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Cerium phosphate-based catalyst for zero-valent mercury oxidation, preparation method and application

A cerium phosphate-based, catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of large influence of zero-valent mercury oxidation activity, poor mercury oxidation effect, etc., to get rid of dependence. performance, easy operation, and easy availability of raw materials

Active Publication Date: 2016-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Although the above two disclosed alum-based catalysts have good anti-sulfur effects, their zerovalent mercury oxidation activity is greatly affected by the components of the flue gas, especially the dependence on HCl in the flue gas is strong, and in the actual flue gas Oxidation of mercury is poor under conditions

Method used

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  • Cerium phosphate-based catalyst for zero-valent mercury oxidation, preparation method and application
  • Cerium phosphate-based catalyst for zero-valent mercury oxidation, preparation method and application
  • Cerium phosphate-based catalyst for zero-valent mercury oxidation, preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Catalyst preparation:

[0038] (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 to 3), react at 80°C for 2 hours, cool the resulting mixture, let it stand, After washing, a white precipitate of cerium phosphate was obtained.

[0039] (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. (the same below)

[0040] (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

[0042] Catalyst preparation:

[0043] (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 to 3), react at 80°C for 2 hours, cool the resulting mixture, let it stand, After washing, a white precipitate of cerium phosphate was obtained.

[0044] (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.

[0045] (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

[0047] Catalyst preparation:

[0048] (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 to 3), react at 90°C for 2 hours, cool the resulting mixture, let it stand, After washing, a white precipitate of cerium phosphate was obtained.

[0049] (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.

[0050] (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 a cerous phosphate based catalyst for zero-valent mercury oxidation. The catalyst is mainly composed of cerous phosphate, and comprises modification components; wherein the modification components are composed of at least one oxide of cobalt, manganese, copper, iron, vanadium, cerium, molybdenum, tin, and the like. The invention also discloses a preparation method and applications of the catalyst. The preparation process is simple, and the operation is convenient. Compared to the prior art, the catalyst has the following advantages: (1) the active components of the catalyst are all common metal oxides, the common metal phosphate is taken as the carrier, the raw materials are simple and easily available, and the operation is convenient; (2) the catalyst has a very good sulfur-resistant performance; (3) the CePO4 catalyst, which has been modified by metal oxides, is well adapt to the flue gas. The provided catalyst can fully utilizes the NO in flue gas to greatly promote the oxidation of zero-valent mercury. The great dependence on HCl of conventional catalysts is gotten rid of.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a cerium phosphate-based catalyst modified with metal oxides, a preparation method and application. 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 chain and ...

Claims

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Application Information

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