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Preparation method of molecular sieve-based low-temperature environment-friendly SCR denitration catalyst

The technology of denitration catalyst and molecular sieve is applied in the field of preparation of molecular sieve-based low-temperature environment-friendly SCR denitration catalyst, which can solve the problems of narrow active temperature window, catalyst soot poisoning and deactivation, loss of secondary pollution, etc.

Active Publication Date: 2021-04-16
CNOOC TIANJIN CHEM RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: because the existing V-W-Ti type SCR denitration catalyst has a relatively high service temperature and a narrow active temperature window, the active component can be SO2 is oxidized to SO3 to corrode equipment, and it is easy to be lost to cause secondary pollution, and the catalyst is easy to be poisoned and deactivated by soot during the reaction.

Method used

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  • Preparation method of molecular sieve-based low-temperature environment-friendly SCR denitration catalyst
  • Preparation method of molecular sieve-based low-temperature environment-friendly SCR denitration catalyst
  • Preparation method of molecular sieve-based low-temperature environment-friendly SCR denitration catalyst

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Effect test

Embodiment 1

[0042] Take 5% Fe 2 o 3 / ZSM-5 molecular sieve 50g was added to 142.3g of water, so that the molecular sieve content was 26wt%. Add 85wt% formic acid solution under stirring condition to adjust pH=2.85. The cordierite powder was sieved through a 60-mesh sieve, and 9 g was added to 25.6 g of water, so that the mass fraction of cordierite was 26 wt%. Add 85wt% formic acid solution under stirring condition to adjust pH=2.85, and the mass ratio of cordierite to molecular sieve is 18%. Add 20g of pseudo-boehmite to 230g of water, the mass content of pseudo-boehmite in the slurry is 8wt%, add 85wt% formic acid solution under stirring conditions, adjust pH=3.65, the mass ratio of pseudo-boehmite to molecular sieve is 40%. The above-mentioned various slurries were stirred for 5 hours for later use. Use an 80-mesh sieve to sieve the scallop powder, take 3g and add it to water to disperse evenly. Under the condition of stirring, mix the above slurry into the pseudo-boehmite slurry...

Embodiment 2

[0045] Take 9% Fe 2 o 3 / ZSM-5 molecular sieve 50g was added to 142.3g of water, so that the molecular sieve content was 26wt%. Add 75wt% acetic acid solution under stirring condition to adjust pH=3.0. The mullite powder was sieved through a 60-mesh sieve, and 9 g was added to 25.6 g of water, so that the mass fraction of mullite was 26 wt%. Add 75wt% acetic acid solution under stirring condition to adjust pH=3.0, and the mass ratio of cordierite to molecular sieve is 18%. Add 20g of pseudo-boehmite to 230g of water, the mass content of pseudo-boehmite in the slurry is 8wt%, add 75wt% acetic acid solution under stirring conditions, adjust pH=3.7, the mass ratio of pseudo-boehmite to molecular sieve is 40%. The above-mentioned various slurries were stirred for 5 hours for later use. Sieve the starch through a 80-mesh sieve, take 3g and add it into water to disperse evenly. Under the condition of stirring, mix the above slurry into the pseudo-boehmite slurry, stir for 1.5 ho...

Embodiment 3

[0048] Take 5% Fe 2 o 3 / ZSM-5 molecular sieve 50g was added to 142.3g of water, so that the molecular sieve content was 26wt%. Concentrated nitric acid was added under stirring condition to adjust pH=2.9. The cordierite powder was sieved through a 60-mesh sieve, and 9 g was added to 25.6 g of water, so that the mass fraction of mullite was 26 wt%. Concentrated nitric acid was added under agitation to adjust the pH to 2.9, and the mass ratio of cordierite to molecular sieve was 18%. Add 20g of pseudo-boehmite to 230g of water, the mass content of pseudo-boehmite in the slurry is 8wt%, add concentrated nitric acid under stirring conditions, adjust pH=3.7, and the mass ratio of pseudo-boehmite to molecular sieve is 40% . The above-mentioned various slurries were stirred for 5 hours for later use. Use an 80-mesh sieve to sieve the scallop powder, take 1g and add it to water to disperse evenly. Under the condition of stirring, mix the above slurry into the pseudo-boehmite sl...

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Abstract

The invention discloses a preparation method of a molecular sieve-based low-temperature environment-friendly SCR denitration catalyst, which comprises the following steps: by using a ZSM-5 molecular sieve as a carrier and Fe2O3 modified or supported Fe2O3 and CuO as active components, mixing with ceramic powder, a binder and an additive under acidic conditions, stirring, kneading or coating to obtain the molecular sieve-based low-temperature environment-friendly SCR denitration catalyst. The catalyst prepared by the invention can efficiently remove nitrogen oxide under a low-temperature condition, and has the advantages of reducing the denitration reaction temperature, widening the active temperature window of the denitration process and improving the design flexibility of the denitration and desulfurization process flow. The advantages of water vapor aging resistance, good stability and the like are realized. In the preparation process of the catalyst, the raw materials are cheap and easy to obtain, the preparation cost is low, harmful substances with secondary pollution cannot be generated in the use, replacement and regeneration processes of the catalyst, and compared with a traditional SCR denitration catalyst, the SCR denitration catalyst has the obvious advantage of environmental friendliness.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve-based low-temperature environment-friendly SCR denitrification catalyst. Background technique [0002] In the process of industrial production, the direct utilization and deep processing of coal and petroleum resources, automobile exhaust emissions, catalyst production and preparation will produce a large amount of nitrogen oxides. It is estimated that the global emissions of nitrogen oxides will reach 30 million tons in 2020. These nitrogen oxides can produce low-altitude harmful ozone, photochemical smog, acid rain, smog, damage the high-altitude ozone layer, and produce potentially carcinogenic substances, which will cause great harm to the living environment of humans, animals and plants. In recent years, my country's energy supply is still mainly realized through the direct combustion of coal, so the elimination of pollutants such as nitrogen oxides is urgent. [0003] my country...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J37/02B01J35/10B01D53/60B01D53/86
CPCY02A50/20
Inventor 周立坤胡明明苏少龙陈爱民滕厚开
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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