Fume denitration composite catalyst using titanium-base ceramics as carrier and preparation method thereof

A monolithic catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of easy pulverization and poor wear resistance of catalysts, Achieve the effect of low cost, good thermal stability and good dispersion

Inactive Publication Date: 2009-02-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the catalyst is easy to pulverize and has poor wear resistance

Method used

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  • Fume denitration composite catalyst using titanium-base ceramics as carrier and preparation method thereof
  • Fume denitration composite catalyst using titanium-base ceramics as carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) SiO 2 Sol preparation

[0028] Measure 100ml TEOS, 30ml ethanol and 80ml water with a graduated cylinder and put them into a round bottom flask, then add glacial acetic acid catalyst at 0.085 times the amount of TEOS substance, stir evenly with a glass rod, and put it into an electronic constant temperature water bath. Condensate and reflux at a constant temperature of 70°C for 50 minutes to obtain stable SiO 2 Sol.

[0029] (2) SiO 2 Application of the second carrier layer

[0030] Immerse 8g of the pretreated silica porcelain in the SiO prepared in step (1) 2 Put it in the sol for 30 minutes, take it out and dry it in the shade for 24 hours, then bake it in a muffle furnace at 500°C for 2 hours, repeat dipping, drying and roasting (drying and roasting system remains unchanged) once until the required carrier load is reached, that is, the coating is complete SiO 2 The second carrier layer, based on the mass of the first carrier, has a mass percentage of 8%; ...

Embodiment 2

[0037] (1) SiO 2 Sol preparation

[0038] Measure 100ml TEOS, 24ml ethanol and 84ml water into a round bottom flask with a graduated cylinder, then add nitric acid catalyst at 0.08 times the amount of TEOS, stir evenly with a glass rod, and put it into an electronic constant temperature water bath. Condensate and reflux at a constant temperature of 65°C for 50 minutes to obtain stable SiO 2 Sol.

[0039] (2) SiO 2 Application of the second carrier layer

[0040] 8g pretreated ATS ceramics were impregnated in the SiO prepared in step (1) 2 Put in the sol for 15 minutes, take it out and dry it in a blast drying oven at 80°C for 10 hours, then bake it in a muffle furnace at 450°C for 2 hours, and then coat SiO 2 The second carrier layer, based on the mass of the first carrier, has a mass percentage of 5.1%;

[0041] (3) Preparation of active component impregnation solution

[0042] 10g Ce(NO 3 ) 3 .6H 2 Ce(NO 3 ) 3 solution;

[0043] (4) Active CeO 2 load

[0044] ...

Embodiment 3

[0046] (1) SiO 2 Sol preparation

[0047] Measure 100ml TEOS, 33ml ethanol and 63ml water into a round bottom flask with a graduated cylinder, then add sulfuric acid catalyst at 0.08 times the amount of TEOS, stir evenly with a glass rod, and put it into an electronic constant temperature water bath. Condensate and reflux at a constant temperature of 75°C for 50 minutes to obtain stable SiO 2 Sol.

[0048] (2) SiO 2 Application of the second carrier layer

[0049] Immerse 8g of the pretreated cordierite porcelain in the SiO prepared in step (1) 2 Put it in the sol for 20 minutes, take it out and dry it in a blast drying oven at 100°C for 9 hours, then heat it in a muffle furnace at 350°C for 3 hours and bake it, repeat dipping, drying and roasting (the drying and roasting system remains unchanged) once until the required carrier is reached loading, i.e. coated SiO 2 The second carrier layer, based on the mass of the first carrier, has a mass percentage of 9.4%;

[0050]...

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Abstract

The invention relates to a monolithic flue gas denitration catalyst with silicon-based ceramic as a carrier and a preparation method thereof, which pertains to the fields of atmospheric pollution treatment technology and pollution-free catalyst materials. The monolithic flue gas denitration catalyst is characterized in that the silicon-based ceramic is taken as a first carrier, active silicon dioxide is taken as a second carrier, a proper amount of one or a plurality of transition metal oxides of Mo, W, Cu, Fe, Zr, La, and the like, is added to CeO2 as the active components. The preparation method adopted is as follows: the silicon-based ceramic is immersed into alumina sol, dried and baked to prepare an active silicon dioxide coating, and then immersed into Ce(NO3)3 solution to prepare an active CeO2 coating. Compared with the prior art, the preparation method of the invention not only improves the mechanical and heat stability of the catalyst carrier, and reduces the load of the active components, but also protects the environment without secondary pollution, enhances the activity of the catalyst, and increases the activity temperature window.

Description

technical field [0001] The invention relates to an environmentally friendly, efficient and cheap flue gas denitrification monolithic catalyst and a preparation method thereof, belonging to the fields of air pollution control technology and environmentally friendly catalytic materials. Background technique [0002] Among the numerous flue gas denitrification methods, selective catalytic reduction (SCR) denitrification technology has been widely used because of its high denitrification efficiency. At present, the SCR denitrification equipment of large and medium-sized thermal power plants in my country is all imported, and the price is very expensive (the denitrification catalyst for a 600MW unit costs about 40 million and needs to be replaced every two years). Flue gas denitrification catalysts without independent intellectual property rights have become my country's environmental protection The "coreless pain" in the field. Commercial SCR denitration catalysts are mainly V ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/16B01J23/83B01D53/56
Inventor 祝社民沈岳松余勇丘泰
Owner NANJING UNIV OF TECH
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