Low-cost flue gas denitration catalyst and preparation and use methods thereof

A denitrification catalyst and low-cost technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of active component toxicity and high catalyst cost, achieve simple equipment and process, reduce denitrification cost, and high Effect of Catalytic Reduction on Denitrification Performance

Inactive Publication Date: 2019-05-24
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of high catalyst cost and strong toxicity of active components in the existing denitrific

Method used

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  • Low-cost flue gas denitration catalyst and preparation and use methods thereof
  • Low-cost flue gas denitration catalyst and preparation and use methods thereof
  • Low-cost flue gas denitration catalyst and preparation and use methods thereof

Examples

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preparation example Construction

[0031] A method for preparing a low-cost flue gas denitrification catalyst, comprising the steps of:

[0032] 1) Dry the fly ash to constant weight;

[0033] 2) Dissolve the solid metal salt in deionized water to obtain a metal salt solution, mix the fly ash and the metal salt solution evenly in an autoclave, and soak the mixture for 20-40min at a pressure of 3-6MPa and a temperature of 40-60°C. Cool to room temperature, add ammonia water dropwise, until the pH of the solution is 9-10, continue mechanical stirring for 0.5-1h, take out the mixture for suction filtration, and dry again to constant weight;

[0034] 3) Put the dried product obtained in step 2) into a fixed-bed reactor, and under the protection of a nitrogen atmosphere, heat up to 600-700°C in a crucible furnace and pass in water vapor for calcination and gasification for 15-30min, and then cool down to room temperature. Get a catalyst.

[0035] In the metal salt solution, the mass-to-volume ratio of metal ions t...

Embodiment 1

[0041] Weigh the analytically pure Fe(NO 3 ) 2 9H 2O was added into 100ml of deionized water and dissolved evenly to obtain ferric nitrate solutions with Fe contents of 10g / 100ml of water respectively. Put the fly ash with a particle size of 120-200 mesh into a vacuum oven, and vacuum-dry at 105°C until constant weight. Weigh 100g of dry fly ash, put it into the autoclave together with the ferric nitrate solution, soak it for 0.5h at a pressure of 5MPa and a temperature of 50°C, cool the sample to room temperature, add a certain amount of ammonia water, until the pH value of the solution reaches 9 -10, continue ultrasonic impregnation for 1 hour, then cool naturally to room temperature, take out, filter with suction, and dry again in a vacuum oven at 105°C to constant weight. Put 10g of the dried catalyst precursor sample into the fixed-bed reaction device, under the protection of nitrogen atmosphere, heat the fixed-bed reaction device to 700°C, and then pass in 0.015ml / min...

Embodiment 2

[0043] Weigh analytically pure Fe(NO 3 ) 2 9H 2 O and Cu(NO 3 ) 2 ·5H 2 O, add 100ml deionized water, dissolve evenly, obtain the mixed nitrate solution that Fe and Cu content are 9.5g / 100ml and 0.5g / 100ml water respectively. Put the fly ash sieved to 120-200 mesh into a vacuum oven, and vacuum dry at 105°C until constant weight. Weigh 100g of dry fly ash, put it into the autoclave together with the above-mentioned nitrate mixed solution, soak it for 0.5h at a pressure of 5MPa and a temperature of 50°C, cool the sample to room temperature, add a certain amount of ammonia water, until the pH of the solution reaches 9-10, continue ultrasonic impregnation for 1 hour, then cool naturally to room temperature, take out, filter with suction, and dry again in a vacuum oven at 105°C to constant weight. Put 10g of the dried catalyst precursor sample into the fixed-bed reaction device, under the protection of nitrogen atmosphere, heat the fixed-bed reaction device to 700°C, and the...

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Abstract

The invention relates to a low-cost flue gas denitration catalyst, which is a fly ash supported metal ion catalyst prepared from metal salt and fly ash. The mass ratio of metal to fly ash in the catalyst is 1:20-1:10. The processes of the thermal decomposition of the fly ash of a power plant and the precursor of an active component and the uniform distribution of the active component is integrated. The surface of the fly ash of the power plant is smooth and compact, the pores of the fly ash are developed by using a high-pressure reaction kettle, the pore structure is richer, meanwhile, the steam activation is adopted, so that the active components are more fully and uniformly distributed on the surface of the fly ash of a carrier; the active component of the catalyst, iron-zinc-copper metal oxide, exists in the nanometer-scale particle size, so that the denitration efficiency of the catalyst is improved and the effective denitration time is prolonged; the catalyst has higher denitration efficiency, high denitration precision and strong capability of removing NOX in flue gas; the catalyst carrier fly ash raw material is cheap and easy to obtain, has no secondary pollution and reduces the cost; the equipment process is simple and the investment cost is low.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a low-cost flue gas denitrification catalyst and its preparation and use methods. Background technique [0002] Coal is currently one of the main energy sources in my country, and coal-fired power plant boilers emit a large amount of SO 2 , NO X , mercury, particles and other trace elements, are the emission of SO 2 and NO X Major industries such as pollutants. Especially in recent years, with the formation and spread of large-scale smog weather across the country, the air pollution caused by coal burning has attracted great attention from the government and the public. At the same time, in the process of burning coal, a large amount of solid waste such as fly ash will be produced, polluting the environment. The utilization of fly ash in my country is still at a low level, how to efficiently develop and deeply utilize fly ash is also a hot issue that people ...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J35/10B01D53/86B01D53/56
Inventor 余江龙窦金孝赵永奇柴红宁段晓谞张春霞赵小蕙
Owner UNIV OF SCI & TECH LIAONING
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