W-Zn-Al Catalyst for PFC Decomposition
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Solution Overview
Problem
Conventional catalysts for decomposing perfluorocompounds (PFCs) in semiconductor processes suffer from reduced durability and conversion efficiency due to high-temperature decomposition reactions, leading to decreased active sites and system instability.
Innovation Solution
A catalyst combining aluminum oxide with zinc as an active component and tungsten as an auxiliary component, formulated with specific weight ratios and prepared using methods like impregnation or co-precipitation, to enhance reaction activity and durability, and molded into shapes like particles or spheres for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature decomposition reaction is used to decompose PFCs, then decomposition efficiency is improved, but catalyst durability deteriorates due to carrier property conversion and reduced specific surface area
Solution Approach 1:
The patent uses a composite catalyst structure combining alumina carrier with zinc and tungsten active components. The composite formulation (Al-Zn-W) creates synergistic effects where zinc provides high-temperature stability and tungsten enhances catalytic activity, allowing the catalyst to maintain both high decomposition efficiency and durability under high-temperature conditions.
Solution Approach 2:
The patent modifies the catalyst composition parameters by introducing specific weight ratios of zinc (1-10 wt%) and tungsten (1-5 wt%) on the alumina carrier. This parameter optimization enables the catalyst to maintain its structural properties and active surface area at high temperatures, resolving the contradiction between decomposition efficiency and durability.
2Temperature
If alumina catalyst is used for PFC decomposition, then decomposition reaction proceeds at high temperature, but active sites are reduced leading to decreased conversion rate
Solution Approach 1:
The patent introduces zinc and tungsten as intermediary active components that mediate the decomposition reaction on the alumina carrier. These components provide alternative reaction pathways with lower activation energy, enabling efficient decomposition at high temperatures while maintaining high conversion rates through the synergistic catalytic action of Zn and W.
3Ease of manufacture
If conventional catalyst formulation is used, then manufacturing is simple, but performance and durability are insufficient for industrial application
Solution Approach 1:
The patent applies local quality enhancement by selectively incorporating zinc and tungsten components at specific concentrations (Zn: 1-10 wt%, W: 1-5 wt%) on the alumina carrier. This localized compositional optimization ensures that the active components are distributed to provide both high performance and durability while maintaining manufacturability through standard impregnation and sintering processes.
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 W—Zn—Al catalyst exhibits improved durability and reaction activity, allowing for PFC decomposition at lower temperatures, reducing operating costs and system size, while maintaining performance even in aged states, compared to conventional catalysts.
Implementation Method 1
A catalyst combining aluminum oxide with zinc as an active component and tungsten as an auxiliary component, formulated with specific weight ratios and prepared using methods like impregnation or co-precipitation, to enhance reaction activity and durability
Implementation Method 2
The hydrolysis method is known as a process in which the PFC decomposition reaction proceeds at a high temperature in a range of 700° C. to 900° C. using an alumina catalyst and water vapor
Data Source
AI summary
Proposed are a catalyst for decomposing perfluorocompounds (PFCs) and a method of preparing the same. The provided catalyst for decomposing PFCs and the method of preparing the same are as follows. Zinc as an active component for performance improvement and tungsten (W) as an auxiliary component are added to alumina selected from at least one of gamma alumina, aluminum trihydroxide, boehmite, and pseudo-boehmite, and a weight ratio of Al, Zn, and W is at 100:30 to 100:1 to 11. The catalyst for decomposing PFCs not only has an effect of having durability against fluorine generated by decomposition of PFCs but also has a synergistic effect of improving reaction activity. Furthermore, the catalyst decomposes PFCs at a lower temperature than conventional catalysts for decomposing PFCs. Thus, it is possible to reduce operating costs and secure the durability of the system during continuous operation.