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Cerium oxide carrier based flat type high temperature sulfur-resistant SCR denitration catalyst and preparation method thereof

A denitrification catalyst, flat-plate technology, applied in the field of environmental protection technology and denitrification catalysis, can solve the problems of inapplicability to large-scale industrial applications, high price, poor high-temperature hydrothermal stability, etc., and achieve easy large-scale industrial production and simple and easy preparation process line, improve the effect of mechanical properties

Active Publication Date: 2019-05-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molecular sieve catalysts have excellent denitrification activity in high-temperature (450-650°C) flue gas, but at the same time have problems such as poor high-temperature hydrothermal stability, non-sulfur tolerance, and high price, making them unsuitable for large-scale industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 describes a flat-plate high-temperature sulfur-resistant SCR denitration catalyst based on cerium oxide and its preparation method. The specific steps include:

[0031] (1) Preparation of rod-shaped nano-cerium oxide carrier

[0032] Weigh 2500g Ce(NO 3 ) 3 ·6H 2 Dissolve O in 5.5L of water to obtain a cerium salt solution, add 5L of 4mol / L NaOH solution to the solution, and stir at room temperature for 0.5h; transfer the mixed solution and the precipitate into a hydrothermal reactor, and react at 80°C 24h; fully cooled to room temperature, centrifuged to obtain solid precipitation, fully washed with water, dried at 60°C for 20h, and finally roasted at 500°C to obtain about 990g of rod-shaped nano-CeO 2 carrier.

[0033] (2) Preparation of catalyst sludge

[0034] Weigh 57.23g of ammonium metatungstate and dissolve it in 350mL of water to obtain ammonium metatungstate solution; weigh 14.22g of stannous chloride dihydrate and dissolve it in 10mL of water t...

Embodiment 2

[0039] Example 2 also describes a flat-plate high-temperature sulfur-resistant SCR denitration catalyst based on cerium oxide carrier and its preparation method. The specific steps include:

[0040] (1) Preparation of rod-shaped nano-cerium oxide carrier

[0041] Weigh 1800g Ce 2 (SO 4 ) 3 ·8H 2 Dissolve O in 0.85L of water to obtain a cerium salt solution, add 1.6L of 10mol / L KOH solution to the solution, and stir at room temperature for 2h; transfer the mixed solution and the precipitate together into a hydrothermal reactor, and react at 140°C 6h; fully cooled to room temperature, centrifuged to obtain a solid precipitate, fully washed with water, dried at 120°C for 8h, and finally roasted at 750°C to obtain about 870g of rod-shaped nano-CeO 2 carrier.

[0042] (2) Preparation of catalyst sludge

[0043] Weigh 308.98g of ammonium metatungstate and dissolve it in 450mL of water to obtain ammonium metatungstate solution; weigh 191.99g of stannous chloride dihydrate and d...

Embodiment 3

[0048] Example 3 describes another flat-plate high-temperature sulfur-resistant SCR denitration catalyst based on cerium oxide carrier and its preparation method. The specific steps include:

[0049] (1) Preparation of rod-shaped nano-cerium oxide carrier

[0050] Weigh 1700g CeCl 3 ·7H 2 O was dissolved in 3L of water to obtain a cerium salt solution, and 3L of 5mol / L ammonia solution was added to the solution, and stirred at room temperature for 2h; the mixed solution and the precipitate were transferred together into a hydrothermal reactor, and reacted at 140°C for 20h; Fully cooled to room temperature, centrifuged to obtain a solid precipitate, fully washed with water, dried at 85°C for 12 hours, and finally roasted at 720°C to obtain about 784g of rod-shaped nano-CeO 2 carrier.

[0051] (2) Preparation of catalyst sludge

[0052] Weigh 120.48g of ammonium metatungstate and dissolve it in 300mL of water to obtain ammonium metatungstate solution; weigh 149.72g of stanno...

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Abstract

The invention belongs to the fields of environment protection technologies and denitration catalysis, and specifically relates to a cerium oxide carrier based flat type high temperature sulfur-resistant SCR denitration catalyst and a preparation method thereof. Rod like nano cerium oxide is taken as the carrier, tungsten trioxide is taken as the active component, tin dioxide is taken as the catalyst additive, inorganic and organic structure additives are added to improve the mechanical properties and pore structure of the catalyst, and finally the flat type SCR denitration catalyst, which is suitable for a high temperature sulfur containing environment, is obtained by a rolling-coating technology. The provided catalyst has the advantages of excellent high temperature (450-700 DEG C) denitration activity, thermal activity, and sulfur resistant property, at the same time, the production technology is simple, the problem that a conventional SCR denitration catalyst is inactivated in hightemperature flue gas during the sintering process is solved, and the catalyst has a wide application prospect in industry.

Description

technical field [0001] The invention belongs to the field of environmental protection technology and denitrification catalysis, and specifically relates to a flat-plate high-temperature sulfur-resistant SCR denitrification catalyst based on a cerium oxide carrier and a preparation method thereof. Background technique [0002] NOx is one of the main pollutants in the exhaust gas of industrial boilers. A large amount of NOx can lead to serious environmental problems such as photochemical smog, acid rain, greenhouse effect, and ozone layer destruction. It can also directly endanger human health and cause respiratory diseases. With the gradual improvement of environmental protection awareness, the state has formulated relevant NOx emission standards according to the characteristics of flue gas emitted by different industries. In recent years, in order to further improve the country's environmental protection level, more and more industry standards have been formulated and promul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J32/00B01J23/10B01D53/86B01D53/56
Inventor 杨勇平陆强刘吉徐明新
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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