MoV2O8 Surface Catalyst for Mercury Oxidation
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Solution Overview
Problem
Conventional catalysts face challenges in efficiently oxidizing metal mercury in exhaust gas at high temperatures and low halogen concentrations, leading to decreased mercury oxidation rates and increased SO2 oxidation, requiring increased catalyst quantities.
Innovation Solution
A catalyst with a molybdenum and vanadium complex oxide (Mo—V complex oxide) is used, specifically MoV2O8, applied only on the surface of a plate-like or honeycomb-like porous carrier, which enhances mercury oxidation performance without increasing SO2 oxidation, using a diluent like silica, titania, or zirconia to control active ingredient distribution and improve abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the amount of catalyst is increased to improve mercury oxidation activity, then the oxidation activity of metal mercury can be improved, but the oxidation activity of SO2 also increases
Solution Approach 1:
The patent applies local quality by creating a catalyst with non-uniform distribution of active components. The Mo-V complex oxide is concentrated in specific regions or phases within the catalyst structure, allowing high mercury oxidation activity in those local zones while maintaining low SO2 oxidation activity in other regions. This spatial differentiation of catalytic function resolves the contradiction between enhancing mercury oxidation and suppressing SO2 oxidation.
Solution Approach 2:
The patent uses composite materials by combining Mo-V complex oxide with a carrier material to create a multi-component catalyst system. The composite structure allows the Mo-V complex oxide to provide selective mercury oxidation activity while the carrier material provides structural support and controls the overall catalytic behavior, enabling high mercury oxidation activity without proportionally increasing SO2 oxidation activity.
2Productivity
If conventional catalysts are used to oxidize metal mercury, then mercury oxidation can occur, but the oxidation rate decreases when exhaust gas temperature is high and halogen compound concentration is low
Solution Approach 1:
The patent applies parameter changes by utilizing the specific chemical properties of the Mo-V complex oxide that remain effective across a wide range of operating conditions. The complex oxide maintains its catalytic activity for mercury oxidation at high temperatures and low halogen concentrations where conventional catalysts fail, demonstrating changed parameters of temperature and halogen concentration tolerance.
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 Mo—V complex oxide catalyst achieves higher mercury oxidation rates than conventional catalysts while maintaining low SO2 oxidation rates, ensuring efficient mercury removal without increasing catalyst quantity or enhancing SO2 oxidation performance.
Implementation Method 1
a catalyst containing a molybdenum and vanadium complex oxide (Mo—V complex oxide) as a main component having a catalytic activity and having the Mo—V complex oxide in layers only on a surface of a plate-like or honeycomb-like porous carrier
Implementation Method 2
oxidizing it into oxide-form mercury having a low vapor pressure
Data Source
AI summary
A catalyst is provided having higher mercury oxidation performance than a conventional catalyst without increasing catalyst quantity or enhancing SO2 oxidation performance and constitutes an oxidation catalyst for metal mercury, which contains a molybdenum and vanadium complex oxide, for example, MoV2O8, as a main component having a catalytic activity and is formed by placing the molybdenum and vanadium complex oxide in layers only on the surface of a plate-like or honeycomb-like porous carrier. The porous carrier contains Ti and W and has a function of an NOx removal catalyst as a whole.