High-Vanadium Denitration Catalyst for Low-Temperature SCR
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Solution Overview
Problem
Current selective catalytic reduction (SCR) technologies using vanadium oxide on titanium oxide carriers require high temperatures for effective nitrogen oxide reduction and are limited by the oxidation of SO2, necessitating the development of a catalyst with high nitrogen oxide reduction activity at lower temperatures without oxidizing SO2.
Innovation Solution
A denitration catalyst with 43 wt% or more vanadium pentoxide and a BET specific surface area of 30 m^2/g or more, supported on titanium oxide, is used at 200°C or lower, produced through methods like impregnation or sol-gel processes, preventing SO2 oxidation and enhancing low-temperature SCR efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vanadium oxide is supported on titanium oxide carrier in conventional amounts (1 wt% or less), then SO2 oxidation is prevented, but nitrogen oxide reduction activity at low temperature is insufficient
Solution Approach 1:
The invention changes the concentration parameter of vanadium oxide from conventional 1 wt% or less to 4 wt% or more, while simultaneously changing the specific surface area parameter to 30 m²/g or more. This parameter transformation allows the catalyst to achieve high nitrogen oxide reduction activity at low temperatures without causing SO2 oxidation, resolving the contradiction between activity and harmful side reactions.
Solution Approach 2:
The invention creates a composite catalyst system combining titanium oxide carrier with high-loading vanadium oxide (4 wt% or more) and specific surface area (30 m²/g or more). This composite structure enables the catalyst to simultaneously achieve high nitrogen oxide conversion efficiency at low temperatures and prevent SO2 oxidation, which neither component could achieve alone in conventional configurations.
2Productivity
If high temperature (350°C to 400°C) is used for SCR reaction, then nitrogen oxide reduction activity is sufficient, but design flexibility and efficiency of SCR systems are reduced
Solution Approach 1:
The invention fundamentally changes the operating temperature parameter from conventional high temperature (350-400°C) to low temperature (200°C or lower). This is achieved by transforming the catalyst properties, specifically increasing vanadium oxide content to 4 wt% or more and specific surface area to 30 m²/g or more, which enables high nitrogen oxide reduction activity at low temperatures and thereby improves design flexibility.
3Productivity
If vanadium oxide content is increased to improve low-temperature activity, then nitrogen oxide reduction efficiency increases, but SO2 oxidation occurs
Solution Approach 1:
The invention creates a specialized composite catalyst where titanium oxide carrier supports high concentrations of vanadium oxide (4 wt% or more) while maintaining a specific surface area of 30 m²/g or more. This composite structure achieves synergistic effects that allow high low-temperature denitration efficiency without triggering SO2 oxidation, resolving the contradiction between improved productivity and harmful side effects.
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 achieves high denitration efficiency at 200°C or lower, with NO conversion ratios exceeding 20% at 120°C and 60% at 150°C, while preventing SO2 oxidation, thus improving the design flexibility and efficiency of SCR systems.
Implementation Method 1
a selective catalytic reduction reaction (NH3-SCR) that uses ammonia (NH3) as a reducing agent... a catalyst in which vanadium oxide is supported on titanium oxide serving as a carrier is widely used as a catalyst for the selective catalytic reduction reaction
Implementation Method 2
an amount of NH3 desorbed by NH3-TPD (TPD: temperature programed desorption) is preferably 10.0 μmol/g or more
Data Source
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AI summary
There is provided a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A denitration catalyst is obtained by coating a substrate with a catalyst component. The catalyst component contains 43 wt% or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more. The denitration catalyst is used for denitration at 200°C or lower.