Iridium-Ruthenium Doped Catalyst for NOx, Ammonia, and N2O Control
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Solution Overview
Problem
Existing three-way catalysts face challenges in maintaining high nitrogen oxide conversion rates in lean regions, generate ammonia in rich regions, and emit nitrous oxide, which has a high global warming potential.
Innovation Solution
Doping an iridium-ruthenium catalyst component into three-way catalysts, diesel oxidation catalysts, or lean NOx traps supported on a honeycomb structure, enhancing nitrogen oxide reduction performance and inhibiting ammonia and nitrous oxide emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-way catalyst is used to reduce nitrogen oxides, then nitrogen oxide conversion is improved, but ammonia is generated in rich regions and nitrous oxide is emitted
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by doping iridium (0.01-10 wt%) and ruthenium (0.01-10 wt%) into the three-way catalyst system. This parameter modification enables the catalyst to simultaneously achieve high nitrogen oxide conversion while suppressing ammonia and nitrous oxide generation through altered surface reaction pathways
Solution Approach 2:
The patent creates a composite catalyst system by combining traditional three-way catalyst materials with iridium and ruthenium dopants. This composite structure leverages the synergistic effects of multiple metals to achieve enhanced nitrogen oxide reduction performance while simultaneously inhibiting the formation of harmful ammonia and nitrous oxide byproducts
2Device complexity
If existing three-way catalyst technology is used, then the catalyst structure is simple, but nitrogen oxide reduction performance drops in lean regions
Solution Approach 1:
The patent modifies the compositional parameters of the catalyst by introducing iridium and ruthenium dopants at controlled concentrations (0.01-10 wt% each). This parameter change enhances the catalyst's nitrogen oxide reduction capability in lean regions while maintaining structural simplicity and avoiding complex multi-component systems
3Reliability
If iridium-ruthenium catalyst powder is used directly, then catalytic activity is improved, but manufacturing process becomes complex
Solution Approach 1:
The patent optimizes the doping parameters by limiting iridium and ruthenium content to 0.01-10 wt% each, which maintains high catalytic activity while ensuring ease of manufacture. This parameter control prevents excessive complexity in the doping process and material handling
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
Improves nitrogen oxide conversion rates by 30% in lean regions and significantly reduces ammonia and nitrous oxide emissions, offering an eco-friendly solution to meet stringent exhaust gas regulations.
Implementation Method 1
doping an iridium-ruthenium catalyst component into a three-way catalyst (TWC), a diesel oxidation catalyst, or a lean NOx trap
Implementation Method 2
oxidation of carbon monoxide
Implementation Method 3
decomposition of hydrocarbons
Data Source
AI summary
An object of the present invention is to increase the reduction performance of nitrogen oxides compared to existing three-way catalysts; simultaneously inhibit the emission of ammonia and nitrous oxide; simplify a process by means of a method of further doping an iridium-ruthenium catalyst into a commercial three-way catalyst; and expand the scope of application. The present invention provides a catalyst for simultaneously inhibiting the emission of ammonia and nitrous oxide by doping an iridium-ruthenium catalyst component into a three-way catalyst (TWC), a diesel oxidation catalyst, or a lean NOx trap supported on a honeycomb support.