Catalyst Surface with Partial MnO2 Coating for Ozone Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing catalyst surfaces for component parts, particularly in extractor hoods, face inefficiencies in catalytic activity due to incomplete coverage with metallic regions and MnO2, leading to reduced catalytic surface area and ozone conversion effectiveness.
Innovation Solution
A catalyst surface comprising metallic regions of Co, Sn, or Zn alloys in contact with γ polymorph MnO2 nanoparticles, where the MnO2 constitutes a ceramic proportion with a surface area between 30-60% of the total, applied via cold gas spraying to enhance catalytic activity and ozone conversion without complete surface coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete surface coverage with metallic regions and MnO2 is used, then catalytic activity is improved, but material usage and flow resistance increase
Solution Approach 1:
The patent applies different materials (metallic regions and MnO2) to different local areas of the component surface rather than uniform coverage. The MnO2 is applied as a partial covering layer specifically in regions where it provides catalytic benefit, while metallic regions are exposed in other areas, creating local functional zones that optimize catalytic activity without requiring complete surface coverage.
Solution Approach 2:
The patent uses partial coverage of MnO2 on the component surface rather than complete coverage. This partial action approach achieves sufficient catalytic activity for ozone conversion while reducing the quantity of MnO2 material required and minimizing flow resistance compared to excessive full coverage.
2Reliability
If complete surface coverage with metallic regions and MnO2 is used, then catalytic activity is improved, but flow resistance increases
Solution Approach 1:
By creating local functional zones with MnO2 partial coverage rather than uniform complete coverage, the patent maintains catalytic activity in specific areas while leaving other areas open for gas flow, thereby reducing overall flow resistance while preserving necessary catalytic function.
Solution Approach 2:
The partial coverage approach applies MnO2 only where needed for catalysis rather than excessive full surface coverage, achieving the necessary catalytic effect while minimizing obstruction to gas flow and reducing flow resistance.
3Quantity of substance
If MnO2 nanoparticles with diameter greater than 100 nm are used, then catalytic surface area is reduced, but material usage is minimized
Solution Approach 1:
The patent specifies MnO2 nanoparticles with diameter greater than 100 nm, changing the particle size parameter from smaller nanoparticles to larger particles. This parameter change reduces the total surface area and material quantity required while maintaining effective catalytic activity through the partial coverage strategy and optimal particle size for the cold gas spraying process.
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 solution achieves a high catalytic activity and efficient ozone conversion with a partial coating of MnO2, maintaining catalytic properties while minimizing material usage and flow resistance, thus eliminating the need for activated carbon filters in extractor hoods.
Implementation Method 1
In the cold gas jet, these particles are accelerated toward the surface of the component part to be coated and remain adhering on this surface with conversion of the kinetic energy thereof
Implementation Method 2
a catalyst surface comprising metallic regions of Co or Sn or Zn or alloys of at least one of these metals, and regions of MnO2 in contact with the metallic regions
Data Source
AI summary
A component has a catalyst surface including metal regions and regions of MnO2 contacting the former, wherein the metal regions are made of Co and/or Sn and/or Zn (or alloys of said metals). Said material pairings achieve a significantly improved catalytic effect in comparison to the pure metals. Said surfaces can be used, for example, in room air purification for reducing ozone content. The surface can be applied, for example, by coating the component, wherein the metal region and the region of MnO2 are applied in two layers.