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Titanium and molybdenum compound powder for low-temperature SCR (Selective Catalytic Reduction) denitration and preparation method thereof

A composite powder and denitrification technology, applied in the field of denitrification catalysts, can solve the problems of unsatisfactory medium and low temperature denitrification rate, complicated process, high cost, etc., and achieve the effect of low cost, uniform particle size distribution and less impurities

Active Publication Date: 2018-06-29
PANZHIHUA ZHENGYUAN TECH
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of TiO2 that is applicable to medium and low temperature SCR denitrification catalyst 2 -MoO 3 Composite powder and its preparation method to overcome the disadvantages of complex process, high cost and unsatisfactory medium and low temperature denitrification rate in the production of medium and low temperature SCR denitrification catalysts in the prior art

Method used

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  • Titanium and molybdenum compound powder for low-temperature SCR (Selective Catalytic Reduction) denitration and preparation method thereof
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  • Titanium and molybdenum compound powder for low-temperature SCR (Selective Catalytic Reduction) denitration and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a method for preparing titanium-molybdenum composite powder for SCR denitrification at medium and low temperatures, the steps are as follows:

[0034] a. The raw material metatitanic acid is beaten and dispersed in deionized water or ultrapure water, and adjusted to a slurry with a mass fraction of 10% to 20% in terms of titanium dioxide;

[0035] b. adding ammonia water to the slurry treated in step a to adjust the pH value to 7.5-9.0;

[0036] c. filtering and dehydrating the slurry obtained after the treatment in step b to obtain block filter cake;

[0037] d. Ammonium heptamolybdate (using MoO 3 Content ≥ 80%) is dissolved in deionized water to obtain ammonium heptamolybdate solution;

[0038] e. the solution obtained in step d is divided into MoO in the final product 3 The ratio of 3% to 10% content is evenly sprayed on the filter cake by spraying, and calcined at 150°C to 520°C for 5h to 8h;

[0039] f. After the calcined kiln...

Embodiment 1

[0054] Weigh 38Kg metatitanic acid (TiO 2 Content 26.3%), after classifying by swirl, add it to the reactor with stirring device, add a certain amount of deionized water, adjust the slurry concentration to 15wt% in terms of titanium dioxide; after stirring evenly, add ammonia water to the slurry to adjust the pH value To 8.2; press filtration obtains titanium dioxide massfraction after fully stirring and is the massive metatitanic acid filter cake of 47.84%; With 720g ammonium heptamolybdate (as MoO 3 82% total content) dissolved in 2400ml of water, stirred evenly and evenly sprayed on the above-mentioned metatitanic acid filter cake by spraying method; enter the rotary kiln for calcination, calcination at 250°C for 2h, calcination at 350°C for 1.5h, and calcination at 420°C for 1h , calcined at 485°C for 1 h; the calcined kiln material obtained by calcination was crushed with a pulverizer to prepare TiO 2 -MoO 3 Composite powder products.

Embodiment 2

[0056] Take by weighing 38.3Kg metatitanic acid (TiO 2 Content 26.1%), after classifying by swirl, add it to the reactor with stirring device, add a certain amount of deionized water, adjust the concentration of the slurry to 14wt% in terms of titanium dioxide; after stirring evenly, add ammonia water to the slurry to adjust the pH value to 8.8; after fully stirring and filtering, the filter material obtained by filtering is block metatitanic acid, and the mass fraction of titanium dioxide in the filter cake is 48.13%; Spray evenly on the filter cake; enter the rotary kiln for calcination, calcine at 250°C for 2 hours, calcine at 350°C for 1.5h, calcine at 420°C for 1 hour, and calcine at 485°C for 1 hour; grind the calcined kiln material obtained by calcination with a pulverizer to prepare a powder TiO 2 -MoO 3 Composite powder products.

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Abstract

The invention relates to titanium and molybdenum compound powder for low-temperature SCR (Selective Catalytic Reduction) denitration and a preparation method thereof, and belongs to the field of denitration catalysts. The technical problems to be solved are that a low-temperature SCR denitration catalyst in production is complicated in processes and high in cost. The invention discloses the titanium and molybdenum compound powder applicable to 180 to 400 DEG C of low and medium temperature SCR denitration catalysts. The titanium and molybdenum compound powder is prepared from the chemical components in percentage by mass: 85 to 95 percent of TiO2, 3.0 to 10.0 percent of MoO3, the specific surface area is 80 to 120 m<2> / g, the crystal size is 12.0 to 16.5nm, and the particle size distribution D50 is 0.8 to 1.1 microns and D90 is 2.0 to 3.5 microns. The TiO2-MoO3 compound powder prepared by the preparation method disclosed by the invention is applied to raw material manufacturers of denitration catalysts, and the catalyst prepared by the compound powder has the advantages of medium and low temperature catalytic efficiency, higher mechanical strength, scouring resistant strength and large void volume.

Description

technical field [0001] The invention belongs to the field of denitration catalysts, and in particular relates to a titanium-molybdenum composite powder for medium and low temperature SCR denitration and a preparation method thereof. Background technique [0002] With the development of the economy, the environmental pollution caused by energy consumption is becoming more and more serious. Among them, atmospheric smoke and dust, acid rain, greenhouse effect and destruction of the ozone layer have become the four major killers that endanger people's survival. The main source of air pollution, acid rain and greenhouse effect caused by harmful substances such as soot, sulfur dioxide, and nitrogen oxides contained in coal-burning flue gas. Harmful substances such as sulfur dioxide and nitrogen oxides in my country are mainly produced by the coal-burning process of boilers and automobile exhaust. Therefore, the development of denitrification technology is becoming increasingly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J35/10B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J27/053B01D2251/2062B01J35/40B01J35/613
Inventor 杜广平李洪智黄仁东秦永强
Owner PANZHIHUA ZHENGYUAN TECH
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