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A kind of coke oven flue gas low temperature denitration catalyst and preparation method thereof

A low-temperature denitration and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor water and sulfur resistance of Mn-based catalysts, insufficient catalyst denitration rate, and high price. Achieve the effect of inhibiting SO2 oxidation, low production cost, and reduced dosage

Active Publication Date: 2021-12-03
淄博恒亿化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there are currently a small number of coke oven flue gas denitrification projects in China that have been demonstrated and applied, there are Mn-based catalysts with poor water and sulfur resistance (requires extremely low sulfur content), expensive (up to 80,000-100,000 / cubic), and low space velocity. (about 2500h -1 ), catalyst denitrification rate is not high enough (mostly around 85-90%) and other series of problems

Method used

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  • A kind of coke oven flue gas low temperature denitration catalyst and preparation method thereof
  • A kind of coke oven flue gas low temperature denitration catalyst and preparation method thereof
  • A kind of coke oven flue gas low temperature denitration catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] A low-temperature denitrification catalyst for coke oven flue gas, prepared from the following raw materials in parts by weight:

[0033]

[0034]

[0035] The preparation method of the above coke oven flue gas low-temperature denitrification catalyst, the steps are as follows:

[0036] 1) Dry diatomaceous earth, titanium dioxide, and molecular sieves in a vacuum oven at 60°C for 8 hours, and cool down to room temperature;

[0037] 2) Add ammonium tungstate and ammonium metavanadate to the mixing tank, mix with a certain amount of water and stir at a speed of 100r / min for 2 hours, then add diatomite, titanium dioxide and molecular sieve pretreated in step 1) , continue to stir for 2h;

[0038] 3) placing the stirred product in step 2) in a muffle furnace, and calcining at 300° C. for 5 hours to obtain the corresponding oxide active centers tungsten trioxide and vanadium pentoxide;

[0039] 4) adding stearic acid, polyoxyethylene, monoethanolamine, lactic acid, c...

Embodiment 2

[0047] The preparation method and product are the same as in Example 1, only the composition of the simulated flue gas is changed, and the application is as follows:

[0048] Taking 0.50g of the catalyst of the present invention as the experimental object, within the temperature range of 240-300°C, the space velocity is 3500h -1 , the simulated flue gas composition is: 1000ppm NO, NH 3 / NO=1.1, 5%O 2 , 400ppm SO 2 , 10%H 2 O, the balance gas is N 2 , its denitrification efficiency is 95% at 240°C and 96.8% at 300°C.

Embodiment 3

[0050] A low-temperature denitrification catalyst for coke oven flue gas, prepared from the following raw materials in parts by weight:

[0051]

[0052] The preparation method of the above coke oven flue gas low-temperature denitrification catalyst, the steps are as follows:

[0053] 1) Dry diatomaceous earth, titanium dioxide, and molecular sieves in a vacuum oven at 80°C for 3 hours, and cool down to room temperature;

[0054] 2) Add ammonium tungstate and ammonium metavanadate to the mixing tank, mix with a certain amount of water and stir at a speed of 200r / min for 1 hour, then add diatomite, titanium dioxide and molecular sieve pretreated in step 1) , continue to stir for 1h;

[0055] 3) placing the stirred product in step 2) in a muffle furnace, and calcining at 500° C. for 3 hours to obtain the corresponding oxide active centers tungsten trioxide and vanadium pentoxide;

[0056] 4) adding stearic acid, polyoxyethylene, monoethanolamine, lactic acid, carboxymethyl ...

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Abstract

The invention discloses a low-temperature denitrification catalyst for coke oven flue gas, and relates to the fields of air pollution control and environmental catalytic materials. The coke oven flue gas low-temperature denitrification catalyst is prepared from the following raw materials in parts by weight: 13 parts of diatomite; 20 parts of titanium dioxide; 25 parts of molecular sieves; 8-12 parts of ammonium tungstate; 7-10 parts of ammonium metavanadate 10-13 parts of stearic acid; 15-20 parts of polyethylene oxide; 20-25 parts of monoethanolamine; 15-25 parts of lactic acid; 15-20 parts of carboxymethyl cellulose; 9-13 parts of manganese trioxide. The beneficial effects of the present invention are: the denitrification catalyst prepared by the present invention has good low-temperature activity, strong water and sulfur resistance, long service life, wide application temperature, very suitable for coke oven flue gas conditions, and high catalyst use space velocity, which can make the catalyst The consumption is greatly reduced, and at the same time, the production cost of the catalyst is low, and the price is far lower than that of the existing market catalysts.

Description

technical field [0001] The invention mainly relates to the fields of air pollution control and environmental catalytic materials, in particular to a low-temperature denitrification catalyst for coke oven flue gas and a preparation method thereof. Background technique [0002] Iron and steel is a pillar industry in my country, and coke is an important raw material for ironmaking. There are about 520 coking plants in my country, including about 440 independent coking plants, and the rest are internal coking plants of iron and steel enterprises. The national standard "Emission Standard of Pollutants for Coking Chemical Industry" (GB16171-2012), which came into effect in October 2012, for the first time included nitrogen oxides (NOx) emitted from coke oven chimneys. x ) is listed as the control index for the emission of air pollutants in coking enterprises in my country, and it is clearly required that: from January 1, 2015, NO x The concentration requirement is less than 500m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/00B01J29/03B01J29/076B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01D2258/0283B01J29/00B01J29/03B01J29/076B01J2229/18
Inventor 杨公平
Owner 淄博恒亿化工科技有限公司
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