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Denitration catalyst, and preparation method and application thereof

A denitration catalyst and denitration technology, applied in the field of denitration catalysts, can solve the problems of high reaction temperature, easy to cause toxicity, environmental pollution in the preparation process, etc.

Active Publication Date: 2020-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The above-mentioned patents all use red mud as the main carrier, and after acid-base washing or water washing, modification, and activation, red mud-based denitrification catalysts are prepared. surroundings
In addition, due to the toxicity of vanadium oxide, vanadium-free denitrification agents need further research

Method used

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  • Denitration catalyst, and preparation method and application thereof
  • Denitration catalyst, and preparation method and application thereof
  • Denitration catalyst, and preparation method and application thereof

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preparation example Construction

[0029] In some optional embodiments, the preparation method includes: according to the above parts by weight, the product obtained by mixing all the components is dried, roasted, cooled to room temperature, ground and sieved.

[0030] Preferably, the method includes allowing the mixture of all components to stand still for 6-12 hours, and then drying the block or ball through an extruder or a special mold.

[0031] Preferably, the prepared block or sphere is uniform in size, and its side length or diameter is not more than 0.5 cm, so as to avoid the uneven distribution of internal pores caused by the uneven heating of the catalyst in the subsequent drying and roasting process, thereby reducing the activity of the catalyst .

[0032] Preferably, the drying condition is 90-150° C. for 2-6 hours.

[0033] Preferably, the calcination condition is 300-600° C. for 2-5 hours.

[0034] Preferably, after grinding, pass through a 40-80 mesh sieve, that is, grind to 0.2mm-0.425mm.

[...

Embodiment 1

[0046] This embodiment provides a method for preparing a denitration catalyst, which includes the following steps.

[0047] (1) Raw material components:

[0048] 65.0g red mud, 27.0g CFB coal-fired boiler fly ash, 5.2g general formula CeMn 0.8 co 0.2 o 3 perovskite composite metal oxide and 2.8g pore expander.

[0049] (2) Preparation:

[0050] Prepare according to the above parts by weight. First, the red mud and fly ash are crushed separately, dried to constant weight, and mechanically stirred until uniformly mixed to obtain a mixture of red mud and fly ash.

[0051] Put the perovskite-type composite metal oxide in a beaker, add 300mL of distilled water, heat and stir in a water bath at 35°C for 120 minutes, then slowly add the mixture of red mud and fly ash into the beaker, and continue heating and stirring in the water bath after the addition is complete 15min. After stirring, add the pore-enlarging agent into the beaker. After the addition, continue heating and sti...

Embodiment 2

[0054] This embodiment provides a method for preparing a denitration catalyst, which includes the following steps.

[0055] (1) Raw material components:

[0056] 62.0g red mud, 21.0g CFB coal-fired boiler fly ash, 13.5g general formula CeMn 0.5 co 0.5 o 3 perovskite composite metal oxide and 3.5g pore expander.

[0057] (2) Preparation:

[0058] Prepare according to the above parts by weight. First, the red mud and fly ash are crushed separately, dried to constant weight, and mechanically stirred until uniformly mixed to obtain a mixture of red mud and fly ash.

[0059] Put the perovskite-type composite metal oxide in a beaker, add 300mL of distilled water, heat and stir in a water bath at 50°C for 85 minutes, then slowly add the mixture of red mud and fly ash into the beaker, and continue heating and stirring in the water bath after the addition is complete 15min. After stirring, add the pore-enlarging agent into the beaker. After the addition, continue heating and sti...

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Abstract

The invention discloses a denitration catalyst, and a preparation method and application thereof, and relates to the technical field of denitration catalysts. The denitration catalyst is a low-temperature SCR denitration catalyst taking red mud as a main raw material. The denitration catalyst is prepared through roasting 45-80 parts of red mud, 10-40 parts of fly ash, 3-25 parts of perovskite typecomposite metal oxide and 0.5-5 parts of pore-enlarging agent. The reaction temperature required by the denitration catalyst is relatively low, and the denitration catalyst has good low-temperature catalytic activity. Besides, the denitration catalyst is large in specific surface area, developed in void structure and good in sulfur resistance, and the production cost of the denitration catalyst is reduced under the condition that the red mud is effectively recycled.

Description

technical field [0001] The invention relates to the technical field of denitration catalysts, in particular to a denitration catalyst and its preparation method and application. Background technique [0002] Nitrogen oxides (NO X ) is one of the main pollutants in the atmosphere. It has a long life cycle in the air and a long transmission distance. It can cause weather phenomena such as smog, acid rain, and photochemical smog. Facing the ever-increasing pressure to reduce emissions, the development of flue gas denitrification technology has always been a hot research topic in the field of atmospheric governance. Selective Catalytic Reduction (SCR) denitrification technology has gradually developed since it came out in 1957. With its low reaction temperature, high NOx removal efficiency, and low secondary pollution, it has become the most widely used and most advanced technology in the world. An effective flue gas denitrification technology. At present, most common SCR cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10B01J37/00B01J37/08B01D53/86B01D53/56
CPCB01J23/8892B01J23/002B01J37/0018B01J37/0036B01D53/8628B01D2258/0283B01J2523/00B01J35/615B01J2523/31B01J2523/3712B01J2523/41B01J2523/47B01J2523/72B01J2523/842B01J2523/845Y02C20/10
Inventor 陈千惠齐文义李小苗黄延召孟学峰邓向军
Owner CHINA PETROLEUM & CHEM CORP
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