Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for high-specific surface anti-alkalosis denitration catalyst applicable to cement kiln

A denitration catalyst and high specific surface technology, which is applied in the field of NOx reduction in cement kilns, can solve the problems of less research on catalyst alkali metal poisoning and so on.

Active Publication Date: 2013-08-28
BEIJING UNIV OF TECH
View PDF2 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There have been many low-temperature studies on denitrification catalysts at home and abroad, but relatively few studies on alkali metal poisoning of catalysts

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Example 1: Dissolve 16g of titanyl sulfate in 150ml of distilled water, stir in a water bath at 60°C for 1 hour and dissolve into a clear solution, mix and stir 5ml of tetraethylorthosilicate, 10ml of ethanol, and 20ml of distilled water for 1 hour to prepare SiO2 sol, mix the above two After mixing the two solutions in a water bath at 60°C, add 19.6g of manganese acetate and 3.04g of cerium nitrate and continue to stir. Add 50ml of 2mol / L urea solution to the prepared mixed solution in a water bath at 95°C and stir for 1h, 100ml of 25% ammonia water, 60ml of 30% hydrogen peroxide was stirred for 2 hours, and the obtained precipitate was centrifugally washed twice with distilled water and absolute ethanol twice, then dried at 75°C for 12 hours, and calcined at 450°C for 4 hours to prepare catalyst powder.

[0016] Denitrification rate test: catalytic reaction conditions are 1000ppmNO, 1000ppmNH 3 , 5%O 2 , N 2 As the carrier gas, the gas flow rate is 2000ml / min, and t...

example 2

[0018] Example 2: Dissolve 16g of titanyl sulfate in 1000ml of distilled water, stir in a water bath at 60°C for 1 hour, and then dissolve into a clear solution. Add 7g of silica sol solution (the content of SiO2 is 30% (wt%)) to the above mixed solution to continue Stir for 1 hour, mix the above two solutions in a water bath at 60°C, add 9.8g of manganese acetate, 3.04g of cerium nitrate, and 2.83g of ferric nitrate to continue stirring, and add 2mol / L urea solution to the prepared mixed solution in a water bath at 95°C Stir 50ml for 1h, 85ml of 25% ammonia water, 50ml of 30% hydrogen peroxide and stir for 2h, centrifuge the obtained precipitate twice with distilled water, wash twice with absolute ethanol, dry at 90°C for 6h, and calcinate at 600°C for 2h Then prepare catalyst powder.

[0019] Denitrification rate test: catalytic reaction conditions are 1000ppmNO, 1000ppmNH 3 , 5%O 2 , N 2 As the carrier gas, the gas flow rate is 2000ml / min, and the space velocity is 27000...

example 3

[0021] Example 3: Dissolve 16g of titanyl sulfate in 500ml of distilled water, and dissolve it into a clear solution after stirring in a water bath at 60°C for 1 hour. Mix and stir 3ml of tetraethylorthosilicate, 16ml of ethanol, and 35ml of distilled water for 1 hour to prepare SiO2 sol. After mixing the two solutions in a water bath at 60°C, add 7.16g of manganese nitrate, 3.04g of cerium nitrate, and 2.03g of nickel nitrate to continue stirring. The prepared mixed solution was added to 100ml of 1mol / L urea solution in a water bath at 65°C and stirred for 3h, 25% Stir 80ml of ammonia water with 30% concentration and 50ml of hydrogen peroxide at 30% concentration for 2 hours, and then centrifugally wash the obtained precipitate twice with distilled water and absolute ethanol for 2 times, then dry at 90°C for 8h, and calcinate at 550°C for 3h to prepare catalyst powder.

[0022] Denitrification rate test: catalytic reaction conditions are 1000ppmNO, 1000ppmNH 3 , 5%O 2 , N 2...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a preparation method for a high-specific surface anti-alkalosis denitration catalyst applicable to a cement kiln, which belongs to the field of reduction of NOx in the cement kiln. The preparation method comprises the following steps: uniformly mixing a titanium source solution with SiO2 sol, then adding a manganese salt, a cerium salt and an auxiliary agent and continuing stirring so as to obtain a mixed solution; successively adding a urea solution, ammonia water and hydrogen peroxide into the mixed solution until no precipitate is produced and continuing stirring for 1 to 3 h; and then carrying out centrifugal washing sequentially with distilled water and absolute ethyl alcohol and carrying out drying at a temperature of 75 to 110 DEG C for 6 to 24 h and then calcining at a temperature of 450 to 650 DEG C for 2 to 6 h so as to prepare the 40-mesh to 60-mesh catalyst. Compared with catalysts having same components and prepared by using a sol-gel method and an impregnation method, the catalyst prepared in the invention has the advantages of a high specific surface area, a high denitration rate and alkali resistance. The preparation method for the catalyst is simple, easy to operate and applicable to industrial production.

Description

technical field [0001] The invention belongs to the field of NOx reduction of cement kilns. Background technique [0002] The main pollutants emitted during the cement clinker calcination process are NOx and dust. During the cement clinker calcination process, NOx mainly comes from nitrogen in high-temperature fuels and nitrogen-containing compounds in raw materials. According to the data of the first national survey of pollution sources in 2007, the average NOx emission coefficient of the new dry process cement kiln is 1100mg / Nm 3 . In 2010, my country's cement production has exceeded 1.8 billion tons, and the output of cement clinker is about 1.2 billion tons. According to the above emission coefficient estimation, the cement industry emits about 2.2 million tons of NOx, accounting for one tenth of the national NOx emissions in 2010. Therefore, it is of great significance to reduce NOx in cement kilns. [0003] The honeycomb-type denitrification catalytic material used ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J23/34B01J23/889B01D53/86B01D53/56
Inventor 崔素萍张良静马晓宇郭红霞罗小根刘启栋兰明章王亚丽
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com