Dry Desulfurizing Agent Using Transition Metal Oxides
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Solution Overview
Problem
Current methods for dry desulfurization and denitrification of flue gas are either complex, costly due to the use of rare earth metals, or lack effectiveness in both desulfurization and denitrification processes.
Innovation Solution
A dry desulfurizing and denitrificating agent composed of TiO2, ZrO2, V2O5, CoO, Co2O3, Fe2O3, MnO2, and KMnO4, prepared through a method involving stirring, addition of aqueous ammonia, and calcination, which is used to contact flue gas and then absorbent magnesium oxide to remove sulfur dioxide and nitrogen oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rare earth metal compounds are used as active component in denitrification catalyst, then denitrification rate can reach above 95%, but the cost increases significantly
Solution Approach 1:
The patent replaces expensive rare earth metal compounds with cheaper alternative materials (such as transition metal oxides like MnO2, Co3O4, Fe2O3) that can achieve comparable denitrification performance. This substitution directly addresses the cost issue while maintaining the high denitrification rate requirement.
Solution Approach 2:
The patent optimizes various parameters including the composition ratios of metal oxides, particle size distribution (0.8-15 μm), and preparation conditions (calcination temperature, stirring speed) to achieve high denitrification efficiency without relying on expensive rare earth metals. The multi-component oxide system works synergistically to replace rare earth functionality.
2Productivity
If active carbon based catalyst with honeycomb shape is prepared using phenolic resin or furan resin as adhesive, then desulfurization capacity and NO conversion are achieved, but the preparation process becomes complex
Solution Approach 1:
The patent removes the adhesive step (phenolic or furan resin) from the preparation process. Instead of forming honeycomb structures with adhesive-bonded active carbon particles, the invention uses directly sintered or agglomerated metal oxide particles that achieve both structural integrity and catalytic function without requiring organic adhesives.
Solution Approach 2:
The metal oxide particles serve multiple functions simultaneously: they provide the catalytic active sites for desulfurization and denitrification, form the structural framework, and eliminate the need for separate adhesive components. This multi-functionality simplifies the overall preparation process while maintaining effectiveness.
3Productivity
If multiple metal compounds are mixed and active carbon is dispersed to create desulfurization catalyst, then high desulfurization rate is achieved, but the preparation method requires many kinds of raw materials and complex steps
Solution Approach 1:
The patent combines desulfurization and denitrification functions into a single catalyst formulation using a synergistic mixture of metal oxides (MnO2, Co3O4, Fe2O3, TiO2, ZrO2). This unified catalyst eliminates the need for separate desulfurization and denitrification catalysts, simplifying both the preparation process and the number of raw materials required while maintaining high performance for both functions.
Solution Approach 2:
The invention uses composite metal oxide materials where different oxides work synergistically. The composite structure provides multiple active sites for different reactions (SO2 oxidation and NO reduction) within a single catalyst system, reducing the need for multiple separate catalyst preparation steps and raw material inventories.
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 solution achieves high desulfurization and denitrification rates with low energy consumption and cost, without the need for rare earth metals, improving the overall performance and environmental impact.
Implementation Method 1
TiO2 30-60 parts by weight, ZrO2 9-30 parts by weight, V2O5 2-10 parts by weight, CoO 2-10 parts by weight, Co2O3 1-8 parts by weight, Fe2O3 2-10 parts by weight, MnO2 5-15 parts by weight, and KMnO4 2-10 parts by weight
Implementation Method 2
the catalyst has a high desulfurization rate... nitrogen oxides are reduced... desulfurization and denitrification of flue gas
Implementation Method 3
contact flue gas and then absorbent magnesium oxide to remove sulfur dioxide and nitrogen oxides
Data Source
AI summary
The present disclosure discloses a dry desulfurizing and denitrificating agent and its preparation method and applications. The desulfurizing and denitrificating agent is made of raw materials comprising the following components based on 100 parts by weight of the desulfurizing and denitrificating agent: 30-60 parts by weight of TiO2, 10-30 parts by weight of ZrO2, 2-10 parts by weight of V2O5, 2-10 parts by weight of CoO, 1-8 parts by weight of Co2O3, 2-10 parts by weight of Fe2O3, 5-15 parts by weight of MnO2, and 2-10 parts by weight of KMnO4. The desulfurizing and denitrificating agent of the present disclosure has a good catalytic oxidation performance on sulfur dioxide and nitrogen oxides of flue gas, and a high rate of desulfurization and denitrification.