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A kind of low-temperature SCR catalyst and its preparation method and application

An SCR catalyst and a catalyst technology, applied in the field of low-temperature SCR catalyst and its preparation, can solve the problems of unsatisfactory denitration performance, limit the promotion and application of low-temperature SCR catalyst, etc., and achieve remarkable beneficial effects, simple and fast production process, and improved denitration efficiency. Effect

Active Publication Date: 2018-10-16
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-temperature SCR device is generally placed after the desulfurization and dust removal device, SO 2 Low dust concentration and dust concentration are beneficial to improve the service life of the catalyst, but the denitrification performance of the existing catalysts at relatively low temperatures is not ideal, thus limiting the promotion and application of low-temperature SCR catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 0.90g Mn(NO 3 ) 2 and 0.73g Co(NO 3 ) 2 Dissolve in 100 mL of deionized water, add 5g of activated alumina powder, then slowly add concentrated ammonia water dropwise, adjust the pH to 10-11, continue to stir for 2 hours, filter with suction, dry in an oven at 100°C, and then place in a muffle furnace at 400°C Medium roasting for 4h.

[0021] Catalyst evaluation method is the same as comparative example. The test results are shown in Table 1.

Embodiment 2

[0023] 0.73g Co(NO 3 ) 2 changed to 1.01g Fe (NO 3 ) 3 , and all the other preparation methods are the same as in Example 1. Catalyst evaluation method is the same as comparative example. The test results are shown in Table 1.

Embodiment 3

[0025] Change 5g of activated alumina powder into 5g of cordierite powder in Example 1, and the rest of the preparation method is the same as the comparative example. Catalyst evaluation method is the same as comparative example. The test results are shown in Table 1.

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Abstract

The invention discloses a low temperature SCR catalyst and a preparation method thereof; the method is as follows: dissolving manganese nitrate and other nitrates in 100mL deionized water, adding activated alumina powder, then slowly adding concentrated ammonia dropwise, adjusting the pH to 10-11, continuing stirring for 2-6h, filtering by suction, drying in a drying oven at 50-100 DEG C, and then roasting in a muffle furnace at 200-500 DEG C for 2-8h; and the catalyst takes the activated alumina or cordierite powder as a carrier, and an active component is manganese oxide or composite oxides thereof. The catalyst comprises 5% to 15% by mass of the active component and balance of the carrier. The catalyst belongs to an environment-friendly catalyst, the catalyst active window is in the range of 125 to 200 DEG C, the denitration rate reaches 80% above, and the catalyst has long service life.

Description

technical field [0001] The invention relates to a low-temperature SCR catalyst and a preparation method thereof, belonging to the technical field of industrial denitrification. Background technique [0002] Nitrogen oxides are common pollutants discharged into the atmosphere by human activities, of which the largest proportion is NO and NO 2 . The high concentration of NOx in the atmosphere has a strong stimulating effect on the human respiratory system, which can easily cause bronchitis, emphysema and even cancer. At the same time, nitrogen oxides can cause environmental pollution. After being discharged into the atmosphere, they react with oxygen and water to form acid rain and acid fog, and form photochemical smog with hydrocarbons. [0003] The SCR catalytic technology using ammonia etc. as the reducing gas can effectively solve the nitrogen oxide gas emitted by industry. According to the classification of flue gas temperature conditions applicable to catalysts, SCR c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J23/889B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J23/002B01J23/75B01J23/8892B01J2523/00B01J2523/31B01J2523/842B01J2523/845B01J2523/72
Inventor 何丹农高振源杨玲赵昆峰袁静蔡婷张涛金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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