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A denitrification catalyst for synergistic mercury removal and preparation method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as high cost and unreasonable distribution ratio of active ingredients, etc. Achieve the effect of reducing product cost and solving the problem of low mercury oxidation rate

Active Publication Date: 2015-07-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical purpose of the present invention is to solve the defects and deficiencies such as high cost and unreasonable distribution ratio of active components in existing denitrification catalysts that use transition metal halides as oxidants to oxidize elemental mercury, and provide a synergistic denitration denitrification catalyst Catalyst and preparation method thereof, the active ingredient of the catalyst is composed of vanadium pentoxide and molybdenum trioxide, through the addition of molybdenum trioxide and a reasonable proportion, the catalyst can significantly improve catalytic mercury oxidation while maintaining good catalytic denitrification performance efficiency, and can effectively control SO 2 Oxidation to SO 3 ratio, and the catalyst components are simple, reasonable ratio, low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Catalyst of the present invention (TV 5 m 5 ) preparation

[0025] Follow these steps:

[0026] (1) Uniformly mix a quantitative volume of n-tetrabutyl titanate and an equal volume of absolute ethanol at 40°C to obtain a mixed solution;

[0027] (2) According to the ratio of ammonia water and n-tetrabutyl titanate at a volume ratio of 1:3, introduce ammonia water into the mixed solution obtained in step (1), and shake at 40°C for 1 hour to obtain titanium-containing sol A;

[0028] (3) Prepare a citric acid solution with a mass concentration of 10%, take a citric acid solution equal in volume to the ammonia water in step (2), introduce it into sol A, shake it at 40°C for 10 minutes, and obtain sol B;

[0029] (4) Take by weighing the metavanadic acid solid with a vanadium element content of 5 parts by weight, dissolve it in a nitric acid solution equal in volume to the ammoniacal liquor in step (2), obtain solution A, take by weighing 5 parts by weight o...

Embodiment 2

[0032] Embodiment 2 Catalyst of the present invention (TV 5 m 10 ) preparation

[0033] Follow these steps:

[0034] Steps (1) to (3) are the same as in Example 1;

[0035] (4) Take by weighing the metavanadic acid solid with a vanadium element content of 5 parts by weight, dissolve it in a nitric acid solution equal in volume to the ammoniacal liquor in step (2), obtain solution A, and weigh 10 parts by weight of molybdenum trioxide, Dissolved in ammonia water of equal volume to the ammonia water in step (2), to obtain solution B;

[0036] (5) Introduce the solutions A and B obtained in step (4) into sol B with a titanium element content of 85 parts by weight, then use concentrated nitric acid to adjust the pH value of the mixed solution to 1, and shake it at 40°C for 5 hours, then Raise the temperature to 70°C and dry at 70°C for 48 hours to obtain a gel;

[0037] (6) Put the gel obtained in step (5) in a muffle furnace, raise the temperature to 400°C at a heating rate ...

Embodiment 3

[0038] Embodiment 3 Catalyst of the present invention (TV 10 m 5 ) preparation

[0039] Follow these steps:

[0040] Steps (1) to (3) are the same as in Example 1;

[0041] (4) Take by weighing the metavanadic acid solid with a vanadium element content of 10 parts by weight, dissolve it in a nitric acid solution equal to the volume of ammonia in step (2), to obtain solution A, and take by weighing 5 parts by weight of molybdenum trioxide, Dissolved in ammonia water of equal volume to the ammonia water in step (2), to obtain solution B;

[0042] (5) Introduce the solutions A and B obtained in step (4) into sol B with a titanium element content of 85 parts by weight, then use concentrated nitric acid to adjust the pH value of the mixed solution to 1, and shake it at 40°C for 5 hours, then Raise the temperature to 70°C and dry at 70°C for 48 hours to obtain a gel;

[0043] (6) Put the gel obtained in step (5) in a muffle furnace, raise the temperature to 400°C at a heating r...

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PUM

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Abstract

The invention discloses a denitration catalyst for collaborative mercury removal. The denitration catalyst comprises the following components in percentage by mass: 5-10% of vanadium pentoxide, 5-10% of molybdenum trioxide and the balance of titanium dioxide. The preparation method of the catalyst comprises the following steps: mixing tetra-n-butyl titanate, absolute ethyl alcohol, ammonia water and a citric acid solution, and shaking to obtain a titanium-containing sol; respectively dissolving metavanadic ammonia acid and molybdenum trioxide into the ammonia water to obtain a mixed solution, then leading the mixed solution into the sol, shaking and drying to obtain a gel; calcining and grinding the gel to obtain the denitration catalyst. The denitration catalyst for collaborative mercury removal can be used for significantly improving the efficiency of catalyzing and oxidizing mercury and controlling the ratio of oxidizing SO2 into SO3, and the catalyst is simple in component, reasonable in proportion and low in cost. The components in the catalyst prepared by the sol-gel method provided by the invention for preparing the catalyst have good dispersity, so that uniform doping of all active components at the molecular level is well realized.

Description

technical field [0001] The invention relates to a denitrification catalyst for synergistic mercury removal and a preparation method thereof, belonging to the technical field of air pollution purification. Background technique [0002] Coal is the most abundant fossil fuel resource. China is the world's largest coal producer and consumer. Since the 1990s, my country's coal production and consumption have been ranked first in the world for a long time. The burning of coal, especially the operation of coal-fired power plants, will bring about serious environmental pollution problems. Mercury and nitrogen oxides emitted by coal-fired power plants are the main sources of human-induced emissions into the atmosphere. Mercury released into the atmosphere will accumulate in the human body after entering the biosphere, causing damage to the nervous system of the human body and seriously endangering human health. while nitrogen oxides (NO x ) will cause local environmental problems s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28
Inventor 刘小伟徐明厚赵波斯俊平王超周子健
Owner HUAZHONG UNIV OF SCI & TECH