Novel composite-carrier honeycomb monolithic denitration catalyst and preparing method thereof

The technology of denitration catalyst and composite carrier is applied in the field of honeycomb monolithic SCR denitration catalyst and preparation, which can solve the problems of high price and unstable mechanical properties, and achieve the effect of low cost of raw materials, lower cost of catalyst and promotion of promotion.

Inactive Publication Date: 2012-11-14
CHONGQING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to overcome the defects of unstable mechanical properties and high price of the existing SCR denitration catalyst carrier, and to provide a denitration catalyst using modified cordierite and titanium dioxide as a composite carrier and its preparation method

Method used

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  • Novel composite-carrier honeycomb monolithic denitration catalyst and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] (1) Weigh 2kg of cordierite powder, soak in 15wt% sulfuric acid solution at room temperature for 6 hours, dry at 50°C for 2 hours, and dry at 110°C for 5 hours to obtain modified cordierite powder for use.

[0022] (2) Take 0.216kg of oxalic acid and 2200mL of water in a large beaker, then weigh 0.216kg of ammonium metavanadate into it, heat at 60°C for 18 minutes to prepare a catalyst active solution for later use.

[0023] (3) Weigh 1.62 kg of modified cordierite powder, 0.162 kg of polyvinyl alcohol, 0.32 kg of glass fiber and 13.682 kg of titanium-tungsten powder and pour them into the mixer for stirring. ammonium vanadate solution and 1500 mL deionized water. Among them, titanium tungsten powder is titanium dioxide, which contains 3~10% WO 3 .

[0024] (4) After being fully stirred, after cooling and adjustment, the material shall be stale for 24 hours and then be extruded;

[0025] (5) Extrude the monolithic honeycomb catalyst from the extruder, dry at 90°C for...

Embodiment 2

[0028] (1) Weigh 3kg of cordierite powder, soak in 25wt% sulfuric acid solution at room temperature for 6 hours, dry at 60°C for 3 hours, and dry at 105°C for 5 hours to obtain modified cordierite powder for use.

[0029] (2) Take 0.268kg of oxalic acid and 2800mL of water in a large beaker, then weigh 0.268kg of ammonium metavanadate into it, heat at 85°C for 10 minutes to prepare a catalyst active solution for later use.

[0030] (3) Weigh 2.42 kg of modified cordierite powder, 0.49 kg of polyvinyl alcohol, 0.81 kg of glass fiber and 12.064 kg of titanium tungsten powder and pour them into the mixer for stirring. ammonium vanadate solution and 1000 mL deionized water. Among them, titanium tungsten powder is titanium dioxide, which contains 3~10% WO 3 .

[0031] (4) After being fully stirred, after cooling and adjustment, the material shall be stale for 24 hours and then be extruded;

[0032] (5) Extrude the monolithic honeycomb catalyst from the extruder, dry at 100°C for...

Embodiment 3

[0035] (1) Weigh 4kg cordierite powder, soak it in 35wt% sulfuric acid solution at room temperature for 7 hours, dry it at 50°C for 2 hours, and dry it at 110°C for 6 hours to obtain modified cordierite powder for use.

[0036](2) Take 0.315 kg of oxalic acid and 3200 mL of water in a large beaker, then weigh 0.315 kg of ammonium metavanadate into it, heat at 75°C for 20 minutes to prepare a catalyst active solution for later use.

[0037] (3) Weigh 3.23 kg of modified cordierite powder, 0.32 kg of polyvinyl alcohol, 0.81 kg of glass fiber and 11.424 kg of titanium-tungsten powder and pour them into the mixer for stirring. ammonium vanadate solution and 800 mL deionized water. Among them, titanium tungsten powder is titanium dioxide, which contains 3~10% WO 3 .

[0038] (4) After being fully stirred, after cooling and adjustment, the material shall be stale for 24 hours and then be extruded;

[0039] (5) Extrude the monolithic honeycomb catalyst from the extruder, dry at 10...

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Abstract

The invention discloses novel composite-carrier honeycomb monolithic denitration catalyst, in particular to honeycomb monolithic SCR (selective catalytic reduction) denitration catalyst with modified cordierite and titanium dioxide as a composite carrier and a preparing method of the honeycomb monolithic SCR denitration catalyst. The novel composite-carrier honeycomb monolithic denitration catalyst includes the following components, 10-25wt% of modified cordierite powder, 65-85wt% of titanium tungsten powder (containing 3-10wt% of WO3), 1-2wt% of V2O5, and the balance additive which is glass fiber or polyvinyl alcohol. The novel composite-carrier honeycomb monolithic denitration catalyst is prepared from following steps of mixing, mud refining, extrusion forming, drying and roasting, has the advantages of chemical stability, thermostability and wear-resisting property, and expresses higher catalytic activity of NH3-SCR and wider active temperature window. Cordierite power at low cost is utilized to substitute part of imported titanium tungsten powder and serve as the carrier for the SCR denitration catalyst which is simple to prepare, degree of dependence on imported titanium tungsten powder is reduced, and the defects that the carrier for existing SCR denitration catalyst is unstable in mechanical performance and high in price are overcome.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a honeycomb monolithic SCR denitration catalyst using modified cordierite and titanium dioxide as a composite carrier and a preparation method thereof. Background technique [0002] Nearly 70% of my country's nitrogen oxide emissions come from the direct combustion of coal, and coal-fired power plants bear the brunt of the contribution to NOx. Controlling NOx emissions from power plants has obvious effects on reducing NOx emissions and improving air quality. major. Currently, Selective Catalytic Reduction (SCR) is the most widely used NOx purification control method in coal-fired power plants. The core of the SCR technology for commercial coal-fired power plants is the denitrification catalyst, whose composition is V 2 o 5 -WO 3 / TiO 2 , the carrier is anatase TiO 2 Powder (titanium dioxide), which also contains 3~10% WO 3 , accounting for 80~90...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/04B01D53/86B01D53/56
Inventor 刘清才贺媛媛吴国防丁健徐晶席文昌杨剑刘浪兰苑培杨强
Owner CHONGQING UNIV
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