Titanium Oxide Catalyst for Exhaust Gas Purification
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Solution Overview
Problem
Current catalysts for treating exhaust gases fail to effectively remove nitrogen oxides and organic halogen compounds while maintaining low SO2 oxidation rates, leading to performance degradation and pipe corrosion.
Innovation Solution
A titanium oxide catalyst with a specific BET surface area of 85 to 250 m2/g and a crystallization ratio of anatase-type titanium within a defined range, combined with catalytically active components like vanadium and tungsten, is used to control SO2 oxidation and enhance durability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a catalyst is designed to efficiently remove nitrogen oxides and organic halogen compounds, then the catalytic activity is improved, but the SO2 oxidation rate increases causing pipe corrosion and catalyst performance degradation
Solution Approach 1:
The patent applies parameter changes by precisely controlling the BET specific surface area of titanium oxide within 85-250 m2/g and the anatase crystal peak intensity ratio within 15-145%. These parameter optimizations enable the catalyst to achieve high catalytic activity for nitrogen oxide and organic halogen compound removal while maintaining low SO2 oxidation rates, thereby resolving the technical contradiction between productivity and harmful factors
Solution Approach 2:
The patent employs composite materials by combining titanium oxide with specific surface area and crystallization characteristics with catalytically active components such as vanadium and tungsten. This composite structure enables the catalyst to simultaneously achieve high removal efficiency for harmful substances and low SO2 oxidation rates, solving the contradiction between catalytic activity and SO2 oxidation
2Productivity
If the catalyst maintains high performance for removing harmful substances, then the removal efficiency is improved, but the catalyst durability decreases due to performance degradation
Solution Approach 1:
The patent optimizes the BET specific surface area to 85-250 m2/g and the anatase crystal peak intensity ratio to 15-145%, which enables the catalyst to maintain stable performance over long periods. These parameter controls prevent performance degradation while ensuring high removal efficiency for nitrogen oxides and organic halogen compounds, thereby resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent applies beforehand cushioning by pre-optimizing the titanium oxide characteristics and catalytic active component composition before the catalyst is put into service. This preliminary optimization ensures the catalyst has inherent stability and resistance to performance degradation, maintaining high removal efficiency throughout its operational life without sudden failures
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 efficiently and stably removes nitrogen oxides and organic halogen compounds over a long period, reducing SO2 oxidation rates and preventing pipe corrosion, thereby improving catalyst performance and longevity.
Implementation Method 1
a catalyst for treating exhaust gases containing a titanium oxide suitable for removing nitrogen oxides (NOx), organic halogen compounds such as dioxins contained in the exhaust gases discharged from various facilities
Implementation Method 2
The exhaust gases discharged from, for example, incinerators, power plants and refuse incinerators burning heavy oil or coal contain SO2 that is oxidized on a catalyst to SO3
Data Source
AI summary
A catalyst for treating exhaust gases having excellent durability and performance for removing nitrogen oxides and organic halogen compounds and a low SO2 oxidation rate, a titanium oxide suitable for preparing the catalyst and a method for treating exhaust gases containing nitrogen oxides and/or organic halogen compounds using the catalyst are provided.The BET specific surface areas of the titanium oxide and the catalyst for treating exhaust gases are in the range of 85 to 250 m2/g and in the range of 50 to 200 m2/g respectively. The titanium oxide and the catalyst for treating exhaust gases have each a ratio in the range of 15 to 145%, the ratio of the intensity of the peak indicating an anatase crystal present in the range of 2θ=24.7° to 2θ=25.7° of powder X-ray diffraction thereof (Ia) to the intensity of the peak indicating an anatase crystal present in the range of 2θ=24.7° to 2θ=25.7° of powder X-ray diffraction of the standard sample comprising a mixture composed of 15% by mass of pure anatase-type titanium dioxide and 85% by mass of pure rutile-type titanium dioxide (Ib).