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Integral denitration catalyst using double-oxide as composite carrier and its prepn. method

A denitrification catalyst and composite carrier technology, which is applied in the field of nitrogen oxide reduction catalyst preparation, can solve the problems of affecting the life of the catalyst and the stability cannot be guaranteed, and achieve improved surface structure and mechanical stability, low cost, and wide sources Effect

Inactive Publication Date: 2006-06-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the vanadium-based catalyst supported by activated carbon has good low-temperature activity, the stability of the activated carbon support cannot be guaranteed under the conditions of rich oxygen and high space velocity, which seriously affects the life of the catalyst; 2 o 5 load on Al 2 o 3 On the carrier, the results of the powder sample proved that its activity is much lower than that of TiO 2 Supported vanadium-based catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1)Al 2 o 3 Preparation of slurry

[0038] Weigh 16g of pseudo-boehmite, add 2g of urea, dissolve with 40ml of 0.3M nitric acid solution, stir evenly, add to a ball mill, and grind for 3 hours to obtain Al 2 o 3 slurry;

[0039] (2)Al 2 o 3 Coating of inner carrier

[0040] Impregnate the cordierite honeycomb ceramic carrier in the Al prepared in step (2) 2 o 3 In the slurry, take it out after soaking for 2 minutes, blow off the residual liquid in the channel, dry in the air at 110°C for 2 hours, and bake at 550°C for 5 hours in the air;

[0041] (3) TiO 2 Sol preparation

[0042] Dissolve 25ml of tetrabutyl titanate in 15ml of absolute ethanol, stir for 10 minutes, add 0.25ml of concentrated nitric acid, and stir for 30 minutes to obtain solution A; add 3ml of deionized water to 10ml of absolute ethanol to obtain solution B; stir Slowly add solution B to solution A, stir vigorously for 40 minutes, and when the solution is hydrolyzed into a transparent sol, T...

Embodiment 2

[0051] (1)Al 2 o 3 Preparation of slurry

[0052] Weigh 12g of pseudo-boehmite, add 6g of urea, dissolve with 40ml of 0.4M nitric acid solution, stir evenly, add to a ball mill, and grind for 3 hours to obtain Al 2 o 3 slurry;

[0053] (2)Al 2 o 3 Coating of inner carrier

[0054] Impregnate the cordierite honeycomb ceramic carrier in the Al prepared in step (2) 2 o 3 In the slurry, take it out after soaking for 2 minutes, blow off the residual liquid in the channel, dry in the air at 120°C for 1.5 hours, and bake at 650°C for 3 hours;

[0055] (3) TiO 2 Sol preparation

[0056] Dissolve 12.5ml of tetrabutyl titanate in 33.3ml of absolute ethanol, stir for 10 minutes, add 0.25ml of concentrated nitric acid, and stir for 30 minutes to obtain solution A; add 1.5ml of deionized water to 16.7ml of absolute ethanol to obtain Solution B: Slowly add solution B to solution A while stirring, and stir vigorously for 40 minutes. When the solution is hydrolyzed into a transpare...

Embodiment 3

[0065] (1)Al 2 o 3 Preparation of slurry

[0066] Weigh 16g of pseudo-boehmite, add 8g of urea, dissolve with 40ml of 0.3M nitric acid solution, stir evenly, add to a ball mill, and grind for 3 hours to obtain Al 2 o 3 slurry;

[0067] (2)Al 2 o 3 Coating of inner carrier

[0068] Impregnate the cordierite honeycomb ceramic carrier in the Al prepared in step (2) 2 o 3 In the slurry, take it out after soaking for 2 minutes, blow off the residual liquid in the channel, dry in the air at 110°C for 2 hours, and bake at 650°C for 3 hours;

[0069] (3) TiO 2 Sol preparation

[0070] Dissolve 15ml of tetrabutyl titanate in 95ml of absolute ethanol, stir for 10 minutes, add 1.5ml of concentrated nitric acid, and stir for 30 minutes to obtain solution A; add 7.5ml of deionized water to 55ml of absolute ethanol to obtain solution B; Slowly add solution B to solution A while stirring, and stir vigorously for 40 minutes. When the solution is hydrolyzed into a transparent sol, T...

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Abstract

An integral de-nitrating catalyst SCR with dual oxides as carrier for removing NOx from fume is characterized by that the cellular cordierite ceramic is used as skeleton, its composite carrier is composed of Al2O3 as internal layer and TiO2 as external layer, and its active component consists of V2O5 and WO3. Its advantages are high activity, wide active temp window, and high effect and mechanical stability.

Description

technical field [0001] The invention relates to a monolithic denitrification catalyst of a double oxide composite carrier and a preparation method thereof, in particular to a catalyst for efficient catalytic reduction of nitrogen oxides in flue gas at a temperature range of 350-450°C and a preparation method thereof, belonging to The technical field of nitrogen oxide reduction catalyst preparation. Background technique [0002] With the advancement of science and technology, productivity has been greatly improved, but the living environment of human beings has also been greatly damaged, and global environmental problems such as acid rain, photochemical smog, ozone layer destruction and greenhouse effect have become increasingly prominent. The occurrence of these problems is closely related to the hydrocarbons and nitrogen oxides emitted by humans into the atmosphere. According to incomplete estimates, the annual global NOx emitted into the atmosphere due to the burning of f...

Claims

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Application Information

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IPC IPC(8): B01J23/16B01D53/56B01J32/00B01J37/02
Inventor 李俊华陈建军罗传奎郝吉明朱永青
Owner TSINGHUA UNIV
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