Cordierite-base copper oxide/ gamma-aluminium oxide catalyst used for flue gas denitration and preparation method and application

A cordierite and catalyst technology, applied in the field of cordierite-based CuO/γ-Al2O3 catalysts, can solve the problems of repeated impregnation, low loading capacity, no enhanced carrier and coating firmness, etc., to reduce coating cracks and improve Denitrification activity, effect of increasing firmness

Inactive Publication Date: 2007-10-17
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
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AI Technical Summary

Problems solved by technology

Catalysis Today (2004, 93-95: 833-837) reported that the catalyst prepared by coating the honeycomb cordierite with alumina and the active component CuO by the sol-gel method has good NO x However, the cordierite prepared by this method has the following problems in the process of coating alumina: (1) the loading capacity at one time is low, and repeated impregnation is required; (2) the coating process is not easy to control, and the alumina coating film is easy to appear crack
[0003] JP59039346 is also on Al 2 o 3 The coating method was reported. This method is to pre-coat cordierite with an aqueous solution of organic polymers such as polyvinyl alcohol, polyethylene, polypropylene, polystyrene, and polyurethane, and then coat Al 2 o 3 sol, but this method does not enhance the firmness between the carrier and the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 16g of Al powder, 48g of aluminum chloride hexahydrate, and 200mL of distilled water into a three-neck flask, reflux in a water bath at 80°C for 48 hours, and then filter under reduced pressure to obtain a stable and transparent Al 2 o 3 Sol. After immersing the cordierite honeycomb ceramics for 6 hours, take them out, blow off the excess sol in the channels, place them at room temperature for 12 hours, then dry them at 60°C for 12 hours, and calcinate them at 500°C for 8 hours, Al 2 o 3 5% of uploads. Configure 1.0wt.% Cu(NO 3 ) 3 solution, will be loaded with Al 2 o 3 The coated cordierite support was impregnated into Cu(NO 3 ) 3 3h in solution, 24h at room temperature, 8h at 60°C drying, and 6h calcination at 400°C to obtain a CuO loading of 1.2%, Al 2 o 3 Catalyst with 5% cordierite content and 93.8% cordierite content. The simulated flue gas composition is 1600ppm SO 2 , 600ppm NO, 600ppmNH 3 , 5.0%O 2 , 2.5%H 2 O, N 2 For balance. Control the ...

Embodiment 2

[0021] Add 21g of Al powder, 48g of aluminum chloride hexahydrate and 200mL of distilled water into a three-neck flask, reflux in a water bath at 90°C for 24 hours, and then filter under reduced pressure to obtain a stable and transparent Al 2 o 3 Sol. Immerse the cordierite honeycomb ceramics for 6 hours, take them out, blow off the excess sol in the channels, place them at room temperature for 18 hours, then dry them at 90°C for 10 hours, and calcinate them at 500°C for 8, Al 2 o 3 uploads at 7%. Configure 1.5wt.% Cu(NO 3 ) 3 solution, will be loaded with Al 2 o 3 The coated cordierite support was impregnated into Cu(NO 3 ) 3 6h in solution, 12h at room temperature, 10h under drying at 90°C, and then calcined at 400°C for 8h to obtain a loading of CuO of 3%, Al 2 o 3 Catalyst with 7% cordierite content and 90% cordierite content. The simulated flue gas composition is 1600ppm SO 2 , 600ppm NO, 600ppmNH 3 , 5.0%O 2 , 2.5%H 2 O, N 2 For balance. Control the rea...

Embodiment 3

[0023] Add 27g of Al powder, 48g of aluminum chloride hexahydrate and 200mL of distilled water into a three-neck flask, reflux in a water bath at 95°C for 12 hours, and then filter under reduced pressure to obtain a stable and transparent Al 2 o 3 Sol. After immersing the cordierite honeycomb ceramics for 6 hours, take them out, blow off the excess sol in the channels, place them at room temperature for 24 hours, then dry them at 110°C for 8 hours, and then calcinate them at 400°C for 8 hours. 2 o 3 10% of uploads. Configure 2.0wt.% Cu(NO 3 ) 3 solution, will be loaded with Al 2 o 3 The coated cordierite support was impregnated into Cu(NO 3 ) 3 9h in solution, 24h at room temperature, 12h under drying at 110°C, and calcination at 500°C for 10h to obtain a loading of CuO of 5.3%, Al 2 o 3 A catalyst with a content of 10% and a cordierite content of 84.7%. The simulated flue gas composition is 1600ppm SO 2 , 600ppm NO, 600ppmNH 3 , 5.0%O 2 , 2.5%H 2 O, N 2 For ba...

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PUM

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Abstract

Weight percent ratio of a flue gas Cuo/gamma-Al2O3 catalyst based on cordierite is in that: cordierite carrier is 78.7-93.8%, Al2O3 is 5-16% and CuO is 1.2-5.3%. Cordierite honeycomb ceramic with high intensity is adopted as a substrate, which is impregnated with CuO of a certain concentration after coated with the carrier gamma-Al2O3. The invention can reduce coating crack of the gamma-Al2O3 film and increase firmness of the gamma-Al2O3 coating and uploading capacity of the gamma-Al2O3 by using a simple and effective coating method, and has advantages of enhanced denitrification activity, life and stability of the catalyst.

Description

technical field [0001] The invention relates to a cordierite-based CuO / γ-Al for medium and high temperature flue gas denitrification 2 o 3 Catalyst and its preparation method and application Background technique [0002] Coal is the main energy source in my country. In recent years, with the development of my country's economy, the demand for coal is also increasing. The SO emitted after combustion 2 and NO x (nitrate) total amount is also increasing, has a strong impact on the ecological environment, human health and sustainable economic development. For the existing domestic situation, SO 2 The pollution control of China already has relatively mature wet technology, while the pollution control of NOx has just started and there is no mature technology. The existing foreign mature denitrification technology adopts V 2 o 5 / TiO 2 As a catalyst, the cost is higher. Therefore, it is imperative to develop cost-effective NOx control technology. Selective Catalytic Reduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/835B01D53/54
Inventor 刘振宇苏军划黄张根赵有华
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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