A modified low-temperature SCO denitration catalyst and its preparation method

A denitrification catalyst and low-temperature technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor stability of MOFs materials, achieve cheap raw materials, promote catalytic oxidation reactions, and easily obtain raw materials Effect

Active Publication Date: 2021-02-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of MOFs materials is relatively poor. In order to solve this problem, some scholars have carried out high-temperature carbonization of MOFs materials to prepare functional and stable nanoporous carbon materials.

Method used

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  • A modified low-temperature SCO denitration catalyst and its preparation method
  • A modified low-temperature SCO denitration catalyst and its preparation method
  • A modified low-temperature SCO denitration catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation of low-temperature SCO denitration catalyst comprises the following steps:

[0042] (1) Mn(NO 3 ) 2 4H 2O(0.852g, 3.4mol), Co(NO 3 ) 2 ·6H 2 O (1.0g, 3.4mol) and Ce (NO 3 ) 2 ·6H 2 O (0.037g, 0.085mol) (the molar ratio of manganese and cobalt is 1:1, and the molar ratio of manganese and cerium is 1:0.025) is added in the DMF of 50mL, adds isonicotinic acid (0.384g, 3.1mol), Ultrasound for 20 minutes to fully mix the solution to obtain a mixed solution;

[0043] (2) Put the mixed solution in a 90°C drying oven and react for 20 hours. After the solution is cooled, remove the supernatant, wash with fresh DMF and ether three times, filter, and place the filtered solid material in a vacuum at 50°C. Dry in a drying box for 24 hours;

[0044] (3) The dried solid material was put into a muffle furnace and roasted at 300° C. for 2 h to prepare a low-temperature SCO denitration catalyst (referred to as Mn-CAT).

Embodiment 2

[0046] The preparation of the modified low-temperature SCO denitration catalyst comprises the following steps:

[0047] (1) Mn(NO 3 ) 2 4H 2 O(0.852g, 3.4mol), Co(NO 3 ) 2 ·6H 2 O (2g, 6.8mol) and Ce (NO 3 ) 2 ·6H 2 O (0.037g, 0.085mol) (the molar ratio of manganese and cobalt is 1:2, and the molar ratio of manganese and cerium is 1:0.025) is added in the DMF of 50mL, adds isonicotinic acid (0.192g, 1.56mol), Ultrasound for 30 minutes to fully mix the solution to obtain a mixed solution;

[0048] (2) Put the mixed solution in a 100°C drying oven and react for 24 hours. After the solution is cooled, remove the supernatant, wash with fresh DMF and ether for 4 times, filter, and place the filtered solid material in a vacuum at 60°C. Dry in a drying box for 20 hours;

[0049] (3) Put the dried solid material into a muffle furnace and roast at 350° C. for 2.5 hours to prepare a low-temperature SCO denitration catalyst (referred to as Mn-CAT).

[0050] (4) Put the prepare...

Embodiment 3

[0052] The preparation of the modified low-temperature SCO denitration catalyst comprises the following steps:

[0053] (1) Mn(NO 3 ) 2 4H 2 O(0.852g, 3.4mol), Co(NO 3 ) 2 ·6H 2 O (0.5g, 1.7mol) and Ce (NO 3 ) 2 ·6H 2 O (0.015g, 0.034mol) (the molar ratio of manganese and cobalt is 1:0.5, and the molar ratio of manganese and cerium is 1:0.01) is added in 50mL of DMF, isonicotinic acid (0.768g, 6.2mol) is added, Ultrasound for 40 minutes to fully mix the solution to obtain a mixed solution;

[0054] (2) Put the mixed solution in a 110°C drying oven and react for 30 hours. After the solution is cooled, remove the supernatant, wash with fresh DMF and ether for 5 times, filter, and place the filtered solid material in a vacuum at 75°C. Dry in a drying box for 22 hours;

[0055] (3) The dried solid material was put into a muffle furnace and roasted at 400° C. for 3 h to prepare a low-temperature SCO denitration catalyst (referred to as Mn-CAT).

[0056] (4) Put the prepa...

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Abstract

The invention discloses a modified low-temperature SCO denitration catalyst and a preparation method thereof. The preparation method comprises: (1) dissolving manganese nitrate, cobalt nitrate and cerium nitrate in dimethylformamide, adding an organic ligand, and ultrasonicating until the solution is evenly mixed; (2) heating the mixed solution obtained in step (1), Hydrothermal reaction to obtain Mn/Co/Ce mixed multi-metal organic framework crystal material; the prepared crystal material is washed, filtered, dried and roasted in sequence to obtain low-temperature SCO denitration catalyst; (3) Ultrasonic impregnation of low-temperature SCO with modified solution The denitration catalyst is taken out and dried to obtain the modified low-temperature SCO denitration catalyst. The modified low-temperature SCO denitrification catalyst of the present invention has a NO conversion rate of 62.41% at 100°C. Compared with the SCO denitrification catalyst before modification, the activity has increased by 40.05%, which can better meet the current industrial requirements. The field of low-temperature denitrification has great potential application prospects.

Description

technical field [0001] The invention relates to the technical field of NOx removal, in particular to a low-temperature SCO denitration catalyst for removing NOx and a preparation method thereof. Background technique [0002] At this stage, the control of nitrogen oxide emissions in non-power industries has encountered great difficulties. This is because the discharge temperature of flue gas from industrial boiler (kiln) furnace equipment in the non-power industry (for example: industrial boilers, glass ceramic furnaces, cement furnaces, iron and steel metallurgy sintering furnaces, cracking equipment for coking and petrochemical systems, etc.) In the range of 120°C to 250°C, the SCR (Selective Catalytic Reduction) denitrification catalyst commonly used in the power industry currently operates at a temperature of 300°C to 400°C, which is difficult to directly use in the control of nitrogen oxide emissions in non-power industries. Therefore, finding an efficient low-temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J37/10B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/8892B01J37/084B01J37/086B01J37/10B01J2523/00B01J2523/3712B01J2523/72B01J2523/845B01J2523/12B01J2523/13
Inventor 夏启斌赵长多吴坚范美玲
Owner SOUTH CHINA UNIV OF TECH
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