Zeolite Catalyst Platinum Removal via Thermal Regeneration
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Solution Overview
Problem
Platinum contamination in catalytic components of engine aftertreatment systems interferes with the proper operation of downstream components, reducing NOx conversion efficiency and increasing NH3 oxidation efficiency, leading to increased operating costs and reduced service life.
Innovation Solution
Elevating the temperature of contaminated NOx reduction catalysts to at least 600°C for a predetermined time period, typically between 30 to 50 hours, to remove platinum contamination, thereby restoring NOx conversion efficiency and reducing NH3 oxidation efficiency, using a procedure that can be controlled by a computer program product to determine the optimal temperature and time based on specific catalyst conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum is used in upstream catalytic components, then catalytic activity is improved, but platinum contamination occurs in downstream components
Solution Approach 1:
The patent converts the harmful effect of platinum contamination into a beneficial diagnostic tool by monitoring NH3 oxidation efficiency changes that indicate platinum presence, allowing for targeted regeneration actions that restore downstream catalyst performance
2Reliability
If platinum accumulates in downstream catalytic components, then NOx conversion efficiency decreases, but NH3 oxidation efficiency increases
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring NH3 oxidation efficiency as an indicator of platinum contamination levels, using this information to trigger regeneration processes when contamination thresholds are exceeded, thereby restoring NOx conversion efficiency
Solution Approach 2:
The patent performs preliminary diagnostic actions by monitoring catalyst performance parameters before significant contamination occurs, allowing for proactive regeneration scheduling that prevents severe performance degradation
3Duration of action of stationary object
If platinum contamination is present, then catalyst service life is reduced, but contamination detection and regeneration require additional process steps
Solution Approach 1:
The patent enables self-service by using the catalyst's own performance characteristics (NH3 oxidation efficiency) as diagnostic indicators of contamination, allowing the system to self-diagnose and self-regenerate without external inspection equipment
Solution Approach 2:
The patent makes the downstream catalyst serve multiple functions: its primary NOx reduction function plus a secondary diagnostic function where changes in its NH3 oxidation behavior indicate platinum contamination levels, eliminating the need for separate detection systems
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
Significantly recovers NOx conversion efficiency and reduces NH3 oxidation, extending the service life of NOx reduction catalysts by removing platinum contamination, with recovery rates varying non-linearly with temperature and time, achieving up to 95% recovery within specific time frames.
Implementation Method 1
elevating the temperature of the catalytic component to a rejuvenation temperature for a predetermined time period
Data Source
AI summary
An example method includes determining that a selective catalytic reduction (SCR) component having a zeolite-based catalyst is contaminated with platinum (Pt). The method further includes elevating the temperature of the SCR component to at least 600° C. in response to the determining the catalytic component is contaminated with Pt, and maintaining the elevated temperature of the catalytic component for a predetermined time period thereby restoring reduction activity of the catalyst.