MnOx/FeOx Denitration Catalyst for Low-Temperature SCR
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Solution Overview
Problem
Existing SCR catalysts based on V2O5/TiO2 require high temperatures and are susceptible to poisoning by particulates and SO2, making them ineffective in low-temperature, high-water vapor environments common in non-power generation industries.
Innovation Solution
A denitration catalyst composed of a calcined reaction product of manganese nitrate and iron nitrate with an alkaline precipitant, having a grain size less than 0.5 μm, which can be prepared by heating the reaction product to 300-500°C, and optionally includes additives like PTFE or CS for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V2O5/TiO2 based catalysts are used for SCR, then high NOx conversion is achieved, but high temperature operation is required and catalyst is susceptible to poisoning
Solution Approach 1:
The patent changes the chemical composition parameters by replacing V2O5/TiO2 with MnOx/FeOx catalyst system, and adjusts operating temperature parameters to function effectively at lower temperatures (100-300°C) while maintaining NOx conversion performance
Solution Approach 2:
The patent uses a composite catalyst material comprising MnOx and FeOx in specific ratios (Mn:Fe = 1:1 to 1:2 molar ratio), combining the catalytic activities of both metals to achieve effective NOx reduction at low temperatures without requiring high temperature operation
2Reliability
If V2O5/TiO2 based catalysts are used for SCR, then high NOx conversion is achieved, but catalyst is susceptible to poisoning by particulates and SO2
Solution Approach 1:
The patent employs MnOx/FeOx catalyst system that is more resistant to poisoning by particulates and SO2 compared to conventional V2O5/TiO2 catalysts, maintaining catalytic activity in polluted environments without requiring frequent replacement or regeneration
Solution Approach 2:
The patent leverages the resistance of MnOx/FeOx catalyst to harmful substances (particulates and SO2) as a beneficial property, allowing the catalyst to maintain high NOx conversion efficiency even in environments with high concentrations of poisoning agents
3Reliability
If conventional SCR catalysts are used, then high NOx conversion is achieved, but performance deteriorates in low-temperature, high-water vapor environments
Solution Approach 1:
The patent modifies the catalyst composition to MnOx/FeOx system with specific Mn:Fe ratios and controls particle size parameters (0.1-10 μm) to enhance catalytic performance in low-temperature, high-humidity environments typical of non-power generation industries
Solution Approach 2:
The patent creates a composite MnOx/FeOx catalyst material that combines the advantages of both metal oxides to achieve both high NOx conversion and adaptability to harsh environmental conditions including low temperature and high water vapor content
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 NOx conversion (up to 99%) over a wide temperature and humidity range, minimizing energy consumption and avoiding catalyst poisoning, suitable for low-temperature SCR applications.
Implementation Method 1
The selective catalytic reduction (SCR) of NOX has been the most widely used technique for the reduction of NOX emissions from combustion flue gas
Implementation Method 2
The calcined reaction product can be provided by calcining a precipitated reaction product prepared from manganese nitrate and iron nitrate in the presence of an alkaline precipitant
Implementation Method 3
calcining the mixed-metal hydroxide salt precipitate to form the denitration catalyst
Data Source
AI summary
The present disclosure generally relates to a denitration catalyst, and in particular to a method for preparing the denitration catalyst. The present disclosure also relates to a method for preparing a coated substrate comprising the denitration catalyst. The present invention also relates to use of the denitration catalyst and/or coated substrate at low temperatures and/or humid environments.