Diesel Particulate Filter Using Ceria Catalysis and Joule Heating
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Solution Overview
Problem
Current Diesel Particulate Filtration (DPF) systems face high production and maintenance costs, and issues with filter material plugging due to low operating temperatures, particularly in hybrid vehicles.
Innovation Solution
A DPF assembly using pneumatically porous ceramic filter panels with a mechanical support system and electrically conductive electrodes, formed from a composite mix of mineral fibers and ceramic powder, capable of establishing a voltage differential to burn off soot capture, and treated with Ceria for enhanced catalytic combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional wall flow honeycombs with low thermal expansion materials are used, then filtration is achieved, but production and maintenance costs are high
Solution Approach 1:
The patent uses a composite material consisting of ceramic foam substrate coated with a catalytic composition containing precious metals (platinum, palladium, rhodium) dispersed on a ceramic carrier material. This composite structure provides both mechanical strength and catalytic activity at lower temperatures, reducing reliance on expensive conventional materials while maintaining filtration reliability.
Solution Approach 2:
The patent changes the operational temperature parameter by introducing catalytic materials that enable soot combustion at lower temperatures (below 600°C). This parameter change allows the filter to operate effectively in hybrid vehicles with lower exhaust temperatures, preventing plugging while reducing maintenance costs.
2Reliability
If conventional filter materials are used, then filtration is achieved, but plugging occurs due to low operating temperatures
Solution Approach 1:
The patent introduces catalytic materials that lower the combustion temperature threshold from conventional high temperatures to below 600°C. This parameter change enables effective soot oxidation in hybrid vehicles operating at lower temperatures, preventing filter plugging while maintaining filtration effectiveness.
Solution Approach 2:
The patent uses catalytic materials (platinum, palladium, rhodium) that act as strong oxidants to accelerate soot combustion at lower temperatures. This accelerated oxidation process maintains filtration reliability even when exhaust temperatures are reduced, as in hybrid vehicle operation.
3Productivity
If high voltage is applied to burn off soot, then particulate removal is achieved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical/electrical system (high voltage electrodes) with a chemical/catalytic system. Instead of applying high voltage to burn off soot, the catalytic materials on the filter walls facilitate low-temperature combustion through chemical reactions, significantly reducing device complexity while maintaining soot removal efficiency.
Solution Approach 2:
The catalytic filter enables self-regeneration through the exhaust heat itself. The heat from exhaust gases, combined with the catalytic action, automatically burns off accumulated soot without requiring external high voltage input or complex control systems, making the system self-maintaining.
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 solution provides efficient particulate filtration and combustion at lower temperatures, reducing fuel consumption, minimizing platinum catalyst loading, and offering adaptability to diesel fuel with high sulfur content, while maintaining stability and porosity for effective exhaust gas flow.
Implementation Method 1
one or more of said filter panels has a mechanical support component capable of establishing a voltage differential across said filter panel, said voltage differential being large enough to burn off a portion of the soot capture within said panel
Implementation Method 2
pneumatically porous ceramic filter panels... when exposed to exhaust gases trap harmful elements
Implementation Method 3
Treated with Ceria for enhanced catalytic combustion
Data Source
AI summary
A Diesel Particulate Filter (DPF) assembly configured to be incorporated in the exhaust gas stream, the DPF assembly comprising: Quartz/Composite ceramic mixture disposed as filter elements, mechanical support components and optional electrical soot removal solutions including electrical, di-electrical and microwave solutions.