Titania-Platinum Catalyst for CO Removal
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Solution Overview
Problem
Existing catalysts for life support systems are inadequate in achieving high catalytic activity for removing carbon monoxide and formaldehyde from air, particularly in closed-loop systems where rapid air revitalization is critical, especially in scenarios like post-fire situations.
Innovation Solution
A catalyst comprising titania support particles with a specific surface area to platinum metal ratio between 5 and 50 m2/% Pt g, and optionally a pore volume to platinum ratio, where platinum is deposited using techniques like insipient wetness with chloroplatinic acid, enhancing adsorption and oxidation of target substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalysts are used in life support systems, then the system can operate with standard catalyst formulations, but the catalytic activity for removing carbon monoxide and formaldehyde is insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the catalyst by specifying precise ratios of titania support particle surface area to platinum metal (5-50 m2/% Pt g) and pore volume to platinum ratios. These parameter optimizations enable the catalyst to achieve both high reliability in removing CO and formaldehyde and high productivity in air revitalization rate, resolving the contradiction between catalytic activity and air processing speed.
Solution Approach 2:
The patent employs a composite catalyst structure combining titania support particles with platinum metal dispersed on the surface. This composite material leverages the high surface area of titania and the catalytic properties of platinum to simultaneously achieve high catalytic activity for toxic substance removal and high productivity for rapid air revitalization in closed-loop life support systems.
2Productivity
If the catalyst processes air at higher space velocities, then more air can be treated per unit time, but the removal efficiency of target substances decreases
Solution Approach 1:
The patent utilizes porous titania support particles with optimized pore volume to platinum ratios. The porous structure provides high surface area for catalyst dispersion and creates multiple reaction pathways, enabling the catalyst to maintain high removal efficiency even at elevated space velocities. This resolves the contradiction by allowing simultaneous high productivity and reliability through enhanced mass transfer and reaction kinetics within the porous structure.
3Reliability
If more platinum metal is added to increase catalytic activity, then the removal of carbon monoxide and formaldehyde improves, but the cost and complexity of catalyst manufacturing increase
Solution Approach 1:
The patent optimizes the platinum metal content by establishing specific ratio ranges (5-50 m2/% Pt g for surface area to platinum ratio). This parameter optimization achieves the desired catalytic activity for CO and formaldehyde removal while avoiding excessive platinum loading, thereby reducing manufacturing complexity and cost. The defined ratio parameters provide clear manufacturing specifications that balance performance with ease of production.
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 catalyst exhibits enhanced catalytic activity for single-pass removal of carbon monoxide and formaldehyde, treating higher levels at greater space velocities, making it suitable for closed-loop life support systems and emergency air revitalization.
Implementation Method 1
enhancing adsorption and oxidation of target substances
Implementation Method 2
A catalyst comprising titania support particles with a specific surface area to platinum metal ratio
Implementation Method 3
enhancing adsorption and oxidation of target substances
Data Source
AI summary
A catalyst for a life support system includes a plurality of titania support particles that define an average particle surface area. Platinum metal is disposed on the plurality of titania support particles such that a ratio of the average particle surface area to the percentage amount of the platinum metal is between 5 and 50 m2/% Pt g.