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Honeycomb integral type low temperature denitrifying catalyst and preparation method thereof

A low-temperature denitrification and catalyst technology, which is applied in the field of denitrification catalysts, can solve the problems of difficulty in making honeycomb monolithic catalysts, reduced green body plasticity, and low denitrification activity, and achieve low production costs, easy operation, and high activity.

Active Publication Date: 2016-07-06
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the manganese-based honeycomb integral denitration catalyst is prepared by this method, the manganese loading content is low and it is easy to form. However, the prepared catalyst has low denitration activity at low temperature. Only when the manganese loading is high can the activity of the catalyst be guaranteed at low temperature, but this will lead to the plasticity of the green body. Reduce the difficulty of molding, and it is easy to crack during the roasting process, and the honeycomb monolithic catalyst is not easy to make

Method used

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  • Honeycomb integral type low temperature denitrifying catalyst and preparation method thereof
  • Honeycomb integral type low temperature denitrifying catalyst and preparation method thereof

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Effect test

Embodiment 1

[0031] 1) 537g mass fraction is 50% Mn(NO 3 ) 2 aqueous solution and 163g of Ce(NO 3 ) 2 ·6H 2 O, 48.4g of Fe(NO 3 ) 3 Add it into 1000g of water, stir until dissolved to obtain a metal salt solution;

[0032] 2) Add 1000g of titanium dioxide to the metal salt solution to obtain a suspension, stir the suspension until uniformly dispersed, and heat at 120°C for 6h to obtain a dry catalyst powder;

[0033] 3) Mix 1000g of catalyst dry powder, 40g of aluminum sol with a mass fraction of 60%, 30g of sodium carboxymethylcellulose with a mass fraction of 1%, 15g of Tween-20 and 1800g of water, and stir for 1h to obtain a slurry , the solid content of the slurry is 35%, and the pH value is 3.5;

[0034] 4) Apply the slurry to a 400-mesh 150mm*150mm*100mm honeycomb cordierite carrier by vacuum extraction and manual coating to remove excess slurry;

[0035] 5) The coated honeycomb cordierite carrier was dried at 120° C. for 4 hours, then heated to 500° C. at a rate of 2° C. / min...

Embodiment 2

[0038] 1) 537g mass fraction is 50% Mn(NO 3 ) 2 aqueous solution and 163g of Ce(NO 3 ) 2 ·6H 2 O, 48.4g of Fe(NO 3 ) 3 Add it into 1000g of water, stir until dissolved to obtain a metal salt solution;

[0039]2) Add 1000g of titanium dioxide to the metal salt solution to obtain a suspension, stir the suspension until uniform, adjust its pH to 11 with ammonia water with a mass fraction of 25%, stir for 6 hours, wash, and filter to obtain a catalyst solid precipitation;

[0040] 3) Mix the 1000g of catalyst solid precipitation, 40g of aluminum sol with a mass fraction of 60%, 30g of sodium carboxymethylcellulose with a mass fraction of 1%, 15g of Tween-20 and 1800g of water, and stir for 1h to obtain a slurry material, the solid content of the slurry is 35%, and the pH value is 3.8;

[0041] 4) Apply the slurry to a 400-mesh 150mm*150mm*100mm honeycomb cordierite carrier by vacuum extraction and manual coating to remove excess slurry;

[0042] 5) Dry the coated honeycom...

Embodiment 3

[0045] 1) 537g mass fraction is 50% Mn(NO 3 ) 2 aqueous solution and 163g of Ce(NO 3 ) 2 ·6H 2 O, 48.4g of Fe(NO 3 ) 3 Add it into 1000g of water, stir until dissolved to obtain a metal salt solution;

[0046] 2) Add 1000g of titanium dioxide to the metal salt solution to obtain a suspension, stir the suspension until uniform, adjust its pH to 10 with ammonia water with a mass fraction of 25%, and conduct a hydrothermal reaction at 180°C in a reactor 6h, washing, filtering to obtain catalyst solid precipitation;

[0047] 3) Mix the 1000g of catalyst solid precipitation, 40g of aluminum sol with a mass fraction of 60%, 30g of sodium carboxymethylcellulose with a mass fraction of 1%, 15g of Tween-20 and 1800g of water, and stir for 1h to obtain a slurry material, the solid content of the slurry is 31%, and the pH value is 3.6;

[0048] 4) Apply the slurry to a 400-mesh 150mm*150mm*100mm honeycomb cordierite carrier by vacuum extraction and manual coating to remove excess...

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Abstract

The invention discloses a honeycomb integral type low temperature denitrifying catalyst and a preparation method thereof. The preparation method comprises the following specific steps: 1) dissolving ferric sat or cobalt salt or copper salt or nickel salt and manganous salt or cerium salt in water to form a metallic salt solution; 2) soaking titanium dioxide in the metallic salt solution to form suspension, using an impregnation method or coprecipitation method or hydrothermal method to prepare the suspension into catalyst active components; 3) mixing the catalyst active components with the inorganic binding agent, the organic polymer solution, the surfactant and water, stirring to form a slurry; 4) coating the slurry on a honeycomb cordierite carrier; and 5) drying the coated honeycomb cordierite carrier, and calcining, to obtain the honeycomb integral type low temperature denitrifying catalyst. The active components of the catalyst obtained through the preparation method of the invention are high in loading rate on the carrier, the coating and the carrier are firmly bound, and the low temperature denitrifying activity is high.

Description

technical field [0001] The invention relates to a denitration catalyst, in particular to a honeycomb integral low-temperature denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides can produce photochemical smog, acid rain, ozone hole and greenhouse effect, and are one of the main pollutants in the atmosphere. At present, flue gas denitrification is one of the effective methods to control the emission of nitrogen oxides in the process of coal combustion. Selective catalytic reduction (SCR) technology is widely used in flue gas denitrification due to its high denitrification efficiency, good selectivity, stable and reliable operation, etc. has been widely used in the process. [0003] Loading active components on the surface of cordierite carrier is one of the methods to prepare honeycomb monolithic denitration catalyst. The prior art proposes a honeycomb monolithic denitration catalyst prepared by extrusion molding. When the m...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J35/04B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J23/002B01J23/8892B01D2255/20761B01D2255/20746B01D2255/20738B01J2523/00B01J35/56B01J2523/842B01J2523/31B01J2523/3712B01J2523/47B01J2523/72B01J2523/17B01J2523/845B01J2523/847
Inventor 赵春林梁海龙吴彦霞唐婕陈鑫胡利明陈玉峰刘海林霍艳丽
Owner CHINA BUILDING MATERIALS ACAD
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