Cordierite Catalyst Carrier Thermal Management
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Solution Overview
Problem
Conventional catalyst carriers with high opening ratios exhibit excessive temperature rise at high load conditions, leading to catalyst deterioration due to inadequate thermal management.
Innovation Solution
A catalyst carrier with a honeycomb structure made of cordierite, featuring a high apparent specific heat capacity and a coating or alloy layer to regulate temperature, ensuring efficient heat absorption and distribution, thereby minimizing maximum temperature and suppressing catalyst deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a catalyst carrier with high opening ratio is used to improve light-off characteristic, then temperature rises easily at low temperature, but temperature becomes excessively high at high load conditions causing catalyst deterioration
Solution Approach 1:
The invention changes the thermal parameter of the catalyst carrier by selecting materials with specific heat capacity characteristics. The cordierite honeycomb structure combined with the coating layer creates a system where the effective specific heat varies with temperature, allowing easy temperature rise at low temperatures for light-off while limiting maximum temperature at high loads to prevent catalyst deterioration.
Solution Approach 2:
The invention uses a composite structure consisting of cordierite honeycomb carrier and a coating layer containing alumina and other oxides. This composite material combination provides both the high opening ratio needed for good light-off characteristics and the thermal management properties to prevent excessive temperature rise that would damage the catalyst.
2Use of energy by moving object
If a catalyst carrier with high opening ratio is used to improve light-off characteristic, then heat absorption is enhanced, but maximum temperature cannot be controlled leading to catalyst deterioration
Solution Approach 1:
The invention modifies the thermal parameters of the catalyst carrier through material selection and composition control. The coating layer's specific heat capacity and thermal conductivity are optimized to enhance heat absorption during cold start while simultaneously limiting the maximum temperature reached during high-load operation, thereby protecting the catalyst from thermal damage.
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 carrier effectively raises temperature at low loads for quick light-off characteristics while maintaining low temperatures at high loads, reducing catalyst deterioration and maintaining purification efficiency.
Implementation Method 1
the apparent specific heat means a charge heat amount required for substantially increasing the temperature of a unit mass (Kg) by 1 K, inclusive of the influence of endotherm or exotherm caused by change in crystalline form, partial melting, coagulation, phase transformation, vitrification, amorphous-formation, crystallization and the like
Implementation Method 2
the apparent specific heat measured at 800° C. and defined as follows is 1.8 times or more greater than that measured at room temperature
Implementation Method 3
a catalyst carrier which is used for carrying a catalyst thereon, characterized in that the apparent specific heat measured at 800° C. and defined as follows is 1.8 times or more greater than that measured at room temperature
Implementation Method 4
a catalyst layer 15 is carried on the surfaces of partition walls 4 forming cells 3 in a honeycomb structure
Data Source
AI summary
Disclosed is a catalyst carrier which is used for carrying a catalyst thereon. The catalyst carrier is characterized in that the apparent specific heat measured at 800° C. is 1.8 times or more greater than that measured at room temperature, wherein the apparent specific heat means a charge heat amount required for substantially increasing the temperature of a unit mass (kg) by 1 K, inclusive of the influence of endotherm or exotherm caused by change in crystalline form, partial melting, coagulation, phase transformation, vitrification, amorphous-formation, crystallization and the like.