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Thin-wall honeycomb type low-temperature sulfur-resistant SCR denitration catalyst and preparation method thereof

A denitrification catalyst, honeycomb technology, applied in the field of environmental protection denitrification catalysis, can solve the problems of easy poisoning and deactivation, achieve strong anti-sulfur poisoning performance, reduce exposure, and reduce the effect of SO2 oxidation rate

Active Publication Date: 2019-10-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem that existing low-temperature SCR catalysts are easily poisoned and deactivated in water-containing sulfur-containing flue gas, and provides a thin-walled honeycomb low-temperature sulfur-resistant SCR denitrification catalyst and a preparation method thereof, which can significantly improve the catalytic performance of the catalyst. Low temperature activity and sulfur poisoning resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing a thin-walled honeycomb low-temperature sulfur-resistant SCR denitration catalyst in this embodiment, the specific steps include:

[0034] (1) Under stirring conditions, add 2000g tetraethyl orthosilicate to 8L 0.1mol / L cetyltrimethylammonium bromide solution, stir vigorously at 50°C for 12h; then add 1L concentrated nitric acid Add it into the mixed solution and continue stirring for 48 hours; the product is filtered, washed until neutral, dried, and calcined in a muffle furnace at 600° C. for 12 hours to obtain silicon dioxide nanotubes.

[0035] (2) Weigh 1.9L of 2mol / L titanium sulfate solution, and after adjusting the pH to 9 with 1mol / L sodium hydroxide solution, filter and wash the precipitate until there is no sulfate; After the nanotubes are mixed evenly, add an appropriate amount of 2L 1mol / L nitric acid solution, and stir at a constant temperature of 80°C for 48h; the obtained precipitate is filtered, washed, and dried, and then roasted...

Embodiment 2

[0044] A method for preparing a thin-walled honeycomb low-temperature sulfur-resistant SCR denitration catalyst in this embodiment, the specific steps include:

[0045] (1) Under stirring conditions, add 2000g tetraethyl orthosilicate to 8L 0.1mol / L cetyltrimethylammonium bromide solution, stir vigorously at 50°C for 12h; then add 1L concentrated nitric acid Add it into the mixed solution and continue stirring for 48 hours; the product is filtered, washed until neutral, dried, and calcined in a muffle furnace at 600° C. for 12 hours to obtain silicon dioxide nanotubes.

[0046] (2) Weigh 1.9L of 2mol / L titanium sulfate solution, and after adjusting the pH to 9 with 1mol / L sodium hydroxide solution, filter and wash the precipitate until there is no sulfate; After the nanotubes are mixed evenly, add an appropriate amount of 2L 1mol / L nitric acid solution, and stir at a constant temperature of 80°C for 48h; the obtained precipitate is filtered, washed, and dried, and then roasted...

Embodiment 3

[0055] The preparation method of a thin-walled honeycomb low-temperature sulfur-resistant SCR denitration catalyst provided in this embodiment, the specific steps include:

[0056] (1) Under stirring conditions, add 2000g tetraethyl orthosilicate to 8L 0.1mol / L cetyltrimethylammonium bromide solution, stir vigorously at 50°C for 12h; then add 1L concentrated nitric acid Add it into the mixed solution and continue stirring for 48 hours; the product is filtered, washed until neutral, dried, and calcined in a muffle furnace at 600° C. for 12 hours to obtain silicon dioxide nanotubes.

[0057] (2) Weigh 1.9L of 4mol / L titanium sulfate solution, and after adjusting the pH to 9 with 2mol / L sodium hydroxide solution, filter and wash the precipitate until there is no sulfate; After the nanotubes are mixed evenly, add an appropriate amount of 2.4L 1mol / L nitric acid solution, and stir at a constant temperature of 80°C for 48h; the resulting precipitate is filtered, washed, and dried, a...

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Abstract

The embodiment provides a thin-wall honeycomb type low-temperature sulfur-resistant SCR denitration catalyst. A catalyst carrier is a titanium dioxide-coated silicon dioxide composite nanotube, an active component is vanadium pentoxide, and a catalytic assistant is molybdenum trioxide and chromium trioxide. The thin-wall honeycomb SCR denitration catalyst with low-temperature sulfur resistance performance is prepared by adopting an extrusion molding process. The catalyst has good low-temperature activity and sulfur poisoning resistance, can solve the problems of low activity and sulfur poisoning of the catalyst in low-temperature flue gas, and is suitable for low-temperature sulfur-containing flue gas; by adding various inorganic and organic forming additives and optimizing the drying androasting processes, the wall thickness of the catalyst is reduced on the basis of maintaining the mechanical strength of the catalyst, the sulfur poisoning resistance of the catalyst is improved, theproduction cost is reduced, and the thin-wall honeycomb type low-temperature sulfur-resistant SCR denitration catalyst has good economic benefits. The embodiment also provides a preparation method ofthe thin-wall honeycomb type low-temperature sulfur-resistant SCR denitration catalyst.

Description

technical field [0001] The invention belongs to the technical field of environmental protection denitrification catalysis, and in particular relates to a thin-walled honeycomb low-temperature sulfur-resistant SCR denitrification catalyst. The invention also provides a preparation method of the thin-walled honeycomb low-temperature sulfur-resistant SCR denitration catalyst. Background technique [0002] Nitrogen oxides (NO x ), sulfur dioxide (SO 2 ) and other pollutants have serious harm to the environment and are an important source of air pollution. With the continuous improvement of people's awareness of environmental protection, the pollutant discharge standards formulated by our country are becoming more and more stringent. According to the "Emission Standard of Air Pollutants for Thermal Power Plants (GB13223-2011)", since January 1, 2012, the nitrogen oxide emission of newly built coal-fired boilers should be lower than 100mg / m 3 , the nitrogen oxide emission of n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01D53/86B01D53/56B01J35/04B01J35/02B01J35/00
CPCB01J23/002B01J23/28B01D53/8628B01J2523/00B01D2251/2062B01D2258/0283B01J35/56B01J35/40B01J2523/31B01J2523/41B01J2523/47B01J2523/55B01J2523/67B01J2523/68
Inventor 陆强裴鑫琦吴洋文密腾阁杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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