Catalyst for simultaneously removing nitrogen oxides and carbon monoxide as well as preparation method and application of catalyst

A technology of nitrogen oxides and carbon monoxide, applied in chemical instruments and methods, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of little research and development progress, high conversion temperature window, and no breakthrough in lean oxygen concentration, etc., to achieve cost Inexpensive, simple preparation process, high-efficiency medium-temperature SCR denitrification activity and CO removal activity

Pending Publication Date: 2022-03-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conversion temperature window in the method is higher than 450°C, and the oxygen content is less than 2.5%. It is difficult for general industrial flue gas to meet its application conditions, and the NO x Conversion rate is only around 30%
Currently, researchers are working on the removal of NO x A lot of research has been done on the catalyst of CO and CO, but the limit of oxygen-depleted concentration has not been broken through.
[0005] For NH under oxygen-enriched conditions 3 -SCR method to remove NO x There are few reports on the simultaneous removal of CO. Currently, NO x The simultaneous removal of CO and CO is still one of the focuses of researchers. Although the research has achieved some remarkable results, the research and development under the oxygen-enriched conditions of industrial flue gas has not made much progress, and it is still urgent to develop a suitable NO in industrial flue gas x Efficient catalyst for simultaneous removal of CO

Method used

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  • Catalyst for simultaneously removing nitrogen oxides and carbon monoxide as well as preparation method and application of catalyst
  • Catalyst for simultaneously removing nitrogen oxides and carbon monoxide as well as preparation method and application of catalyst
  • Catalyst for simultaneously removing nitrogen oxides and carbon monoxide as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment provides a method for preparing a catalyst for simultaneously removing nitrogen oxides and carbon monoxide, the preparation method comprising the following steps:

[0064] (1) Dilute 4.3mL of concentrated hydrochloric acid to 500mL to obtain a 0.1M dilute hydrochloric acid solution, and dilute 10g of NH 3 - The ZSM-5 carrier was impregnated in 100g of dilute hydrochloric acid solution, stirred at 60°C for 4 days, the diluted hydrochloric acid solution was replaced every 24 hours, dried at 110°C for 24 hours after centrifugation, and the H-ZSM-5 carrier was obtained;

[0065] (2) 3.037g copper nitrate pentahydrate and 4.534g manganese nitrate were dissolved in 100mL deionized water to obtain a mixed solution;

[0066] (3) Immerse the H-ZSM-5 carrier obtained in step (1) in the mixed solution described in step (2), stir at 50°C for 5h, spin-dry at 110°C for 10h, then dry in an oven for 5h, then dry at 500°C The catalyst was calcined at °C for 4 hours with...

Embodiment 2

[0068] This embodiment provides a method for preparing a catalyst for simultaneously removing nitrogen oxides and carbon monoxide, the preparation method comprising the following steps:

[0069] (1) Dilute 2.72mL of concentrated sulfuric acid to 500mL to obtain a 0.1M dilute sulfuric acid solution. Dilute 10g of P25 TiO 2 The carrier was impregnated in dilute sulfuric acid solution, stirred at 80°C for 5 days, replaced every 24h with dilute sulfuric acid solution, centrifuged and dried at 100°C for 24h to obtain TiO 2 -S carrier;

[0070] (2) 1.519g copper nitrate pentahydrate, 2.267g manganese nitrate, 0.386g ammonium metavanadate and 0.831g oxalic acid were dissolved in 100mL deionized water to obtain a mixed solution;

[0071] (3) TiO obtained in step (1) 2 - Immerse the S carrier in the mixed solution described in step (2), stir at 80°C for 3h, spin-dry at 120°C for 5h, then oven-dry for 5h, and then bake at 400°C for 3h with a heating rate of 3°C / min, The catalyst is o...

Embodiment 3

[0073] This embodiment provides a method for preparing a catalyst for simultaneously removing nitrogen oxides and carbon monoxide, the preparation method comprising the following steps:

[0074] (1) Dilute 6.45mL of concentrated hydrochloric acid to 500mL to obtain a 0.15M dilute hydrochloric acid solution, and dilute 10g of NH 3 - The ZSM-5 carrier was impregnated in 100g of dilute hydrochloric acid solution, stirred at 40°C for 7 days, the diluted hydrochloric acid solution was replaced every 30 hours, and dried at 120°C for 12 hours after centrifugation to obtain the H-ZSM-5 carrier;

[0075] (2) 2.416g copper nitrate pentahydrate and 3.380g manganese sulfate are dissolved in 100m deionized water to obtain a mixed solution;

[0076] (3) Immerse the H-ZSM-5 carrier obtained in step (1) in the mixed solution described in step (2), stir at 25°C for 10h, spin-dry at 100°C for 10h, then dry in an oven for 10h, and then dry at 600°C The catalyst was calcined at ℃ for 2 hours wit...

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Abstract

The invention relates to a catalyst for simultaneously removing nitrogen oxide and carbon monoxide and a preparation method and application thereof, the catalyst takes an acid-modified microporous or mesoporous material as a carrier, and the carrier is loaded with an active component; the active component comprises any one or a combination of at least two of oxides of copper, manganese, vanadium, cerium, niobium, cobalt or iron. The catalyst has efficient medium-temperature SCR denitration activity and CO removal activity at the temperature of 150-300 DEG C, and the denitration and CO removal efficiency is higher than 90%; the catalyst system is environment-friendly in components, is suitable for most NH3-SCR systems, does not need to replace a reducing agent, and is not limited by the use of oxygen-deficient conditions in actual flue gas; the catalyst is simple in preparation process, low in cost and suitable for simultaneous removal of NOx and CO in most industrial flue gas.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for simultaneously removing nitrogen oxides and carbon monoxide, a preparation method and application thereof. Background technique [0002] In recent years, particulate matter, SO 2 , NO x The emission of pollutants such as CO and CO has become a growing concern around the world. Among them, SO 2 and particulate matter control technology has become increasingly mature, reducing NO x and CO emissions are key to improving air quality. [0003] Selective catalytic reduction of ammonia (NH 3 -SCR) method is currently the most effective denitrification technology widely used. In the oxygen-poor environment of motor vehicle exhaust, CO can be used as a reducing agent to catalytically reduce NO x , namely CO-SCR technology. Disclosed in CN1102453C is a preparation method of a catalyst for removing nitrogen oxides and carbon monoxide in flue gas. In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J27/02B01D53/86B01D53/56B01D53/62
CPCB01J29/48B01J27/02B01D53/8628B01D53/864Y02A50/20
Inventor 朱廷钰郭旸旸郑扬
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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