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Flue gas denitrification catalyst as well as preparation method and application thereof

A denitration catalyst, flue gas technology, applied in molecular sieve catalysts, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of high denitration temperature, low activity, high toxicity, etc. The effect of active temperature and good denitration effect

Inactive Publication Date: 2019-01-04
大连中威海跃科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this catalyst has the following problems: V 2 o 5 It is highly toxic, has a narrow active temperature window (about 310-410°C), and is susceptible to SO 2 Poisoning, low activity at low temperature, etc.
However, this catalyst uses highly toxic vanadium oxide and does not disclose SO 2 Conversion rate
[0006] CN105817223A discloses a manganese-based low-temperature SCR denitration catalyst, which maintains a good nitrogen oxide removal rate and water and sulfur resistance between 120-250 ° C, but it does not disclose SO 2 Conversion rate
[0007] CN103055848A discloses a low-temperature denitration catalyst doped with rare earth, which uses manganese oxide as the main active component, titanium dioxide as the carrier, and metal oxides such as iron and cerium as catalyst additives. The purification rate is maintained at 80-98%, but it does not examine the anti-poisoning ability of the catalyst and the SO 2 Conversion rate
However, its denitrification temperature is still high, and the specific SO 2 Conversion rate

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  • Flue gas denitrification catalyst as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0040]

[0041] The present invention also provides a method for preparing a flue gas denitrification catalyst, which includes: (1) the preparation step of the precursor solution; (2) the carrier impregnation step; (3) the first roasting step; and (4) the molding and the second Roasting step.

[0042] (1) Preparation steps of precursor solution

[0043] In this step, the active component precursor and the auxiliary agent precursor are dissolved in a solvent to obtain a precursor solution.

[0044] Specifically, take the precursor cerium salt and lanthanum salt of the active component, and take the precursor manganese salt, nickel salt and magnesium salt of the auxiliary agent at the same time, dissolve them in a solvent to make a solution, and then use ammonia water to adjust the pH value to 5-7, preferably 6-7, so as to obtain a solution including active component precursors and auxiliary agent precursors.

[0045] As the above-mentioned solvent, deionized water, a water...

Embodiment 1

[0058] Catalyst preparation

[0059] The specific operation steps are as follows:

[0060] (1) 132g of cerium nitrate hexahydrate, 27g of lanthanum nitrate hexahydrate, 159g of manganese nitrate, 22g of nickel nitrate and 254g of magnesium chloride hexahydrate were dissolved in 392g of deionized water.

[0061] (2) Add ammonia water to the solution to adjust the pH to 6, add the solution to 1000 g of titanium dioxide, stir evenly and then soak for 24 hours.

[0062] (3) Calcining the dried solid at 500° C. for 6 hours.

[0063] (4) Extrude the calcined powder and calcined at 650° C. for 8 hours to obtain the desired catalyst I.

[0064] Performance Testing

[0065] I. Denitrification Efficiency Test

[0066] The catalyst is loaded into a tube furnace, and the catalyst is heated to 120-300°C, wherein the temperature is controlled by a tube resistance furnace. Introduce the flue gas to be treated, the flue gas is a pre-prepared high-purity mixed gas, supplied by the cor...

Embodiment 2

[0071] (1) 106g of cerium nitrate hexahydrate, 54g of lanthanum nitrate hexahydrate, 114g of manganese nitrate, 66g of nickel nitrate and 254g of magnesium chloride hexahydrate were dissolved in 428g of deionized water.

[0072] (2) Add ammonia water to the solution to adjust the pH to 7, add the solution to 1000 g of alumina, stir evenly and then soak for 24 hours.

[0073] (3) Calcining the dried solid at 500° C. for 6 hours.

[0074] (4) The calcined powder is extruded and calcined at 650° C. for 8 hours to obtain the desired catalyst II.

[0075] Carry out the same denitrification efficiency, anti-sulfur and water resistance and SO 2 Conversion test. The results show that under the above test conditions, the catalyst can maintain good denitrification activity and anti-sulfur and water resistance in the temperature range of 120-300 °C, and the removal rate of nitrogen oxides is always higher than 90%. The temperature range is higher than 95%.

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Abstract

The invention relates to a flue gas denitrification catalyst as well as a preparation method and application thereof. The flue gas denitrification catalyst comprises a carrier, an active component andan auxiliary; the active component contains oxides of cerium and lanthanum; the auxiliary contains transition metal oxide and alkaline earth metal oxide; compared with the mass of the carrier, the total content of the oxides of the cerium and the lanthanum is 1-10 percent by mass. The flue gas denitrification catalyst provided by the invention is a denitrification catalyst with low temperature, high efficiency, wide temperature window, safety and environmental protection, resistance to poisoning and low conversion rate from SO2 to SO3. The preparation method provided by the invention is simple in process, lower in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a flue gas denitrification catalyst, a preparation method and application thereof. Background technique [0002] As we all know, our air pollution has been very serious in recent years. Nitrogen oxides (NO x , which includes NO, NO 2 , N 2 O, etc.) emissions are one of the main pollutants of air pollution, they will seriously endanger human health. Nitrogen oxides mainly come from fuel combustion in industrial production and transportation fuel combustion, so the research on flue gas denitrification technology is of great significance. [0003] Selective Catalytic Reduction (Selective Catalytic Reduction, SCR) denitration efficiency is high and the technology is mature, which is currently the most widely used technology. However, the catalyst used is generally V 2 o 5 As an active component, TiO 2 Vanadium-titanium catalyst as a carrier. However, this catalyst has the following problems: V 2 o 5 It is highly toxic, h...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J29/48B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/83B01J29/48B01J2229/18B01J2523/00B01J2523/22B01J2523/3706B01J2523/3712B01J2523/72B01J2523/847
Inventor 李丽萍陈帅
Owner 大连中威海跃科技有限公司