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A kind of denitration catalyst and preparation method thereof

A technology of denitrification catalyst and catalytic aid, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem of small specific surface area of ​​catalysts, so as to avoid damage to human body and environment, improve Effect of specific surface area and pore volume increase

Active Publication Date: 2020-04-17
JIANGSU JINGJING NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these catalysts have the problem of small specific surface area

Method used

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  • A kind of denitration catalyst and preparation method thereof

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preparation example Construction

[0026] The invention provides a preparation method of a denitration catalyst, comprising the following steps:

[0027] 1) mixing the nitric acid solution, the sodium metaaluminate solution and the catalytic promoter to obtain a colloidal solution, the catalytic promoter comprising alkali metal silicate and rare earth metal nitrate;

[0028] 2) aging the colloidal solution to obtain pseudo-boehmite containing a catalytic promoter;

[0029] 3) Kneading the pseudo-boehmite containing the catalytic promoter and the nitric acid solution to obtain a honeycomb carrier;

[0030] 4) drying the honeycomb carrier successively and first roasting to obtain a catalyst carrier;

[0031] 5) impregnating and adsorbing the catalyst carrier in a mixed solution of potassium permanganate, ferric nitrate, calcium nitrate and water to obtain the impregnated catalyst carrier;

[0032] 6) The impregnated catalyst carrier is sequentially dried and secondly calcined to obtain a denitration catalyst. ...

Embodiment 1

[0048] (1) Under mechanical stirring, the nitric acid solution with a mass percentage of 10% and the sodium metaaluminate solution with a concentration of 100 g / L as aluminum oxide are continuously gelled in a synthesis kettle, and the reaction temperature is controlled at 60° C. During the neutralization process, catalyst promoters sodium silicate and lanthanum nitrate are added to obtain a colloidal solution.

[0049] (2) The obtained colloidal solution is all moved into the aging tank, aged at 50°C for 60min, after the aging is completed, filtered, the solid product is taken, washed continuously for 5 times with deionized water to obtain the pseudo-boehmite containing the catalytic promoter ;

[0050] (3) kneading the pseudo-boehmite filter cake and 5% dilute nitric acid in a vacuum mud mill, and then extruding into a honeycomb carrier through a vacuum extruder;

[0051] (4) The extruded honeycomb carrier is dried in a drying room at 100°C for 6h, and roasted in a roasting...

Embodiment 2

[0057] (1) Under mechanical stirring, the nitric acid solution with a mass percentage of 35% and the sodium metaaluminate solution with a concentration of 400 g / L as alumina are continuously gelled in a synthesis kettle, and the reaction temperature is controlled at 90° C. In the process of neutralization, catalyst promoters potassium silicate and cerium nitrate are added to obtain a colloidal solution.

[0058] (2) The obtained colloidal solution is all moved into the aging tank, aged at 75°C for 30min, after the aging is completed, filtered, and the solid product is taken, washed continuously with deionized water for 4 times to obtain pseudo-boehmite containing catalytic promoter ;

[0059] (3) kneading the pseudo-boehmite filter cake and 30% dilute nitric acid in a vacuum mud mill, and then extruding into a honeycomb carrier through a vacuum extruder;

[0060] (4) The extruded honeycomb carrier is dried at 105° C. for 6 hours in a drying room, and roasted at 640° C. for 3 ...

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Abstract

The invention provides a method for preparing a denitration catalyst, which belongs to the technical field of catalysts and includes the following preparation steps: neutralizing a nitric acid solution and a sodium metaaluminate solution, adding a catalytic promoter during the neutralization process to obtain a colloidal solution, The catalytic promoter includes alkali metal silicate and rare earth metal nitrate; after aging the colloidal solution, pseudo-boehmite containing the catalytic promoter is obtained, and the pseudo-boehmite containing the promoter is kneaded with the nitric acid solution and then dried in sequence. After the first roasting, the catalyst carrier is obtained, and then the catalyst carrier is impregnated and adsorbed in a mixed solution of potassium permanganate, iron nitrate, calcium nitrate and water, followed by drying and second roasting to obtain a denitration catalyst. The present invention uses pseudo-boehmite to prepare a high-strength carrier, and then assembles it with vanadium-free metal active ingredients, thereby preparing a high-strength, large pore volume, high specific surface area and vanadium-free denitration catalyst.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO X ) is one of the main pollutants emitted by industrial production, which not only endangers human health, but also causes a series of environmental problems such as acid rain and photochemical smog. Therefore, efficient governance and control of nitrogen oxide emissions has become a major issue in current atmospheric governance. [0003] At present, the flue gas denitrification technology of coal-fired power plants mainly includes selective catalytic reduction (SCR), selective non-catalytic reduction and SNCR / SCR combined technology. Gas denitrification technology has high denitrification efficiency, mature and reliable, and the denitrification rate can generally reach 80% to 90%, which can reduce NO X The emission concentration is reduced to 100mg / m 3 . [0004] SCR ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/8892B01J2523/00B01J35/635B01J35/615B01J2523/23B01J2523/842B01J2523/72B01J2523/31B01J2523/13B01J2523/3712
Inventor 李国印俞杰王克鸿孔见岳欣李殿卿冯拥军陶海升
Owner JIANGSU JINGJING NEW MATERIALS
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