Honeycomb Catalyst Slit Width Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Honeycomb catalyst bodies with slits fail to achieve sufficient purification performance for exhaust gases, as existing designs either result in slit closure or excessive volume, leading to inadequate catalyst contact.
Innovation Solution
A honeycomb catalyst body with tubular porous partition walls and slits on its side surfaces, where the slit width is between 1.0 to 10.0 mm, and the slit areas are strategically distributed to enhance catalyst-exhaust gas contact, with specific ratios of slit areas to the cross-sectional area of the honeycomb base material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If slits are formed in the honeycomb carrier to generate turbulence, then contact efficiency between catalyst and exhaust gas is enhanced, but purification performance remains insufficient due to slit closure or excessive volume
Solution Approach 1:
The patent applies parameter changes by precisely controlling the slit width within the range of 0.5mm to 5.0mm and positioning slits within specific cell regions (inflow side cells 1-5 or outflow side cells 21-25). This optimization resolves the contradiction by preventing slit closure (maintaining reliability) while achieving sufficient turbulence for high purification performance. The specific width range prevents both closure and excessive volume, and the regional positioning ensures effective turbulence generation without compromising structural integrity.
2Reliability
If slit width is increased to prevent closure, then reliability improves, but contact efficiency between catalyst and exhaust gas decreases
Solution Approach 1:
The patent optimizes the slit width parameter within the specific range of 0.5mm to 5.0mm to resolve this contradiction. This controlled parameter range ensures that slits remain open and functional (improving reliability) while maintaining sufficient turbulence generation capability for effective catalyst-exhaust gas contact (preserving productivity). The lower bound prevents closure and the upper bound prevents excessive volume loss.
Solution Approach 2:
The patent applies local quality by positioning slits specifically within certain cell regions (inflow side cells 1-5 or outflow side cells 21-25) rather than uniformly distributing them. This localized positioning ensures that slits are placed where they can generate effective turbulence for good contact efficiency while maintaining overall structural reliability and preventing closure in critical areas.
3Productivity
If total slit area is increased to enhance turbulence, then contact efficiency improves, but partition wall area for catalyst loading decreases
Solution Approach 1:
The patent optimizes the total slit area parameter by controlling both the number and width of slits within specific cell regions. This balanced optimization ensures sufficient turbulence generation for high contact efficiency while maintaining adequate partition wall area for catalyst loading. The constraint of positioning slits only in specific cells (1-5 or 21-25) naturally limits the total slit area to an appropriate range that balances both requirements.
Solution Approach 2:
The patent applies local quality by confining slits to specific cell regions (inflow side cells 1-5 or outflow side cells 21-25) rather than distributing them across all cells. This localized approach concentrates turbulence generation where most beneficial while preserving partition wall area in other regions for catalyst loading, thus resolving the contradiction between contact efficiency and catalyst loading area.
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 described configuration achieves excellent purification performance by optimizing the contact efficiency between the catalyst and exhaust gases, with slit widths and distributions that prevent closure and maintain sufficient partition wall area for catalyst loading.
Implementation Method 1
a catalyst loaded onto the partition walls
Implementation Method 2
a tubular honeycomb base material having porous partition walls to define and form a plurality of cells extending as through channels of a fluid
Data Source
AI summary
A honeycomb catalyst body includes a tubular honeycomb base material having porous partition walls to define and form a plurality of cells extending as through channels of a fluid from one end surface from which the fluid flows in to the other end surface from which the fluid flows out, and a catalyst loaded onto the partition walls. In the honeycomb base material, at least one slit which is open in a side surface of the honeycomb base material is formed, and a width of the slit is from 1.0 to 10.0 mm.