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High-temperature-resisting SCR (Selective Catalytic Reduction) flue gas denitration catalyst and preparation method thereof

A denitrification catalyst and high-temperature-resistant technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as difficult molding and demolding during the production process, difficulty in adapting the catalyst to high temperature, and unsatisfactory denitrification efficiency. Achieve the effects of widening the working temperature window, long life, and improving high temperature resistance

Inactive Publication Date: 2017-06-09
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the traditional catalysts used to remove nitrogen oxides can remove nitrogen oxides in a suitable temperature range, there are still shortcomings such as the catalyst is difficult to adapt to high temperature, the service life is short, the production process is not easy to form and demould, and the porosity is not ideal.
Some catalysts suitable for high-temperature environments have the problem of small specific surface area and unsatisfactory denitrification efficiency

Method used

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  • High-temperature-resisting SCR (Selective Catalytic Reduction) flue gas denitration catalyst and preparation method thereof
  • High-temperature-resisting SCR (Selective Catalytic Reduction) flue gas denitration catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) SiC-Al 2 O 3 Preparation of composite carrier: take silicon carbide powder with a particle size of 100 nm and add it to a dodecyl phosphate ester triethanolamine alcohol solution with a concentration of 0.01 mol / L, stir at 60 °C for 4 h, suction filtration, and use ethanol and After washing with distilled water, vacuum drying at 40°C for 4h;

[0024] The modified dry powder was placed in an aqueous solution of aluminum chloride with a mass fraction of 4%, stirred evenly at 20°C, and then added with a sodium carbonate solution with a mass fraction of 15%, and stirred until the solution produced a white gelatinous precipitation. After completion, it was left to age at room temperature for 4 hours;

[0025] After the aging, the precipitate is washed successively with a weakly alkaline solution with a pH of 8 and distilled water, and washed 4 to 5 times respectively. After the washing is completed, vacuum drying at 40° C. to obtain the SiC-Al 2 O 3 Composite carrier...

Embodiment 2

[0029] (1) SiC-Al 2 O 3 Preparation of composite carrier: take silicon carbide powder with a particle size of 300 nm and add it to a dodecyl phosphate ester triethanolamine alcohol solution with a concentration of 0.02 mol / L, stir at 70 °C for 5 h, suction filtration, and use ethanol and After washing with distilled water, vacuum drying at 50°C for 5h;

[0030] The modified dry powder was placed in an aqueous solution of aluminum chloride with a mass fraction of 6%, stirred evenly at 25°C, and then added with a sodium carbonate solution with a mass fraction of 20%, and stirred until a white gelatinous precipitation was produced, and the precipitation was complete. After 5 hours of aging at room temperature;

[0031] After the aging, the precipitate is washed successively with a weakly alkaline solution with a pH of 9 and distilled water, and washed 4 to 5 times respectively. After the washing is completed, vacuum drying at 50° C. to obtain the SiC-Al 2 O 3 Composite carrie...

Embodiment 3

[0035] (1) SiC-Al 2 O 3 Preparation of composite carrier: take silicon carbide powder with a particle size of 500 nm and add it to a dodecyl phosphate ester triethanolamine alcohol solution with a concentration of 0.015 mol / L, stir at 80 °C for 6 h, suction filtration, and sequentially use ethanol and After washing with distilled water, vacuum drying at 60°C for 6h;

[0036] The modified dry powder was placed in an aqueous solution of aluminum chloride with a mass fraction of 8%, stirred uniformly at 30 ° C, and then added with a sodium carbonate solution with a mass fraction of 20%, and stirred until a white gelatinous precipitation was produced, and the precipitation was complete. After 6 hours of aging at room temperature;

[0037] After the aging, the precipitate is washed successively with a weakly alkaline solution with a pH of 8.5 and distilled water, and washed 4 to 5 times respectively. After the washing is completed, vacuum drying at 70° C. to obtain the SiC-Al 2 ...

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Abstract

The invention discloses a high-temperature-resisting SCR (Selective Catalytic Reduction) flue gas denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a ceramic powder composite carrier; mixing raw materials; pre-extruding; aging; extruding, drying, calcining; assembling modules, wherein the ceramic powder is a SiC-AlO2O3 composite carrier; the surface of SiC is modified by adopting a surfactant, and SiC particles are subjected to surface coating by using AlO2O3 sol, compared with the prior art, the preparation method of the high-temperature-resisting SCR flue gas denitration catalyst, disclosed by the invention, has the advantages that the high-temperature-resisting SCR flue gas denitration catalyst has high temperature resistance, wide working temperature window, great specific surface area, high catalytic activity and long service life.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a high temperature resistant SCR flue gas denitration catalyst and a preparation method thereof. Background technique [0002] my country's energy structure is dominated by coal, and coal-fired power plants produce a large amount of dust, SO x , NO x and harmful metal elements. Nitrogen oxides (NO x ) is more harmful to the environment than sulfide, NO in the atmosphere x It can cause a series of problems such as acid rain, photochemical smog, and surface water eutrophication, which damage the ecological environment and endanger human health. [0003] Selective catalytic reduction (SCR) has become a popular method for removing NO in developed countries due to its advantages of low reaction temperature, high purification rate, reliable operation and low secondary pollution. x preferred method. In SCR technology, the catalyst is the core, and its cost accounts for about 20% to 40% of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/90B01D53/56
CPCB01J23/30B01D53/8628B01D53/90B01D2255/2065B01D2255/20715B01D2255/20723B01D2255/20776B01D2255/2092B01D2255/30B01D2258/0283
Inventor 徐辉江厚兵刘江峰李林朝王光应
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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