PTFE Catalyst Filter Fibers Using Solid-State Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing PTFE fibers used in catalyst filters face issues with catalyst desorption during the dedusting process due to their hydrophobic nature, leading to inefficient NOx removal, and conventional SCR processes using vanadium oxides require organic solvents for coating, which complicates the manufacturing process.
Innovation Solution
A method involving the mixing of PTFE powder with a denitrification catalyst comprising V2O5 and a promoter supported on a zeolite substrate, followed by extrusion, rolling, and stretching to create PTFE fibers with uniformly distributed catalyst particles, enhancing catalyst retention and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SCR process uses vanadium oxides for catalyst coating, then NOx removal performance is achieved, but organic solvents are required which complicates the manufacturing process
Solution Approach 1:
The invention changes the physical state of the catalyst from liquid coating (requiring organic solvents) to solid particle mixing. The catalyst is prepared as solid particles containing V2O5 and promoters, then mixed with PTFE powder in a solid-state process, eliminating the need for organic solvent-based coating operations.
Solution Approach 2:
The invention replaces the chemical coating process (using organic solvents) with a mechanical mixing process. Solid catalyst particles are mixed with PTFE powder through mechanical means (mixing equipment), then the mixture is extruded and formed into fibers, substituting the chemical coating step with a mechanical mixing and forming step.
2Reliability
If PTFE fibers are used as catalyst filter media, then filter performance is achieved, but catalyst particles are desorbed during dedusting process
Solution Approach 1:
The invention merges the catalyst particles with the PTFE fiber formation process. Catalyst particles are mixed with PTFE powder before extrusion, so the catalyst becomes an integral part of the fiber structure rather than a separate coating. This merging prevents catalyst desorption during subsequent dedusting operations.
Solution Approach 2:
The invention performs preliminary mixing of catalyst particles with PTFE powder before the extrusion and fiber formation process. This preliminary action ensures that catalyst particles are distributed throughout the PTFE matrix in advance, preventing them from being desorbed or lost during later dedusting operations.
3Reliability
If catalyst is coated on PTFE surface, then denitrification performance is imparted, but catalyst desorption occurs during lamination process
Solution Approach 1:
The invention merges the catalyst with the PTFE fiber structure through mixing before extrusion, rather than coating it on the surface. This integration ensures that during the lamination process, the catalyst remains bound within the fiber matrix and does not desorb, maintaining denitrification performance.
4Ease of manufacture
If organic solvents are used for catalyst coating, then catalyst application is achieved, but manufacturing efficiency is reduced
Solution Approach 1:
The invention replaces the chemical coating process using organic solvents with a mechanical mixing process. Solid catalyst particles are mixed with PTFE powder through mechanical mixing equipment, then the mixture is extruded continuously. This mechanical approach eliminates solvent evaporation steps and simplifies the manufacturing process, improving overall efficiency.
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 method results in a more efficient denitrification catalyst with improved NOx removal performance and reduced catalyst desorption, while allowing for uniform catalyst application and increased filter productivity through optimized drying processes.
Implementation Method 1
catalytic reduction of nitrogen oxides has been used to reduce NOx in exhaust gas
Implementation Method 2
a catalytic reduction process is also called a selective catalytic reduction process, diminishingly SCR (Selective Catalytic Reduction) process
Implementation Method 3
PTFE fibers are hydrophobic fluorine polymer fibers, so there is a problem that an organic solvent should be used for catalyst coating
Data Source
AI summary
Disclosed are a method of manufacturing a high-efficiency denitrification catalyst by adjusting components constituting a denitrification catalyst and a ratio between respective components, a method of modifying the surface of PTFE fibers by extruding, rolling, stretching and slitting a PTFE billet manufactured using mixed solid particles, and a method of producing a PTFE catalyst filter by the methods.