Catalyst for ammonia selective catalysis and oxidization and preparation method thereof

A catalytic oxidation and catalyst technology, applied in the field of air pollution control, can solve the problems of poor resistance to impact load, high requirements for growth environment, large equipment footprint, etc., achieving high mechanical strength, low cost and easy availability of raw materials, The effect of low wind resistance

Inactive Publication Date: 2016-10-26
CHINA SHIPBUILDING IND HAIBOWEI JIANGSU TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the fact that the adsorbents used in the adsorption and absorption methods need to be replaced regularly and are used in a large amount, the equipment is huge, and the regeneration is frequent, etc., its application is not widespread; the high-temperature incineration method will cause secondary pollution due to the high reaction temperature and the generated nitrogen oxides. Pollution; microbial decomposition method has great limitations because some microorganisms have high requirements on the growth environment, the ability to withstand impact load is not strong, and the equipment occupies a large area.
In the current research on ammonia catalytic oxidation technology, patent CN 1015545878A discloses a low-temperature ammonia selective catalytic oxidation catalyst Ag / Al 2 o 3 , but the selectivity of ammonia to nitrogen is low (less than 60%)
Patent CN 103442805A discloses ammonia selective catalytic oxidation catalyst Pt x -Fe-ZSM-5, this catalyst contains noble metal Pt, the cost is high, which limits the application in industrialization

Method used

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  • Catalyst for ammonia selective catalysis and oxidization and preparation method thereof
  • Catalyst for ammonia selective catalysis and oxidization and preparation method thereof
  • Catalyst for ammonia selective catalysis and oxidization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A cylindrical cordierite honeycomb ceramic carrier with a mass of 80 g and a mesh number of 80 (bottom diameter of 40 mm, height of 100 mm, triangular holes) was impregnated in 785 mL of 0.2 mol / L Al(NO 3 ) 3 In the aqueous solution, add an appropriate amount of ammonia water to adjust the pH=8~9, soak for 12 hours, place in an oven, and dry at 120°C for 18 hours. Place in a muffle furnace and bake at 600°C for 4 hours to obtain γ-Al 2 o 3 A honeycomb ceramic active carrier with a content of 10wt%. The above active carrier was impregnated in La(NO 3 ) 3 solution for 12h, and dried at 80°C for 12h, so that La 2 o 3 The content of is 10wt%, obtains catalyst precursor at this moment. The catalyst precursor was impregnated in 1mol / L Cu(NO 3 ) 2 12 h in the solution, dried at 120 °C for 12 h, and calcined at 550 °C for 3 h, so that the content of CuO in the catalyst precursor was 10 wt%.

[0043] The prepared honeycomb catalyst was placed in a quartz tube, and then...

Embodiment 2

[0046] Immerse a cylindrical cordierite honeycomb ceramic carrier with a mass of 80g and a mesh number of 80 (bottom diameter: 40mm, height: 100mm, triangular holes) in 785mL of 0.1mol / L TEOS aqueous solution, add appropriate amount of ammonia water to adjust pH=8 ~9 After soaking for 12 hours, place in an oven and dry at 120°C for 18 hours. Place in a muffle furnace and bake at 600°C for 4 hours to obtain SiO 2 A honeycomb ceramic active carrier with a content of 10wt%. The above active carrier was impregnated in La(NO 3 ) 3 solution for 12h, and dried at 80°C for 12h, so that La 2 o 3 The content of is 10wt%, obtains catalyst precursor at this moment. The catalyst precursor was impregnated in 1mol / L Cu(NO 3 ) 2 12 h in the solution, dried at 120 °C for 12 h, and calcined at 550 °C for 3 h, so that the content of CuO in the catalyst precursor was 10 wt%.

[0047] The prepared honeycomb catalyst was placed in a quartz tube, and then evaluated in a tube furnace. The re...

Embodiment 3

[0050] A cylindrical cordierite honeycomb ceramic carrier with a mass of 80 g and a mesh number of 80 (bottom diameter of 40 mm, height of 100 mm, triangular holes) was impregnated in 785 mL of 0.2 mol / L Al(NO 3 ) 3 In the aqueous solution, add an appropriate amount of ammonia water to adjust the pH=8~9, soak for 12 hours, place in an oven, and dry at 120°C for 18 hours. Place in a muffle furnace and bake at 600°C for 4 hours to obtain γ-Al 2 o 3 A honeycomb ceramic active carrier with a content of 10wt%. The above active carrier was impregnated in Y(NO 3 ) 3 solution for 12h, and dried at 80°C for 12h, so that Y 2 o 3 The content of is 10wt%, obtains catalyst precursor at this moment. The catalyst precursor was impregnated in 1mol / L Cu(NO 3 ) 2 12 h in the solution, dried at 120 °C for 12 h, and calcined at 550 °C for 3 h, so that the content of CuO in the catalyst precursor was 10 wt%.

[0051] The prepared honeycomb catalyst was placed in a quartz tube, and then e...

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Abstract

The invention discloses a catalyst for ammonia selective catalysis and oxidization and a preparation method thereof. The catalyst is composed of a first support cordierite honeycomb ceramic, a porous second support inorganic oxide, an assistant rare-earth oxide and active metals; the catalyst is obtained by: modifying the surface of the first support cordierite honeycomb ceramic by using the second support porous oxide, supporting the rare-earth oxide to a support to obtain a catalyst precursor and finally distributing the active metals in the catalyst precursor. The catalyst of the invention uses the cordierite honeycomb ceramic as the first support, the use of the porous honeycomb ceramic as the first support enables low price and easy obtaining of material, the preparation method is simple, the catalyst is high in mechanical strength, stable in performance, good in ammonia oxidation selectivity and high in conversion rate, and a reaction product is nontoxic and harmless.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and relates to a catalyst for selective catalytic oxidation of ammonia and a preparation method thereof. Background technique [0002] Ammonia is an odorous pollutant that poses a huge threat to human health and the ecological environment. The specific performance is that the solubility of ammonia is extremely high, which can stimulate and corrode the upper respiratory tract of animals or humans, and weaken the body's resistance to diseases. Ammonia seriously threatens the ecological environment, and it will produce NO and NO after oxidation 2 , N 2 O and other pollutants, forming acid rain, causing air pollution and greenhouse effect. Ammonia can also be converted into NO under certain conditions 2 - or NO 3 - , causing eutrophication of surface waters and possibly resulting in fragile ecosystems. In the industry, the tail gas emission in the production process of liquid am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/34B01D53/86B01D53/58
CPCB01J23/002B01D53/8634B01J23/34B01J23/83B01J2523/00B01J2523/17B01J2523/31B01J2523/3706B01J2523/36B01J2523/72
Inventor 向三明李宝荣宁永淼许柱
Owner CHINA SHIPBUILDING IND HAIBOWEI JIANGSU TECH DEV
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