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A kind of wide temperature denitrification catalyst and preparation method thereof

A denitrification catalyst and catalyst carrier technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the catalyst has high mechanical strength requirements, cannot guarantee service life, and is easy to collapse or peel off, etc. problems, achieve good denitrification efficiency, improve the ability to resist arsenic poisoning, and make it easier to decompose

Active Publication Date: 2021-01-26
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem facing these industrial furnaces and kilns in denitrification is the low flue gas temperature (180-350°C). Currently, commercial catalysts operating continuously in this temperature range have problems such as low denitrification activity, easy sulfur poisoning, and short service life. In addition, the cement industry with particularly high dust content in the flue gas also requires high mechanical strength of the catalyst. Existing commercial catalysts are prone to collapse or peel off under high dust washing, and the service life cannot be guaranteed.

Method used

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  • A kind of wide temperature denitrification catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve picric acid in ethanol to prepare a 0.01mol / L solution, then add deionized water, hydrochloric acid (concentration 37.5%), tetrabutyl titanate, antimony trichloride, stir well to obtain a hydrothermal solution, hydrothermal The volume ratio of ethanol, deionized water and hydrochloric acid in the solution is 1:3:2, the concentration of tetrabutyl titanate is 0.1mol / L, and the concentration of antimony trichloride is 0.001mol / L; The titanium substrate was placed in a reaction kettle, and kept at 140°C for 2 hours. After the reaction, the reaction kettle was naturally cooled to room temperature, and the titanium substrate was taken out, washed with ethanol and deionized water repeatedly to obtain a catalyst carrier; Add ammonium metavanadate to the ethanolamine solution, and after it is completely dissolved, add deionized water, cerium nitrate, and ammonium heptamolybdate, and stir evenly to obtain an impregnation solution. The concentration of ammonium metavanada...

Embodiment 2

[0031] Dissolve tartaric acid in ethanol to prepare a 0.03mol / L solution, then add deionized water, hydrochloric acid (concentration 37.5%), tetrabutyl titanate, antimony acetate, stir well to obtain a hydrothermal solution, and ethanol in the hydrothermal solution The volume ratio of , deionized water and hydrochloric acid is 1:4:2, the concentration of tetrabutyl titanate is 0.3mol / L, and the concentration of antimony acetate is 0.01mol / L; the hydrothermal solution and the cleaned titanium substrate are placed in the reaction In the kettle, keep warm at 160°C for 4h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the titanium substrate was taken out, washed with ethanol and deionized water repeatedly to obtain a catalyst carrier; Ammonium vanadate, after being completely dissolved, add deionized water, cerium nitrate, ammonium heptamolybdate, and stir evenly to obtain an impregnating solution. The ratio is 1:0.5:10; according to the cat...

Embodiment 3

[0034]Dissolve oxalic acid and citric acid in ethanol to prepare a 0.055mol / L solution, then add deionized water, hydrochloric acid (concentration 37.5%), tetrabutyl titanate, antimony nitrate, and stir to obtain a hydrothermal solution. The volume ratio of ethanol, deionized water, and hydrochloric acid in the solution is 1:4.5:2.5, the concentration of tetrabutyl titanate is 0.55mol / L, and the concentration of antimony nitrate is 0.02mol / L; the hydrothermal solution and the cleaned titanium substrate Put it in a reaction kettle and keep it warm at 180°C for 8 hours. After the reaction, the reaction kettle was naturally cooled to room temperature, and the titanium substrate was taken out, and washed with ethanol and deionized water repeatedly to obtain a catalyst carrier; Ammonium metavanadate was added to the solution, and after being completely dissolved, deionized water, cerium nitrate, and ammonium heptamolybdate were added, and the impregnation solution was obtained after...

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Abstract

The invention discloses a wide-temperature denitration catalyst and a preparation method thereof. The catalyst uses an antimony-doped titanium dioxide nanorod array as a carrier, vanadium pentoxide as an active component, and molybdenum oxide and cerium oxide as auxiliaries. The titanium dioxide nanorod array is directly grown on the substrate through a hydrothermal method, which enhances the binding force between titanium dioxide and the substrate, giving the catalyst higher wear resistance and service life; the orderly arranged titanium dioxide nanorod array can increase the specific surface area and increase active sites to improve catalyst activity; by doping titanium dioxide with antimony, the catalyst's resistance to sulfur poisoning can be enhanced. By loading cerium oxide and molybdenum oxide on the carrier, the low-temperature activity of the catalyst can be improved, the reaction temperature can be broadened, and the catalyst can have high denitrification efficiency, good stability, and strong selectivity in the temperature range of 150 to 420°C, and can be widely used in various industries. Kiln SCR denitrification system.

Description

technical field [0001] The invention relates to a wide-temperature denitrification catalyst and a preparation method thereof, belonging to the technical field of high-efficiency catalysts and air pollutant prevention and control. Background technique [0002] Selective catalytic reduction (SCR) denitrification is one of the most widely used and most mature flue gas denitrification technologies in the world. The core of its technology is the use of denitrification catalysts, which have the advantages of high purification rate and reliable operation. The denitrification catalyst used in coal-fired power plants has been commercially used for many years, and the technology is relatively mature. The operating temperature of this type of medium-high temperature catalyst is usually 320-420°C. However, in the face of the increasingly severe pollution control situation, the nitrogen oxide emissions of other industrial furnaces will also be strictly controlled. Coking, cement, glass, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01J37/10B01J37/02B01J37/08B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/28B01J37/0201B01J37/088B01J37/10B01D2258/0283B01J35/615
Inventor 李倩王虎黄力纵宇浩董晓真严巍常峥峰
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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