Low-temperature SCR (selective catalytic reduction) smoke gas efficient denitration catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of low denitrification efficiency, achieve good low temperature activity, and good nitrogen oxide removal High efficiency, good water and sulfur resistance

Inactive Publication Date: 2017-06-20
大连瑞克科技股份有限公司
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Problems solved by technology

[0011] In order to solve the problem of low denitrification efficiency of low-temperature SCR denitrification catalysts in the prior art at 130-250°C, the present invention provides a low-temperature SCR flue gas high-efficiency denitrification catalyst and its preparation method to improve decombustion at lower low temperature conditions. The efficiency of nitrogen oxides in the flue gas of coal boilers to achieve the emission standards of flue gas from coal-fired boilers and flue gas from most industrial kilns

Method used

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  • Low-temperature SCR (selective catalytic reduction) smoke gas efficient denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 11 grams of ammonium metatungstate (containing 91% by mass of WO3), put it into a 200 ml beaker, add 95 ml of deionized water, and stir to dissolve it completely;

[0029] (2) Weigh 73 grams of TiO2 powder that has been dried at 120°C for 12 hours, put it into the ammonium metatungstate solution prepared in step (1); stir, soak for 30 minutes, and then put it on a water bath at 80°C , under stirring, evaporate most of the water;

[0030] (3) Put the material obtained in step (2) in a drying oven and dry at 120°C for 8 hours;

[0031] (4) Put the material obtained in step (3) in a muffle furnace, heat up and roast. Heating program: from room temperature to 450°C over 4 hours, then keep the temperature at 450°C for 3 hours, the obtained material is ground to 200 mesh, and WO3 / TiO2 powder is obtained;

[0032] (5) Weigh 25.22 grams of cerium nitrate hexahydrate, put it into a 200 ml beaker, add 95 ml of deionized water, and stir to dissolve it completely;

[0...

Embodiment 2

[0043] In Example 2, the raw material ratio and steps of catalyst preparation are basically the same as in Example 1, only the step (9) in Example 1 is omitted. That is, under stirring, pour the WO3 / TiO2 powder obtained in step (4) and the ethanol solution of antimony trichloride obtained in step (6) into the cerium nitrate solution obtained in step (5), stir evenly, dip for 30 minutes, and remove Put it on a water bath at 80°C, evaporate most of the water to dryness; put the obtained material in a drying oven, dry at 120°C for 8 hours, and grind the obtained solid material to 200 mesh. Then, proceed to step (10) to obtain a V2O5-Sb2O3-CeO3-WO3 / TiO2 catalyst.

[0044] According to the addition amount of various raw material precursors in the preparation of the catalyst, the ratio of parts by weight of each component of the catalyst is V2O5: Sb2O3: CeO3: WO3: TiO2 = 5:2:10:10:73.

Embodiment 3

[0046] (1) Weigh 8.79 grams of ammonium metatungstate (containing WO3: 91%), put it into a 200 ml beaker, add 95 ml of deionized water, and stir to dissolve it completely;

[0047] (2) Weigh 77 grams of TiO2 powder that has been dried at 120°C for 12 hours, put it into the ammonium metatungstate solution that has been completely dissolved in step (1); stir, soak for 30 minutes, and then put it in a water bath at 80°C On, stirring, evaporate most of the water;

[0048] (3) Put the material obtained in (2) in a drying oven and dry at 120°C for 8 hours;

[0049] (4) Put the material obtained in (3) in a muffle furnace, heat up and roast, the temperature rise program: from room temperature to 450°C over 4 hours, and keep the temperature at 450°C for 3 hours, the obtained material is ground to 200 mesh, and WO3 / TiO2 is obtained pink;

[0050] (5) Weigh 25.22 grams of cerium nitrate hexahydrate, put it into a 200 ml beaker, add 95 ml of deionized water, and stir to dissolve it com...

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Abstract

The invention relates to a low-temperature SCR (selective catalytic reduction) smoke gas efficient denitration catalyst and a preparation method thereof, and belongs to the technical field of catalyst manufacturing. The catalyst uses titanium dioxide as carriers, and contains tungsten oxide, vanadium oxide and antimony oxides or contains rare earth metal cerium oxide; the catalyst without rare earth metal cerium oxide has a little lower denitration efficiency than the catalyst containing rare earth metal cerium oxide. The denitration efficiency of the catalyst reaches 85 percent or more at the low temperature of 130 degrees; the value is much higher than the current condition of the denitration efficiency of being less than 50 percent in the prior art. The low-temperature activity of the catalyst is good; a good oxynitride removal rate and water-resistant and sulphur-resistant performance can be realized within the temperature range of 130 to 250 DEG C; the catalyst has high activity and toxicity resistance at 130 to 250 DEG C, so that the catalyst can be installed behind a coal-fired boiler dust remover; the defects of the existing smoke gas denitration technology are overcome; the catalyst can also be applied to the smoke gas denitration of industrial kilns and the like.

Description

technical field [0001] The invention relates to a low-temperature SCR flue gas high-efficiency denitrification catalyst and a preparation method thereof, belonging to the technical field of catalyst manufacture. Background technique [0002] Nitrogen oxides (NOx), including NO, NO2, N2O, etc., are the main air pollutants. Nitrogen oxides in the atmosphere can cause acid rain, photochemical smog, the greenhouse effect and the destruction of the ozone layer. It also endangers human health and causes diseases such as bronchitis and pneumonia. 63% of NOx in the atmosphere comes from industrial pollution and traffic pollution, twice that of natural sources, of which emissions from the power industry and automobile exhaust each account for 40%, and other industrial pollution sources account for 20%. [0003] There are 2 methods to reduce NOx emissions, they are combustion process control and flue gas denitrification after combustion. At this stage, it is mainly achieved by cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01J23/002B01D53/8628B01D2258/0283B01J23/30B01J2523/00B01J2523/3712B01J2523/47B01J2523/53B01J2523/55B01J2523/69
Inventor 周焕文童景超王毅
Owner 大连瑞克科技股份有限公司
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