Denitration catalyst and preparation method thereof

A denitration catalyst and oxide technology, which is applied in catalyst activation/preparation, chemical instruments and methods, and physical/chemical process catalysts, etc., can solve the problems of high catalyst cost and decrease in denitration activity, and achieve less decrease in denitration activity. The effect of low consumption of raw materials and stable quality

Active Publication Date: 2011-04-06
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the SCR flue gas denitrification catalyst prepared by the existing catalyst preparation technology can obtain high denitrification activity, but because the catalyst precursor liquid is prepared by using the finished raw material corresponding to the active component and then the catalyst is produced by appropriate proportioning, the catalyst At the same time, the existing SCR flue gas denitrification catalyst is sensitive to moisture and sulfur dioxide in the flue gas. When the moisture and sulfur dioxide content are high, the denitrification activity decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The following part of this example describes the preparation of the denitration catalyst:

[0031] 1. Fine grinding of slag

[0032] Put the coal ash into the coal mill and grind it until the particle size is ≤200 μm.

[0033] 2. Acid leaching of slag

[0034] The finely ground lime ash was added to a sulfuric acid solution with a volume concentration of 40% for stirring acid leaching. The acid leaching temperature was 110 °C, the acid leaching time was 3 hours, and the solid-liquid weight ratio was 1:3. After filtration, pickling solution.

[0035] 3. Ammonium alum crystallization

[0036] Add excess (NH 4 ) 2 SO 4 , the dosage is to control Al 3＋ and NH 4 + The molar ratio is 1:5, stirring at a constant speed during the addition process. The solution was cooled to room temperature using tap water for 2 hours. The ammonium alum crystallizes and precipitates, and the crude ammonium alum can be obtained by filtration, and the filtrate is the vanadiu...

Embodiment 2

[0045] Example 2: The following part of this example describes the preparation of the denitration catalyst:

[0046] 1. Fine grinding of slag

[0047] Put the coal ash into the coal mill and grind it until the particle size is ≤200 μm.

[0048] 2. Acid leaching of slag

[0049] Add the finely ground coal ash residue into sulfuric acid with a volume concentration of 50% for stirring acid leaching. The acid leaching temperature is 120 ℃, the acid leaching time is 4 hours, and the solid-liquid weight ratio is 1:4. After filtration, acid leaching is obtained. Dip.

[0050] 3. Ammonium alum crystallization

[0051] Add excess (NH 4 ) 2 SO 4 , the dosage is to control Al 3＋ and NH 4 + The molar ratio is 1:7. Stir at a constant speed during the addition, and cool the solution to room temperature with tap water for 3 hours. The ammonium alum crystallizes and precipitates, and the crude ammonium alum can be obtained by filtration, and the filtrate is the vanadium-containing mo...

Embodiment 3

[0060] Example 3: The following part of this example describes the preparation of the denitration catalyst:

[0061] 1. Fine grinding of slag

[0062] Put the coal ash into the coal mill and grind it until the particle size is ≤200 μm.

[0063] 2. Acid leaching of slag

[0064] The finely ground lime ash was added to a sulfuric acid solution with a volume concentration of 42% for stirring acid leaching. The acid leaching temperature was 100 °C, the acid leaching time was 3 hours, and the solid-liquid weight ratio was 1:3. After filtration, pickling solution.

[0065] 3. Ammonium alum crystallization

[0066] Add excess (NH 4 ) 2 SO 4 , the dosage is to control Al 3＋ and NH 4 + The molar ratio is 1:6, stirring at a constant speed during the addition process. The solution was cooled to room temperature using tap water for 2 hours. The ammonium alum crystallizes and precipitates, and the crude ammonium alum can be obtained by filtration, and the filtrate is the vanadiu...

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PUM

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Abstract

The invention relates to a denitration catalyst and a preparation method thereof, in particular to a flue gas selective catalytic reduction denitration catalyst prepared by utilizing stone coal ash and a preparation method thereof, belonging to the field of environmental-friendly catalytic materials used for air pollution. The denitration catalyst comprises a carrier and an active component, wherein the carrier is anatase type nanometer titanium dioxide; and the active component is a mixed metal oxide of vanadium, aluminum and ferrum. The invention has the advantages of reasonable component design, high active degree, difficult ineffectiveness, low price, stability, reliability, reasonable process design, energy saving, environmental protection, low cost and stable product quality.

Description

technical field [0001] The invention relates to a denitrification catalyst and a preparation method thereof, belonging to the field of environmental protection catalytic materials used in air pollution, in particular to a flue gas selective catalytic reduction denitrification catalyst prepared by using lime ash and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the major air pollutants recognized around the world. It destroys the ozone layer, forms acid rain and photochemical smog, affects the ecological environment, and endangers human health. At present, the reduction of nitrogen oxides has attracted great attention. Selective catalytic reduction (SCR) flue gas denitrification technology is widely used in flue gas denitrification projects at home and abroad because of its good catalytic activity, selectivity and thermal stability, and has also become the first choice for coal-fired flue gas denitrification. mainstream techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J37/02B01D53/86B01D53/56
Inventor 朱跃张扬何胜程雪山
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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