Preparation method of modified vanadium-iron denitration catalyst

By using a tungsten- and molybdenum-free raw material system and a citric acid chelation masking and phosphorus modification sequential decoupling process, the problems of high cost and structural instability of vanadium-based denitration catalysts were solved, achieving high stability and high efficiency of catalyst performance, making it suitable for industrial-scale production.

CN122098633BActive Publication Date: 2026-07-24ZHONGDE CHENXI ENVIRONMENTAL PROTECTION ENG CO LTD
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Patent Information

Application Number
CN202610552321.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-04-24
Publication Date
2026-07-24
Estimated Expiration
2046-04-24

AI Technical Summary

Technical Problem

Existing vanadium-based denitration catalysts rely on expensive additives such as tungsten and molybdenum, resulting in high costs and unstable catalytic structures. During industrial-scale production, the active components are prone to agglomeration and uneven dispersion, and the catalytic activity is easily reduced at high temperatures. The honeycomb structure is also prone to cracking and channel collapse, making it difficult to guarantee catalytic efficiency and service life.

Method used

Using a tungsten- and molybdenum-free raw material system, a V-Fe-Cu-P composite catalytic structure was constructed through citric acid chelation masking and phosphorus modification sequential decoupling processes, combined with techniques such as buried material dripping, weakly alkaline pH closed-loop linkage, intermittent mixing, and segmented calcination. This achieved molecular-level uniform dispersion of vanadium, iron, copper, and phosphorus elements and anchoring of phosphorus, thus optimizing the performance of the honeycomb structure.

Benefits of technology

It achieves low cost, high stability and sulfur resistance, improves batch consistency and service life of catalyst, avoids catalytic structure instability and activity decay, and ensures the integrity of honeycomb structure and catalytic efficiency.

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Abstract

The application discloses a preparation method of a modified vanadium-iron denitration catalyst and relates to the technical field of catalysis. The application does not need to introduce tungsten-containing and molybdenum-containing raw materials in the whole process. A vanadium source alkaline solution and a citric acid chelated iron-copper chelated solution are prepared, a double-stage mixing in-situ composite process is adopted, the iron-copper chelated solution is added into a premixed material of a carrier and a vanadium source in a buried material type dropping mode, a linkage control system pH is stabilized, a V-Fe-Cu-O ternary solid solution is formed, then phosphorus elements are embedded and a molding aid is added to mix and form a plastic mud material, after aging, extrusion molding and gradient drying, the material is calcined in an oxidative atmosphere in stages, and a stable V-Fe-Cu-P composite solid solution is formed. Through time sequence decoupling and precise process control, the application realizes uniform dispersion of active component molecules at a molecular level, improves the denitration activity, mechanical strength and sulfur deactivation resistance of the catalyst, and the process is simple and suitable for industrial scale production.
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