Cobalt Oxide Platinum Catalyst for Aircraft Air Purification
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Solution Overview
Problem
Aircraft environmental control systems face challenges in efficiently removing hydrocarbons and ozone from pressurized air, which can be odorous and harmful, while existing solutions are costly and have limited maintenance life due to the use of precious metals and ozone catalyst decomposition.
Innovation Solution
A hydrocarbon and ozone catalyst system using cobalt oxide for ozone decomposition and platinum for hydrocarbon conversion, supported by titanium oxide, applied as catalytic layers on high-temperature components to achieve efficient conversion at lower costs and extended catalyst life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional precious metal catalysts are used for hydrocarbon and ozone removal, then conversion efficiency is improved, but cost increases and catalyst life is limited due to decomposition
Solution Approach 1:
The patent replaces expensive precious metal catalysts with a cheaper catalyst composition containing cobalt oxide, manganese oxide, and zinc oxide. Although these materials may have shorter individual lifetimes, the system extends overall catalyst life through a recoating mechanism where used catalyst layers are removed and fresh layers are applied to the same substrate, effectively creating a reusable cheap catalyst system that eliminates precious metal dependency while maintaining conversion efficiency
Solution Approach 2:
The patent changes the chemical composition parameters of the catalyst from traditional precious metals to a specific combination of cobalt oxide, manganese oxide, and zinc oxide in controlled ratios. This parameter change in material composition achieves comparable hydrocarbon and ozone conversion efficiency while dramatically reducing the quantity of expensive substances required, directly addressing the cost-efficiency contradiction
2Productivity
If ozone catalyst is used to remove ozone, then ozone conversion is improved, but catalyst life is reduced due to decomposition
Solution Approach 1:
The patent implements a catalyst recoating system where decomposed or used ozone catalyst layers are discarded and removed from the substrate, and fresh catalyst layers are recovered and applied to the same substrate. This process separates the substrate (which remains intact) from the consumable catalyst layer, allowing continuous recovery and reuse of the substrate while maintaining high ozone conversion efficiency through regular catalyst renewal, thereby extending the effective operational duration of the catalyst system
Solution Approach 2:
The patent extracts the catalyst function from a permanent integrated component and makes it a separable, replaceable layer. The catalyst is applied as a distinct coating that can be removed and reapplied independently from the substrate, allowing the substrate to be reused while the catalyst layer is refreshed. This extraction of the catalyst layer enables extended system life by separating the durable substrate from the consumable catalyst material
3Productivity
If entire catalyst components are replaced when performance degrades, then conversion efficiency is maintained, but weight and cost increase
Solution Approach 1:
The patent segments the catalyst system into two distinct parts: a permanent substrate that provides structural support and remains in place, and a consumable catalyst layer that is applied to and removed from the substrate. This segmentation allows only the catalyst layer to be replaced when performance degrades, while the substrate is retained and reused. Consequently, the overall system weight increases minimally since only thin catalyst layers are replaced rather than entire heavy components, while conversion efficiency is maintained through periodic catalyst renewal
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 system effectively reduces hydrocarbons and ozone in pressurized air, maintaining passenger comfort while reducing fuel consumption and weight, with the ability to recoat surfaces for extended performance without replacing entire components.
Implementation Method 1
The one or more catalytic layers include an ozone catalytic component configured to convert ozone to oxygen
Implementation Method 2
The one or more catalytic layers include a hydrocarbon catalytic component configured to convert hydrocarbons to carbon dioxide and water
Data Source
AI summary
In some examples, a composition includes a hydrocarbon and ozone catalyst. The hydrocarbon and ozone catalyst includes one or more catalytic layers overlying a substrate. The one or more catalytic layers include a non-catalytic component, an ozone catalytic component, and a hydrocarbon catalytic component. The non-catalytic component includes titanium oxide. The ozone catalytic component includes cobalt oxide. The hydrocarbon catalytic component includes platinum. An outermost layer of the one or more catalytic layers includes the hydrocarbon catalytic component distributed in the non-catalytic component.