Manganese-lanthanum double-element gradient doped calcium-based desulfurizing agent and preparation method thereof

Manganese-lanthanum dual-element calcium-based desulfurizers were prepared by sol-gel method and gradient doping technology, which solved the problems of complex preparation process and poor stability of calcium hydroxide, achieved efficient and stable SO2 adsorption effect, and reduced fly ash generation.

CN121892079APending Publication Date: 2026-04-21EVERBRIGHT ENVIRONMENTAL TECH CHINA CO LTD
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Patent Information

Application Number
CN202610124977.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-29
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

Existing calcium hydroxide preparation processes are complex and costly, and their deacidification efficiency is low under medium-high temperature and low water conditions. They also involve large amounts of fly ash from medium-low temperature spraying and low content of traditional dopants, resulting in poor stability of the desulfurizing agent.

Method used

A calcium-based desulfurizer with manganese-lanthanum dual-element gradient doping was prepared by sol-gel method. The gradient doped material was formed by programmed temperature calcination and heat treatment. By utilizing the difference in diffusion rates of Mn2+ and La3+ ions, a doped structure with high internal concentration and low surface concentration was formed, which improved electron mobility and material stability.

Benefits of technology

It significantly improves the specific surface area and pore structure of the material, enhances its stability and SO2 selective adsorption capacity in medium-high temperature and low water environments, improves desulfurization efficiency, and reduces fly ash generation.

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Abstract

The invention discloses a manganese-lanthanum double-element gradient doped calcium-based desulfurizing agent and a preparation method thereof, and belongs to the technical field of flue gas purification. The method comprises the following steps: preparing a precursor, namely mixing calcium hydroxide, manganous nitrate and lanthanum nitrate, and preparing the precursor by adopting a sol-gel method; gradient doping control: calcining through temperature programming, and forming a gradient doping material by utilizing the diffusion rate difference of Mn < 2 + > and La < 3 + > ions; surface electron structure regulation and control: carrying out heat treatment on the gradient doped material in an inert atmosphere, replacing Ca < 2 + > with Mn < 2 + > to form oxygen vacancy, and improving electron mobility; la < 3 + > forms a La-O-Ca bond on the surface, so that the surface energy is reduced. The preparation method is efficient, the prepared desulfurizing agent has high activity and stability, acid gas in flue gas can be effectively removed, and the problems that an existing material is low in deacidification efficiency in a medium-high-temperature low-water environment and large in medium-low-temperature spraying fly ash amount are solved.
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