MnO2 Metallic Catalyst Surface for Ozone Conversion
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Solution Overview
Problem
Existing catalyst surfaces for component parts, particularly in applications like extractor hoods, face inefficiencies in catalytic activity due to incomplete coverage and material limitations, leading to suboptimal ozone conversion and potential reliance on high-resistance activated carbon filters.
Innovation Solution
A catalyst surface formed by combining metallic components with MnO2, where MnO2 is present in its γ polymorph and applied in a partial layer using cold gas spraying or other methods, enhancing catalytic activity and maintaining structural integrity, even at elevated temperatures, to achieve efficient ozone conversion without the need for activated carbon filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the catalyst surface is covered completely with MnO2, then the catalytic surface area is maximized, but the catalytic activity is reduced due to loss of metallic components
Solution Approach 1:
The patent applies local quality by creating a heterogeneous surface where metallic components and MnO2 coexist in specific spatial arrangements. The metallic components are distributed as discrete regions rather than uniform coverage, allowing different areas of the surface to perform different catalytic functions - the metal regions provide high catalytic activity while the MnO2 regions provide structural stability and additional catalytic sites.
Solution Approach 2:
The patent employs composite materials by combining metallic components with MnO2 to form a synergistic catalyst surface. This composite structure leverages the advantages of both materials: the metallic components provide high catalytic activity and electrical conductivity, while MnO2 provides structural stability and chemical versatility. The combination creates a catalyst that achieves higher overall activity than either material alone.
2Reliability
If the catalyst surface is covered completely with metallic components, then the catalytic activity is maximized, but the structural integrity and temperature stability are reduced
Solution Approach 1:
The patent applies local quality by creating a heterogeneous surface where metallic components and MnO2 coexist in specific spatial arrangements. The metallic components are distributed as discrete regions rather than uniform coverage, allowing different areas of the surface to perform different catalytic functions - the metal regions provide high catalytic activity while the MnO2 regions provide structural stability and additional catalytic sites.
Solution Approach 2:
The patent employs composite materials by combining metallic components with MnO2 to form a synergistic catalyst surface. This composite structure leverages the advantages of both materials: the metallic components provide high catalytic activity and electrical conductivity, while MnO2 provides structural stability and chemical versatility. The combination creates a catalyst that achieves higher overall activity than either material alone.
3Reliability
If activated carbon filters are used for air purification, then ozone conversion is achieved, but air resistance increases
Solution Approach 1:
The patent applies parameter changes by optimizing the physical and chemical parameters of the catalyst surface, including the particle size distribution of MnO2, the surface area to volume ratio, the metallic component distribution, and the porosity structure. These parameter optimizations enable the catalyst to achieve high ozone conversion efficiency while maintaining low air resistance, directly addressing the limitation of activated carbon filters.
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 combination of metallic components with MnO2 in a partial layer configuration significantly increases catalytic activity, allowing for effective ozone conversion and reducing air resistance, while maintaining the catalytic properties of MnO2, thus providing a more efficient and durable solution for air purification systems.
Implementation Method 1
cold gas spraying is used, in which the particles of the catalytic laminate material are fed into what is called a cold gas jet, a process gas flowing at supersonic velocity. 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
the catalytic activity of MnO2, which is known per se, can be increased by metallic components at the surface, even though the catalytic surface area of the MnO2 available is reduced overall
Data Source
AI summary
A component part has a catalyst surface. This surface has metallic components and components of MnO2 (13) in contact with the former. The metallic components are preferably formed of Ag and/or Ni. These material pairs achieve a great improvement in catalyst action compared to the pure metals. Especially in the case of use of Ni, which is toxicologically safe, these surfaces, for example, may also find use in ambient air purification for reduction of the ozone content. The surface can be applied, for example, by a coating of the component part, in which case the metallic component and the component of MnO2 are applied in two layers.