Cobalt Oxide Promoter Platinum Catalyst Odor Reduction
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Solution Overview
Problem
Current combined hydrocarbon and ozone converters do not adequately reduce odors in aircraft cabin air without increasing the cost of precious metal catalysts, as they require higher amounts of hydrocarbon catalyst to achieve further odor reduction.
Innovation Solution
A catalytic converter with a washcoat containing cobalt oxide, aluminum oxide, and platinum, where the weight ratio of the hydrocarbon converting catalyst to the ozone reacting component is between 1:5 and 1:100, enhancing hydrocarbon conversion and ozone decomposition without increasing the precious metal load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the amount of hydrocarbon catalyst is increased to further reduce odor, then odor reduction is improved, but manufacturing cost increases due to precious metal expense
Solution Approach 1:
The invention changes the chemical composition parameters of the washcoat by incorporating aluminum oxide (alumina) at specific weight ratios (1:0.6 to 1:2 with cobalt oxide) and optimizing the platinum to cobalt oxide ratio (1:5 to 1:100). This parameter optimization enhances the catalytic efficiency of the existing precious metals, allowing effective odor reduction without increasing the amount of hydrocarbon catalyst or manufacturing cost
Solution Approach 2:
The invention uses a composite washcoat material consisting of cobalt oxide, aluminum oxide (alumina), and a silicone-containing binder. This composite structure creates synergistic effects where alumina provides high surface area and structural stability, cobalt oxide acts as an ozone reacting component and promoter, and the binder holds the catalyst particles. The composite material maximizes the utilization of precious metal catalysts, improving odor reduction performance without increasing precious metal load or manufacturing cost
2Device complexity
If a combined converter is used to reduce weight and pressure drop, then device complexity is reduced, but hydrocarbon conversion efficiency is insufficient without increasing catalyst amount
Solution Approach 1:
The invention optimizes the weight ratio parameters of the catalyst components (platinum to cobalt oxide at 1:5 to 1:100, and cobalt oxide to aluminum oxide at 1:0.6 to 1:2) to enhance catalytic efficiency. This parameter optimization allows the combined converter structure to achieve high hydrocarbon conversion efficiency without requiring increased catalyst amounts, thus maintaining both structural simplicity and high productivity
Solution Approach 2:
The invention introduces cobalt oxide as an intermediary substance that serves dual functions: it reacts with ozone and promotes platinum's hydrocarbon conversion activity. This intermediary role of cobalt oxide allows the combined converter to achieve both ozone destruction and efficient hydrocarbon conversion without requiring separate converters or increased precious metal catalyst, maintaining structural simplicity while enhancing productivity
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 increases hydrocarbon conversion and ozone decomposition efficiency, reducing odor intensity and improving air quality without increasing manufacturing costs, with the cobalt oxide acting as a promoter for platinum, sustaining catalytic activity even when active sites are blocked by contaminants.
Implementation Method 1
an ozone-destroying catalytic converter... cobalt oxide ozone reacting component
Implementation Method 2
a hydrocarbon converting catalyst incorporated into the washcoat... converting at least one of the hydrocarbon molecules to carbon dioxide and water
Implementation Method 3
converting the hydrocarbons into carbon dioxide and water
Implementation Method 4
the washcoat is prepared by mixing, applying and calcining a slurry of boehmite metal oxide precursor, cobalt carbonate and a silicone-containing binder to the substrate
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A combined hydrocarbon/ozone converter (30) includes a substrate (32), a metal oxide washcoat (34) and a hydrocarbon converting catalyst (36), such as platinum. The metal oxide washcoat comprises an ozone reacting component, such as cobalt oxide, and a non-catalytic component, such as aluminum oxide. The weight ratio of the hydrocarbon converting catalyst to the ozone reacting component may be between about 1:5 and about 1:100.