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Mn/Co-based low-temperature SCO catalyst and preparation method thereof

A catalyst, low temperature technology, used in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of limited industrial application, poor stability, etc., and achieve good low-temperature denitrification. Activity, avoidance of agglomeration, the effect of structural stability

Active Publication Date: 2017-11-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with porous materials such as molecular sieves, the stability of MOFs materials is relatively poor, which limits their industrial applications.

Method used

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  • Mn/Co-based low-temperature SCO catalyst and preparation method thereof
  • Mn/Co-based low-temperature SCO catalyst and preparation method thereof
  • Mn/Co-based low-temperature SCO catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) 520 μL of 50% Mn(NO 3 ) 2 solution and 1.2gCo(NO 3 ) 3 ·6H 2 O (the molar ratio of manganese and cobalt is 1:1) was added to 50 mL of DMF, 1000 μL of formic acid and 10 μL of water were added, and the solution was fully mixed by magnetic stirring for 30 min to obtain a mixed solution;

[0038] (2) Place the mixed solution in a drying oven at 80°C and react for 20 hours. After the solution is cooled, remove the supernatant, add fresh DMF, soak and activate at room temperature for 12 hours, and obtain an activated crystal material (Mn / Co-MOF1);

[0039] (3) The activated crystal material is impregnated with DMF, washed and purified, filtered, and the filtered solid material is placed in a vacuum oven at 50°C for drying;

[0040] (4) The dried solid material was put into a muffle furnace and calcined at 300 °C for 2 h to prepare a Mn-based low-temperature SCO catalyst (denoted as Mn / Co-CAT1).

Embodiment 2

[0042] (1) 520 μL of 50% Mn(NO 3 ) 2 solution and 0.64gCo(NO 3 ) 3 ·6H 2 O (the molar ratio of manganese and cobalt is 1:0.5) was added to 50 mL of DMF, 1200 μL of formic acid and 30 μL of water were added, and the solution was fully mixed by magnetic stirring for 30 min to obtain a mixed solution;

[0043] (2) Place the mixed solution in a drying oven at 100°C and react for 24 hours. After the solution is cooled, remove the supernatant, add fresh DMF, soak and activate at room temperature for 18 hours, and obtain an activated crystal material (Mn / Co-MOF2);

[0044] (3) The activated crystalline material is impregnated with DMF, washed and purified, filtered, and the solid material obtained after filtering is placed in a vacuum drying oven at 80° C. for drying;

[0045] (4) The dried solid material was put into a muffle furnace and calcined at 350° C. for 2.5 h to prepare a Mn-based low-temperature SCO catalyst (denoted as Mn / Co-CAT2).

Embodiment 3

[0047] (1) 520 μL of 50% Mn(NO 3 ) 2 solution and 2.40gCo(NO 3 ) 3 ·6H 2 O (the molar ratio of manganese and cobalt is 1:2) was added to 50 mL of DMF, 1500 μL of formic acid and 50 μL of water were added, and the solution was fully mixed by magnetic stirring for 30 min to obtain a mixed solution;

[0048] (2) Place the mixed solution in a drying oven at 120°C and react for 30 hours. After the solution is cooled, remove the supernatant, add fresh DMF, soak and activate at room temperature for 24 hours, and obtain an activated crystal material (Mn / Co-MOF3);

[0049] (3) The activated crystal material is impregnated with DMF, washed and purified, filtered, and the filtered solid material is dried in a vacuum oven at 100°C;

[0050] (4) The dried solid material was put into a muffle furnace and calcined at 400°C for 3.0 h to prepare a Mn-based low-temperature SCO catalyst (denoted as Mn / Co-CAT3).

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Abstract

The invention discloses a Mn / Co-based low-temperature SOC catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving manganese-containing metal salt and cobalt-containing metal salt in dimethylformamide, adding an organic ligand and water, and magnetically stirring and uniformly mixing the components to obtain a mixed solution; and (2) carrying out hydrothermal reaction on the obtained mixed solution in a reactor, reacting to obtain Mn / Co double-metal organic framework crystal, soaking the Mn / Co double-metal organic framework crystal in the dimethylformamide and activating the Mn / Co double-metal organic framework crystal, and then purifying, filtering and roasting the activated crystal to obtain the Mn / Co-based low-temperature SCO catalyst. The Mn / Co-based low-temperature SCO catalyst has good low-temperature denitration activity. Compared with an existing low-temperature denitration catalyst, the Mn / Co-based low-temperature SOC catalyst has the advantages that the conversion rate of catalyzed NO is greatly increased, at the low temperature of 150-200 DEG C, the catalyzed conversion rate of NO can reach 50% or above, and existing industrial requirements can be met.

Description

technical field [0001] The invention relates to the technical field of NOx removal, in particular to a Mn / Co-based low-temperature SCO catalyst for removing NOx and a preparation method thereof. Background technique [0002] With the rapid development of modern industry, air pollutants NOx (NO, N 2 o 3 , NO 2 , N 2 o 4 ) content has been increasing year by year, which has aroused widespread concern. The increase of NOx in the air will bring a series of environmental problems, including smog, acid rain, and photochemical smog that seriously harms the human body. The generation of NOx mainly comes from the flue gas of various chemical enterprises that use fossil fuels such as coal to provide energy and power, including thermal power plants, ceramic factories, cement factories, etc. Therefore, reducing the emission of NOx in factory exhaust gas has become the primary issue for controlling air pollution. [0003] The mainstream technology for flue gas treatment in the wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01J23/8892
Inventor 夏启斌赵长多范美玲吕道飞陈永伟
Owner SOUTH CHINA UNIV OF TECH
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