Catalyst Reactivity Diagnosis via Test Medium
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Solution Overview
Problem
Existing methods for diagnosing gas-permeable catalysts and filters removed from exhaust gas tracts, such as those in motor vehicles, are insufficient for determining their functionality and ability to meet exhaust gas standards after reinstallation, as they rely on physical measurements like counter pressure and weight, which do not accurately assess catalytic reactivity.
Innovation Solution
A method involving the application of a test medium like propane gas or carbon monoxide to the catalyst, with measurements taken of the concentration of reduced or oxidized constituents downstream or the temperature of the catalyst, allowing for accurate assessment of catalytic reactivity, which indicates the catalyst's ability to convert pollutants and meet exhaust gas standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical measurements like counter pressure and weight are used to diagnose catalysts, then the diagnostic process is simple and quick, but the measurement precision and reliability of catalytic function assessment are insufficient
Solution Approach 1:
The patent replaces mechanical measurement methods (counter pressure, weight) with chemical and thermal measurement methods. Specifically, it uses concentration measurement of reduced/oxidized constituents and temperature measurement to assess catalytic reactivity, substituting mechanical diagnostics with chemical reaction-based diagnostics that directly evaluate catalyst performance.
Solution Approach 2:
The patent changes the measurement parameters from physical properties (pressure, weight) to chemical properties (concentration of constituents) and thermal properties (temperature). This parameter transformation enables direct measurement of catalytic reactivity by monitoring chemical reactions and heat emission during catalyst operation.
2Reliability
If chemical reaction measurements are implemented to assess catalytic reactivity, then the functional assessment accuracy improves, but the measurement and diagnostic complexity increases
Solution Approach 1:
The patent introduces test media (propane gas, carbon monoxide) as intermediaries to assess catalyst function. These test substances react with the catalyst surface, and their transformation (reduction/oxidation) serves as a measurable indicator of catalytic reactivity. The intermediaries enable indirect measurement of catalyst performance through easily detectable chemical changes.
Solution Approach 2:
The patent utilizes temperature changes (thermal radiation) as a visual/measureable indicator of catalytic activity. The heat emission during chemical reactions on the catalyst surface is detected through temperature measurement, providing a direct and reliable indicator of catalytic reactivity without complex instrumentation.
3Ease of operation
If temperature measurement is used to determine catalytic reactivity, then the measurement simplicity increases, but the precision of chemical reaction detection may be reduced
Solution Approach 1:
The patent combines multiple measurement approaches (concentration measurement of reduced/oxidized constituents and temperature measurement) into a unified diagnostic system. This merging allows the system to leverage both the precision of chemical analysis and the simplicity of thermal detection, providing comprehensive and accurate catalytic reactivity assessment through complementary measurement methods.
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
This method provides precise information on the catalytic reactivity of gas-permeable catalysts or filters, enabling the determination of their effectiveness in converting pollutants and ensuring compliance with exhaust gas standards, while also allowing for the diagnosis and potential reconditioning of catalysts to prevent insufficient reinstallation.
Implementation Method 1
a test medium with a defined composition, such as propane gas or carbon monoxide, is applied to a front face of the object... wherein at a position located downstream a concentration of at least one reduced or oxidized constituent of the test medium is measured after passage through the object
Implementation Method 2
a concentration of at least one reduced or oxidized constituent of the test medium is measured
Implementation Method 3
a concentration of at least one reduced or oxidized constituent of the test medium is measured after passage through the object
Implementation Method 4
a concentration of at least one reduced or oxidized constituent of the test medium is measured
Implementation Method 5
a temperature of the object is measured after the test medium is applied thereto
Implementation Method 6
measuring whether a chemical reaction such as a reduction or an oxidation of constituents of the test medium takes place in the object
Data Source
AI summary
Method and apparatus for measuring catalytic reactivity in diagnosing a gas-permeable object, such as a catalyst or a filter, that has been removed from an exhaust gas tract connected downstream of an internal combustion engine of, motor vehicle. The method includes applying, through an opening in a device, a test medium with a defined composition, to a front face of the removed object; and measuring, at a position located, with respect to a flow direction of the test medium, downstream of the front face, at least of: a concentration of at least one reduced or oxidized constituent of the test medium after passage of the test medium through the gas-permeable object; and a temperature of the object after the test medium is applied to the gas-permeable object.