Flat plate type SCR denitration catalyst for high-temperature flue gas and preparation method thereof

Abstract

The embodiment of the invention provides a flat plate type SCR denitration catalyst for high-temperature flue gas and a preparation method thereof. The catalyst is prepared by taking TiO2-Y2O3-gamma-Al2O3 composite nano oxide as a carrier, tungsten trioxide as an active component and cerous sulfate as an active auxiliary agent, adding a structural auxiliary agent consisting of organic and inorganic components and carrying out a rolling coating process. According to the catalyst, the high-temperature denitration performance is improved by developing a carrier with high thermal stability and high specific surface area, optimizing active components and active aids, optimizing a preparation process and the like so that the catalyst has excellent denitration activity and thermal stability within a temperature range of 500-750 DEG C. The glass fibers in the structural auxiliary agent can obviously improve the adhesion performance of the flat plate type catalyst, the montmorillonite can significantly improve the wear resistance of the catalyst, and the Al2O3 component contained in the carrier can also significantly improve the wear resistance of the catalyst so that the catalyst has goodmechanical properties, the replacement frequency of the catalyst is reduced, and the operation cost of SCR denitration is saved.

Description

technical field

[0001] The invention belongs to the technical fields of environmental protection technology and denitrification catalysis, and in particular relates to a flat-plate SCR denitrification catalyst for high-temperature flue gas. The invention also provides a preparation method of the flat-plate SCR denitration catalyst for high-temperature flue gas. Background technique

[0002] In recent years, the country's attention to environmental pollution has gradually increased, and policies and indicators for the discharge of various pollutants in different industries have been promulgated one after another. NO as one of the main pollutants emitted by industrial boilers x It can cause photochemical smog, acid rain, greenhouse effect, ozone layer destruction and many other environmental problems, so NO x Emissions have already been regulated by the state.

[0003] SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) denitrification technology is currently...

Examples

preparation example Construction

[0033] In order to better realize the above-mentioned technical scheme, the present invention also provides a preparation method of a flat-plate SCR denitration catalyst for high-temperature flue gas, and the specific steps include:

[0034] S1. TiO 2 -Y 2 o 3 -γ-Al 2 o 3 Preparation of Composite Nanocarriers

[0035] Dissolve titanium tetrachloride in water at 10°C to obtain a titanium tetrachloride solution, add monoglyceride stearate into the titanium tetrachloride solution and stir evenly, and adjust the pH value of the solution to 6.5-7.5 with ammonia water with a volume concentration of 30%. , heat the solution to 50°C to hydrolyze titanium to obtain a uniform white emulsion; add acetic acid solution of yttrium nitrate and aluminum trichloride solution to the solution in turn, stir evenly, adjust the pH value of the solution to 9-10 with ammonia water, and then Stir continuously at 85°C for 2 to 4 hours; filter to obtain the hydrolyzed precipitate, wash it with etha...

Embodiment 1

[0045] This embodiment provides a flat-plate SCR denitration catalyst for high-temperature flue gas and its preparation method. The specific steps include:

[0046] (1) TiO 2 -Y 2 o 3 -γ-Al 2 o 3 Preparation of Composite Nanocarriers

[0047] Dissolve 1896.8g titanium tetrachloride with 20L water respectively, 295mL water dissolve 169.64g yttrium nitrate hexahydrate and 0.89g acetic acid, 1.96L water dissolve 392.18g aluminum trichloride, obtain titanium solution, yttrium solution and aluminum solution; Add 38.1g of monoglyceride stearate to the solution, adjust the pH value of the solution to 6.5 with ammonia water, and then heat the solution to 50°C to hydrolyze the titanium solution to obtain a uniform white emulsion; add the yttrium solution and the aluminum solution to the emulsion in turn, Adjust the pH value of the solution to 9, heat the solution to 85°C and continue to stir for 2h; filter to obtain a hydrolyzed precipitate, wash with ethanol and deionized water, ...

Embodiment 2

[0054] Example 2 also describes a flat-plate SCR denitration catalyst for high-temperature flue gas and its preparation method. The specific steps include:

[0055] (1) TiO 2 -Y 2 o 3 -γ-Al 2 o 3 Preparation of Composite Nanocarriers

[0056] Dissolve 1896.8g titanium tetrachloride with 20L water respectively, dissolve 509.47g yttrium nitrate hexahydrate and 2.67g acetic acid with 887mL water, dissolve 130.67g aluminum trichloride with 327mL water, obtain titanium solution, yttrium solution and aluminum solution; Add 107.57g of monoglyceride stearate, adjust the pH value of the solution to 7.5 with ammonia water, and then heat the solution to 50°C to hydrolyze the titanium solution to obtain a uniform white emulsion; add the yttrium solution and aluminum solution to the emulsion in turn, adjust The pH value of the solution was 10, heated the solution to 85°C and continued to stir for 4h; filtered to obtain a hydrolyzed precipitate, washed with ethanol and deionized water,...

technical field

[0001] The invention belongs to the technical fields of environmental protection technology and denitrification catalysis, and in particular relates to a flat-plate SCR denitrification catalyst for high-temperature flue gas. The invention also provides a preparation method of the flat-plate SCR denitration catalyst for high-temperature flue gas. Background technique

[0002] In recent years, the country's attention to environmental pollution has gradually increased, and policies and indicators for the discharge of various pollutants in different industries have been promulgated one after another. NO as one of the main pollutants emitted by industrial boilers x It can cause photochemical smog, acid rain, greenhouse effect, ozone layer destruction and many other environmental problems, so NO x Emissions have already been regulated by the state.

[0003] SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) denitrification technology is currently...

Examples

preparation example Construction

[0033] In order to better realize the above-mentioned technical scheme, the present invention also provides a preparation method of a flat-plate SCR denitration catalyst for high-temperature flue gas, and the specific steps include:

[0034] S1. TiO 2 -Y 2 o 3 -γ-Al 2 o 3 Preparation of Composite Nanocarriers

[0035] Dissolve titanium tetrachloride in water at 10°C to obtain a titanium tetrachloride solution, add monoglyceride stearate into the titanium tetrachloride solution and stir evenly, and adjust the pH value of the solution to 6.5-7.5 with ammonia water with a volume concentration of 30%. , heat the solution to 50°C to hydrolyze titanium to obtain a uniform white emulsion; add acetic acid solution of yttrium nitrate and aluminum trichloride solution to the solution in turn, stir evenly, adjust the pH value of the solution to 9-10 with ammonia water, and then Stir continuously at 85°C for 2 to 4 hours; filter to obtain the hydrolyzed precipitate, wash it with etha...

Embodiment 1

[0045] This embodiment provides a flat-plate SCR denitration catalyst for high-temperature flue gas and its preparation method. The specific steps include:

[0046] (1) TiO 2 -Y 2 o 3 -γ-Al 2 o 3 Preparation of Composite Nanocarriers

[0047] Dissolve 1896.8g titanium tetrachloride with 20L water respectively, 295mL water dissolve 169.64g yttrium nitrate hexahydrate and 0.89g acetic acid, 1.96L water dissolve 392.18g aluminum trichloride, obtain titanium solution, yttrium solution and aluminum solution; Add 38.1g of monoglyceride stearate to the solution, adjust the pH value of the solution to 6.5 with ammonia water, and then heat the solution to 50°C to hydrolyze the titanium solution to obtain a uniform white emulsion; add the yttrium solution and the aluminum solution to the emulsion in turn, Adjust the pH value of the solution to 9, heat the solution to 85°C and continue to stir for 2h; filter to obtain a hydrolyzed precipitate, wash with ethanol and deionized water, ...

Embodiment 2

[0054] Example 2 also describes a flat-plate SCR denitration catalyst for high-temperature flue gas and its preparation method. The specific steps include:

[0055] (1) TiO 2 -Y 2 o 3 -γ-Al 2 o 3 Preparation of Composite Nanocarriers

[0056] Dissolve 1896.8g titanium tetrachloride with 20L water respectively, dissolve 509.47g yttrium nitrate hexahydrate and 2.67g acetic acid with 887mL water, dissolve 130.67g aluminum trichloride with 327mL water, obtain titanium solution, yttrium solution and aluminum solution; Add 107.57g of monoglyceride stearate, adjust the pH value of the solution to 7.5 with ammonia water, and then heat the solution to 50°C to hydrolyze the titanium solution to obtain a uniform white emulsion; add the yttrium solution and aluminum solution to the emulsion in turn, adjust The pH value of the solution was 10, heated the solution to 85°C and continued to stir for 4h; filtered to obtain a hydrolyzed precipitate, washed with ethanol and deionized water,...

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