MnO2-CeO2 Catalyst Surface for Ozone Reduction
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Solution Overview
Problem
Existing catalyst surfaces for ozone reduction lack high catalytic activity, particularly when using manganese oxide and cerium oxide combinations, as they often require complete surface coverage and are inefficient in ozone decomposition.
Innovation Solution
A catalyst surface is created by combining areas of MnO2 and CeO2 oxide particles with metallic areas of Ag, Ni, Co, Cu, Sn, or Zn, where CeO2 enhances the catalytic activity of MnO2 by easily releasing and absorbing oxygen, and the metallic areas are integrated through cold gas spraying or other methods, allowing for partial coverage and increased catalytic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a catalyst surface is created using only MnO2 particles, then the catalytic activity for ozone decomposition is moderate, but the surface area required for effective catalysis is large
Solution Approach 1:
The patent creates a composite catalyst surface by combining MnO2 particles with CeO2 particles and metallic particles (Ag, Ni, Co, Cu, Sn, or Zn). This composite structure leverages the complementary properties of each material: MnO2 provides baseline catalytic activity, CeO2 enhances oxygen release and absorption capacity, and the metallic particles significantly boost catalytic efficiency for ozone decomposition, thereby achieving high catalytic activity in a reduced surface area.
Solution Approach 2:
The invention implements local quality by creating distinct functional zones on the catalyst surface: areas with MnO2 particles, areas with CeO2 particles, and areas with metallic particles. Each zone contributes different catalytic properties, with the metallic areas providing particularly high catalytic activity for ozone decomposition. This spatial differentiation of material properties optimizes the overall catalytic performance while reducing the total surface area needed.
2Reliability
If CeO2 particles are added to enhance MnO2 catalytic activity, then the catalytic efficiency increases, but the material complexity and production cost increase
Solution Approach 1:
The patent employs a three-component composite material system (MnO2, CeO2, and metallic particles) where each component serves a specific function. CeO2 is specifically selected for its ability to easily release and absorb oxygen, which complements MnO2's catalytic properties. The metallic particles further enhance the system's catalytic efficiency for ozone decomposition. This multi-material composite approach achieves superior catalytic efficiency while managing material complexity through functional specialization.
3Area of stationary object
If the catalyst surface is completely covered with oxide particles, then the surface area is maximized, but the catalytic activity per unit area decreases due to reduced MnO2 availability
Solution Approach 1:
The invention applies local quality by creating a non-uniform distribution of particle types on the catalyst surface. Instead of complete coverage with a single material, the surface contains distinct areas with MnO2 particles, CeO2 particles, and metallic particles. The metallic areas, in particular, provide high catalytic activity per unit area for ozone decomposition, compensating for the reduced MnO2 coverage while maintaining adequate total surface area.
Solution Approach 2:
The patent implements partial coverage strategy where the oxide particle layers (MnO2 and CeO2) do not completely cover the substrate surface. Instead, they form partial layers that expose underlying metallic areas or create interspersed zones of different materials. This partial coverage approach ensures that highly active catalytic sites remain accessible while still providing sufficient total surface area for effective ozone decomposition.
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 MnO2 and CeO2 with metallic areas significantly increases catalytic activity, enabling efficient ozone decomposition with reduced material usage and maintaining catalytic effectiveness even with partial surface coverage, thus improving ozone reduction efficiency.
Implementation Method 1
CeO2 is able to release and absorb oxygen easily. This can be expressed in a very simplified way with the following reaction equation. CeO2 <-> CeO 2-x + x/2 O 2
Implementation Method 2
a component with a catalyst surface... efficient ozone decomposition... The combination of MnO2 and CeO2 with metallic areas significantly increases catalytic activity, enabling efficient ozone decomposition
Implementation Method 3
Cold gas spraying is used for this purpose, in which the particles of the catalytic coating material are fed into a so-called cold gas jet, a process gas flowing at supersonic speed. In the jet of cold gas, these particles are accelerated towards the surface of the component to be coated and remain attached to this surface while converting their kinetic energy.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a component having a catalyst surface (12). According to the invention, said surface (12) has regions (13b) made of CeO2 and regions made of MnO2 (13a) which contact the former. It has surprisingly been found that said material pairings achieve a drastically improved catalytic effect compared to pure oxides. Said surfaces can, for example, also be used in indoor air purification to reduce the ozone content. The surface can, for example, be applied by coating (15) the component and processed by cold-gas spraying of, for example, particles (21) made of MnO2, to which CeO2 is applied.