Supported Solid-Phase Catalyst for Magnesium Sulfite Oxidation
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Solution Overview
Problem
The magnesium desulfuration process faces issues with low oxidation rates of magnesium sulfite, leading to system scaling, blocking, and secondary pollution due to insufficient catalyst recovery and high operation costs in medium-sized and small-sized industrial boilers.
Innovation Solution
A supported solid-phase catalyst using activated carbon as a support with cobalt nitrate, manganese nitrate, and ferrous nitrate as catalytically active components, with a specific molar ratio, is developed for enhanced oxidation of magnesium sulfite, allowing for easy recovery and reduced secondary pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transitional metal catalyst is added in solution form to improve oxidation capacity, then oxidation rate is improved, but operation cost increases and secondary pollution occurs
Solution Approach 1:
The patent uses activated carbon with porous structure as support material to carry metal catalyst particles. The porous structure provides large surface area for catalyst dispersion and facilitates mass transfer, while the solid-phase form enables easy separation from the liquid system, preventing secondary pollution and enabling catalyst recovery.
Solution Approach 2:
The patent creates a composite catalyst system consisting of metal particles (Co, Mn, Cu, Fe) dispersed on activated carbon support. This composite structure combines the high catalytic activity of metal particles with the adsorption and structural stability of activated carbon, achieving both high oxidation rate and easy recovery.
2Productivity
If transitional metal catalyst is added in solution form to improve oxidation capacity, then oxidation rate is improved, but operation cost increases
Solution Approach 1:
The activated carbon support provides a solid matrix that allows the catalyst to be easily separated from the reaction mixture through filtration or sedimentation, eliminating the need for complex recovery processes and reducing operation costs while maintaining high oxidation rates.
Solution Approach 2:
The solid-phase catalyst can be easily recovered from the reaction system through simple filtration or sedimentation processes, allowing for reuse and significantly reducing operation costs compared to solution-based catalysts that require complex recovery methods.
3Productivity
If conventional catalyst is used to improve oxidation capacity, then oxidation rate is improved, but catalyst recovery becomes difficult
Solution Approach 1:
The activated carbon support provides a solid, filterable matrix that carries the catalyst particles, enabling easy separation from the liquid reaction mixture through filtration or sedimentation, thus greatly simplifying catalyst recovery operations.
Solution Approach 2:
The catalyst is extracted from the solution phase and immobilized on a solid support (activated carbon), allowing for easy physical separation and recovery from the reaction system through filtration or decantation, solving the catalyst recovery problem.
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 significantly increases the oxidation rate of magnesium sulfite, prevents system scaling, and reduces operational costs by being easily recoverable and reusable, making it suitable for medium-sized and small-sized boilers.
Implementation Method 1
heating and refluxing the activated carbon particle in a nitric acid solution
Implementation Method 2
oxidized to produce a magnesium sulfate solution... oxidation reaction rate of magnesium sulfite... adding transitional metal catalyst... significantly improve the oxidation capacity
Implementation Method 3
standing under microwave irradiation
Data Source
AI summary
The present invention belongs to the flue gas desulfuration field. Specifically, the present invention relates to a supported solid-phase catalyst for oxidizing the by-product magnesium sulfite in a magnesium desulfuration process, and to preparation method and use thereof. The catalyst uses an activated carbon particle as a support, and cobalt nitrate, manganese nitrate, copper nitrate and ferrous nitrate as catalytically active components. The preparation method is as follows: mixing the pre-treated activated carbon support with the catalytically active components, followed by oscillating, standing under microwave irradiation, filtrating, drying, baking, so as to obtain the supported solid-phase catalyst. Raw materials of the present invention are inexpensive and easily available; the preparation process is simple; the catalyst has prominent catalytic effect and can be widely used in the magnesium desulfuration process in medium-sized and small-sized boilers of 75t or more to improve the recovery rate of the desulfuration by-product and reduce energy consumption of the oxidation system; the catalyst has a low amount of catalytically active components and causes low residue in the solution and hence no secondary pollution problem, and has a high generalization value.