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Application of metal oxide modified CePO4 catalyst to collaborative denitration and demercuration

A technology of catalysts and oxides, applied in the direction of physical/chemical process catalysts, chemical/physical processes, chemical instruments and methods, etc., can solve the problems of low mercury oxidation activity and poor sulfur resistance, and achieve easy-to-obtain and good-quality raw materials for preparation SCR active, adaptable effect

Inactive Publication Date: 2015-09-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to overcome the disadvantages of the existing SCR catalysts, such as the low oxidation activity of mercury in the actual flue gas, and the problem of poor sulfur resistance of the existing mercury catalysts, to provide metal oxide modified CePO 4 The application of catalyst synergistic denitrification and mercury removal, the catalyst used in this method has good water and sulfur resistance and strong adaptability

Method used

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  • Application of metal oxide modified CePO4 catalyst to collaborative denitration and demercuration
  • Application of metal oxide modified CePO4 catalyst to collaborative denitration and demercuration

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Effect test

Embodiment 1

[0039] Catalyst preparation:

[0040] (1) Mix cerium nitrate hexahydrate and phosphoric acid at a molar ratio of 1:1, add a certain amount of urea (the molar ratio to cerium nitrate is 2.5), react at 80°C for 2 hours, cool the resulting mixture, let it stand, and wash it A white precipitate of cerium phosphate was obtained.

[0041] (2) Dissolve 0.6 mmol of cobalt nitrate in 200 ml of deionized water, add 0.02 mol of cerium phosphate obtained in step (1), and stir evenly.

[0042] (3) After the mixture obtained in step (2) is dried, it is calcined at 300° C. for 8 hours in an air atmosphere to obtain a catalyst.

Embodiment 2

[0044] Catalyst preparation:

[0045] (1) Mix cerium nitrate hexahydrate and phosphoric acid at a molar ratio of 1:1, add a certain amount of urea (the molar ratio to cerium nitrate is 3), react at 80°C for 2 hours, cool the resulting mixture, let it stand, and wash A white precipitate of cerium phosphate was obtained.

[0046] (2) Dissolve 0.6 mmol of manganese nitrate in 200 ml of deionized water, add 0.02 mol of cerium phosphate obtained in step (1), and stir evenly.

[0047] (3) After the mixture obtained in step (2) is dried, it is calcined at 300° C. for 8 hours in an air atmosphere to obtain a catalyst.

Embodiment 3

[0049] Catalyst preparation:

[0050] (1) Mix cerium nitrate hexahydrate and phosphoric acid in a molar ratio of 1:1, add a certain amount of urea (the molar ratio to cerium nitrate is 2), react at 90°C for 2 hours, cool the resulting mixture, let it stand, and wash A white precipitate of cerium phosphate was obtained.

[0051] (2) Dissolve 0.6 mmol of copper nitrate in 200 ml of deionized water, add 0.02 mol of cerium phosphate obtained in step (1), and stir evenly.

[0052] (3) After the mixture obtained in step (2) is dried, it is calcined at 300° C. for 8 hours in an air atmosphere to obtain a catalyst.

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Abstract

The invention discloses application of a metal oxide modified CePO4 catalyst to collaborative denitration and demercuration. The application includes introducing medium-high temperature flue gas containing elemental mercury and nitrogen oxide into a catalyst loaded catalytic apparatus. Specifically, the main component of the catalyst is cerium phosphate, and the modification component is at least one of cobalt, manganese, copper, iron, vanadium, cerium, molybdenum and tin metal oxides. The temperature of the medium-high temperature flue gas is 250-420DEG C. According to the application of the metal oxide modified CePO4 catalyst to collaborative denitration and demercuration, the oxidation efficiency to null valence mercury in high temperature flue gas is high, the NO is the flue gas can promote and enhance the catalytic efficiency of the catalyst, and the practicability is strong. In addition, the catalyst has good medium-high temperature SCR activity and anti-sulfur and waterproof performance.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a metal oxide modified CePO 4 Application of catalyst synergistic denitrification and demercury removal. Background technique [0002] Mercury is volatile, persistent and bioaccumulative, and thus has great hazards to living organisms. Due to its high volatility and low water solubility, mercury can stay in the atmosphere for as long as half a year to two years, and it is easy to form global pollution through long-distance atmospheric transport. Mercury and its compounds in the atmosphere, mercury-containing pesticides and fertilizers, and mercury in the soil can all be absorbed by plants. When the mercury content in the growth environment is too high, the mercury will quickly accumulate in the plant, causing serious poisoning to the plant, causing the leaves to fall off and wither. Mercury accumulated in plants will enter animals and humans through the food chai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01D53/64B01J27/185B01J27/18B01J27/187B01J27/19B01J27/198
Inventor 翁小乐梅荣军吴忠标刘越王海强
Owner ZHEJIANG UNIV
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