously addresses cold start, light-off, and hot transient stage performance. The combination of PGMs, Ta-POM, and alumina creates a universal catalyst formulation that performs oxidation and reduction functions across a wide temperature range, eliminating the need to prioritize one temperature regime at the expense of another
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 composition significantly reduces NOx and THC emissions, lowers light-off temperatures, and provides improved hydrothermal stability, outperforming conventional TWCs with reduced PGM loading requirements, thus enhancing emission control and resource efficiency.
Implementation Method 1
the catalyst composition is obtained or obtainable by a method comprising: providing a support material comprising one or more PGMs supported thereon; providing a solution comprising a Ta-POM; contacting the support material with the solution to provide a support material comprising the Ta-POM supported thereon; and calcining the support material comprising the Ta-POM supported thereon
Implementation Method 2
TWCs perform three main functions: (1) oxidation of CO; (2) oxidation of unburnt HCs; and (3) reduction of NOx
Implementation Method 3
TWCs perform three main functions: (1) oxidation of CO; (2) oxidation of unburnt HCs; and (3) reduction of NOx
Implementation Method 4
TWCs perform three main functions: (1) oxidation of CO; (2) oxidation of unburnt HCs; and (3) reduction of NOx
Data Source
AI summary
Provided is a catalyst article comprising a substrate and a catalyst composition disposed on the substrate, the catalyst composition comprising a support material having supported thereon: one or more platinum group metals (PGMs); and a Ta-polyoxometalate (POM).