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Honeycomb integrated low-temperature denitrification catalyst and preparation method thereof

A low-temperature denitration and catalyst technology, applied in the field of denitration catalysts, can solve the problems of the honeycomb monolithic catalyst being difficult to manufacture, the plasticity of the green body being reduced, and the denitration activity being low, and achieving the effects of low production cost, easy operation and simple preparation method.

Active Publication Date: 2018-05-29
CHINA BUILDING MATERIALS ACAD
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  • 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 integrated low-temperature denitrification catalyst and preparation method thereof
  • Honeycomb integrated low-temperature denitrification catalyst and preparation method thereof

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Experimental program
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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 ) 3 ·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) adopt the method for vacuum extraction, artificial coating, described slurry is coated on the honeycomb cordierite carrier of 400 order 150mm*150mm*100mm, remove redundant slurry;

[0035] 5) The coated honeycomb cordierite carrier was dried at 120° C. for 4 hours, then he...

Embodiment 2

[0038] 1) 537g mass fraction is 50% Mn(NO 3 ) 2 aqueous solution and 163g of Ce(NO 3 ) 3 ·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 honeyco...

Embodiment 3

[0045] 1) 537g mass fraction is 50% Mn(NO 3 ) 2 aqueous solution and 163g of Ce(NO 3 ) 3 ·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) adopt the method for vacuum extraction, artificial coating, described slurry is coated on the honeycomb cordierite carrier of 400 ord...

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Abstract

The invention relates to a honeycomb integrated low-temperature denitration catalyst and its preparation method. The specific steps are: 1) Dissolve iron salt or cobalt salt or copper salt or nickel salt and manganese salt and cerium salt in water to form a metal salt solution; 2 ) Immerse titanium dioxide into the metal salt solution to form a suspension, and prepare the suspension into a catalyst active component using an impregnation method, a co-precipitation method, or a hydrothermal method; 3) using the catalyst The active component is mixed with the inorganic binder, organic polymer solution, surfactant and water, stirred, and configured into a slurry; 4) Apply the slurry to the honeycomb cordierite carrier; 5) Coat the The honeycomb cordierite carrier is dried and calcined to obtain a honeycomb monolithic low-temperature denitrification catalyst. The catalyst obtained by the preparation method of the present invention has a high loading rate of active components on the carrier, a firm combination between the coating and the carrier, and high low-temperature denitration activity.

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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Patent Type & Authority Patents(China)
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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