MnOx-FeOx-CuSO4/TiO2 medium-low temperature SCR catalyst and preparation method thereof

An SCR catalyst, mnox-feox-cuso4 technology, applied in the field of denitration catalyst, can solve the problems of pollution, toxicity, restrict the development of nitrogen oxide emission reduction work, etc., to achieve the effect of increasing the specific surface area and facilitating the adsorption capacity

Inactive Publication Date: 2018-04-20

SHENZHEN JINGTE INTELLIGENT MFG TECH CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

The most widely used commercially today is the V 2 o 5 /TiO 2 It is a catalyst, its denitrification rate can reach more than 90% in industrial application, but it is only limited to the high temperature activity window (≥350°C), and V 2 o 5 Toxic, will produce pollution during production, use and disposal

[0004] At present, the low-temperature SCR denitrification catalyst widely ...

Method used

Test result as shown in Figure 1, prepared SCR catalyst in each embodiment reaches 60%-96% NO removal rate between 200~300 ℃, has higher denitrification activity, wherein embodiment 5 catalyst The denitrification activity is optimal, reaching 80%-96% at 200-300°C, which is close to the commercial high...

Abstract

The invention discloses an MnOx-FeOx-CuSO4/TiO2 medium-low temperature SCR catalyst and a preparation method thereof. The preparation method comprises the following steps of: (1) mixing hexadecyl trimethyl ammonium bromide, tetrabutyl titanate and anhydrous ethanol, and adjusting the pH value of the mixed solution with glacial acetic acid to prepare a Ti precursor sol; (2) adding the prepared Ti precursor sol into CuSO4.5H2O, continuing to adjust the pH value of the obtained solution with glacial acetic acid, and performing stirring under the protection of nitrogen to obtain a main active substance load; and (3) adding Mn(Ac)2.4H2O, Fe(NO3)3.9H2O and deionized water into the main active substance load sequentially, continuing to stir the obtained mixed liquid, then aging the mixed liquid in a water bath, and performing drying and calcining to obtain the finished catalyst product. The SCR catalyst prepared by using the preparation method has high activity of denitration at medium-low temperatures of 200-350 DEG C, can adapt to requirements of practical industrial application, and has a very broad prospect of industrial application.

Application Domain

Gas treatmentPhysical/chemical process catalysts +1

Technology Topic

Nitrogen gasNitrogen +9

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Examples

Experimental program(5)
Effect test(1)

Example Embodiment

[0024] Example 1:

[0025] (1) Ingredients by weight percentage: 0.1kg cetyltrimethylammonium bromide, 0.6kg tetrabutyl titanate, 6.8kg anhydrous ethanol, CuSO 4 ·5H 2 O 0.4kg, Mn(Ac) 2 ·4H 2 O 0.5kg, Fe(NO 3 ) 3 ·9H 2 O 0.1kg, deionized water 1.5kg;

[0026] (2) After mixing cetyltrimethylammonium bromide, tetrabutyl titanate, and absolute ethanol, adjust the pH of the solution to 5 with glacial acetic acid, and then vigorously stir the above mixture for 1 hour to prepare a Ti precursor sol ;

[0027] (3) Put CuSO 4 ·5H 2 O was added to the Ti precursor sol in step (2) and stirred, and the pH of the solution was adjusted to 4 with glacial acetic acid, and then fully stirred for 2 hours under the protection of nitrogen to prepare CuSO 4 /Ti precursor sol;

[0028] (4) Mn(Ac) 2 ·4H 2 O, Fe(NO 3 ) 3 ·9H 2 O. Deionized water was added to the product of step (3) in sequence, and stirring was continued for 2 hours under the protection of nitrogen. The resulting mixture was poured into a beaker and sealed, and then aged for 12 hours at a water bath temperature of 30°C;

[0029] (5) Dry the sample aged in step (4) in a vacuum drying oven at a temperature of 110°C for 36 hours, and then put it into a nitrogen atmosphere furnace for roasting. The roasting temperature range is: from room temperature to 300°C at 3°C/min , Keep for 2 hours; then increase to 500℃ at 5℃/min, keep for 2 hours;

[0030] (6) Grind the sample calcined in step (5) to obtain a catalyst product.

Example Embodiment

[0031] Example 2:

[0032] (1) Ingredients in percentage by weight: 0.5kg cetyltrimethylammonium bromide, 8kg tetrabutyl titanate, 63 kg anhydrous ethanol, CuSO 4 ·5H 2 O 5kg, Mn(Ac) 2 ·4H 2 O 2kg, Fe(NO 3 ) 3 ·9H 2 O 1.5kg, deionized water 20kg;

[0033] (2) After mixing cetyltrimethylammonium bromide, tetrabutyl titanate, and absolute ethanol, adjust the pH of the solution to 5 with glacial acetic acid, and then vigorously stir the above mixture for 1.5 hours to prepare a Ti precursor Sol

[0034] (3) Put CuSO 4 ·5H 2 O was added to the Ti precursor sol in step (2) and stirred, and the pH of the solution was adjusted to 4 with glacial acetic acid, and then fully stirred for 3 hours under the protection of nitrogen to prepare CuSO 4 /Ti precursor sol;

[0035] (4) Mn(Ac) 2 ·4H 2 O, Fe(NO 3 ) 3 ·9H 2 O. Deionized water was added to the product of step (3) in sequence, and stirring was continued for 3 hours under the protection of nitrogen. The resulting mixture was poured into a beaker and sealed, and then aged for 15 hours at a water bath temperature of 35°C;

[0036] (5) Dry the sample aged in step (4) in a vacuum drying oven at a temperature of 120°C for 30 hours, and then put it into a nitrogen atmosphere furnace for roasting. The roasting temperature range is: from room temperature to 300°C at 3°C/min , Keep for 2 hours; then increase to 500℃ at 5℃/min, keep for 2.5h;

[0037] (6) Grind the sample calcined in step (5) to obtain a catalyst product.

Example Embodiment

[0038] Example 3:

[0039] (1) Ingredients in percentage by weight: 1.5 kg of cetyl trimethyl ammonium bromide, 10 kg of tetrabutyl titanate, 52.5 kg of absolute ethanol, CuSO 4 ·5H 2 O 6kg, Mn(Ac) 2 ·4H 2 O 3kg, Fe(NO 3 ) 3 ·9H 2 O 2kg, deionized water 25kg;

[0040] (2) After mixing cetyltrimethylammonium bromide, tetrabutyl titanate, and absolute ethanol, adjust the pH of the solution to 5 with glacial acetic acid, and then vigorously stir the above mixture for 2 hours to prepare a Ti precursor sol ;

[0041] (3) Put CuSO 4 ·5H 2 O was added to the Ti precursor sol in step (2) and stirred, and the pH of the solution was adjusted to 4 with glacial acetic acid, and then fully stirred for 3 hours under the protection of nitrogen to prepare CuSO 4 /Ti precursor sol;

[0042] (4) Mn(Ac) 2 ·4H 2 O, Fe(NO 3 ) 3 ·9H 2 O, deionized water was added to the product of step (3) in sequence, and stirring was continued for 4 hours under the protection of nitrogen. The resulting mixture was poured into a beaker and sealed, and then aged for 12 hours at a water bath temperature of 40°C;

[0043] (5) Dry the sample aged in step (4) in a vacuum drying oven at a temperature of 130°C for 24 hours, and then put it in a nitrogen atmosphere furnace for roasting. The roasting temperature range is: from room temperature to 300°C at 3°C/min , Keep for 2 hours; then increase to 500℃ at 5℃/min, keep for 3h;

[0044] (6) Grind the sample calcined in step (5) to obtain a catalyst product.

PUM

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