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Green low-temperature denitration catalyst and preparation method thereof

A low-temperature denitration and catalyst technology, which is applied in the field of catalysis, can solve the problems of low-temperature reaction activity of catalysts, etc., and achieve the effect of enhancing surface acidity and strengthening synergistic effect.

Active Publication Date: 2018-09-04
南京南润环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty of low-temperature denitrification technology is that after the flue gas is dedusted and desulfurized, the temperature drops below 150°C, and the low-temperature reaction activity of the catalyst is greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]A preparation method of a green low-temperature denitrification catalyst is realized through the following steps:

[0027] (1) Preparation of PO 4 3- -SO 4 2- / SiO 2 -TiO 2

[0028] Add 0.1 mol ethyl orthosilicate and 0.1 mol n-butyl titanate to 200 mL of absolute ethanol, stir for 20 min to obtain solution A; mix 100 mL of deionized water, 100 mL of absolute ethanol, and 0.008 mol of sulfuric acid with a mass concentration of 98% , 0.02moLCTAB, and 0.005moL phosphoric acid with a mass concentration of 85wt%, stirred at room temperature for 30 minutes to obtain solution B; under vigorous stirring, slowly inject solution A into solution B through a syringe pump, and wait until solution A is injected Afterwards, continue to stir for 2 hours to obtain a uniform sol, place the sol in an oven at 90°C for 12 hours to form a xerogel, then bake the xerogel at 500°C for 5 hours in an air atmosphere, and then grind and sieve to obtain a 40~ 60 mesh PO with mesoporous struct...

Embodiment 2

[0034] A preparation method of a green low-temperature denitrification catalyst is realized through the following steps:

[0035] (1) Preparation of PO 4 3- -SO 4 2- / SiO 2 -TiO 2

[0036] With step (1) in embodiment 1;

[0037] (2) Preparation of ionic liquid precursor MIMPS

[0038] Dissolve 0.1mol of 1,3-propane sultone in 100mL of acetone to obtain solution C, transfer solution C to an ultrasonic reactor with stirring, and pass high-purity nitrogen into the reactor for 90 minutes to drive away the oxygen in it , then turn on the ultrasound to maintain the power of the ultrasonic reactor at 400w, slowly add 0.1mol of N-methylimidazole dropwise to the reactor through a constant pressure dropping funnel, and stir at room temperature for 30min to obtain a white pre-product; The white pre-product was filtered under reduced pressure to obtain a solid, which was washed with ethyl acetate and dried in a vacuum oven at 60°C for 4 hours to obtain MIMPS;

[0039] (3) In situ...

Embodiment 3

[0042] A preparation method of a green low-temperature denitrification catalyst is realized through the following steps:

[0043] (1) Preparation of PO 4 3- -SO 4 2- / SiO 2 -TiO 2

[0044] With step (1) in embodiment 1;

[0045] (2) Preparation of ionic liquid precursor MIMPS

[0046] Dissolve 0.1mol of 1,3-propane sultone in 100mL of acetone to obtain solution C, transfer solution C to an ultrasonic reactor with stirring, and pass high-purity nitrogen into the reactor for 90 minutes to drive away the oxygen in it , then turn on the ultrasound to maintain the power of the ultrasonic reactor at 300w, slowly add 0.1mol of N-methylimidazole dropwise to the reactor through a constant pressure dropping funnel, and stir at room temperature for 30min~90min to obtain a white precursor The product; the white pre-product was filtered under reduced pressure to obtain a solid, which was washed with ethyl acetate and dried in a vacuum oven at 60°C for 4 hours to obtain MIMPS;

[0...

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PUM

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Abstract

The invention discloses a green low-temperature denitration catalyst and a preparation method thereof. The method comprises the following steps: adding ethyl orthosilicate and tetrabutyl titanate to absolute ethyl alcohol to obtain a solution A; mixing deionized water, absolute ethyl alcohol, 98% by mass concentration of sulfuric acid, CTAB and 85wt% by mass concentration of phosphoric acid to obtain a solution B; pouring the solution A into the solution B to obtain uniform sol; drying; roasting; grinding; screening to obtain PO43-SO42- / SiO2-TiO2; dissolving 1,3-propane suhone into acetone toobtain a solution C; dropwise adding N-methylimidazole to obtain a primary white product; performing pressure-reduced suction filtration, washing and drying to obtain 1-(3-sulfonyl)-methyl-3-methylimidazole; dissolving phosphotungstic acid in distilled water; then adding ferric nitrate, 1-(3-sulfonyl)-methyl-3-methylimidazole and PO43-SO42- / SiO2-TiO2 to obtain a solution E; and performing pressure-reduced distilling and drying to obtain the green low-temperature denitration catalyst in which PO43-SO42- / SiO2-TiO2 is used as a carrier, and Fe0.33[MIMPS]2PW12O40 or Fe0.66[MIMPS]2PW12O40 is used as an active component. The catalyst is high in specific area, and high in catalyzing activity and SO2 poisoning resistance within the temperature of 100-300 DEG C.

Description

technical field [0001] The technical field of catalysis of the present invention relates to a denitration catalyst, in particular to a green low-temperature denitration catalyst and a preparation method thereof. Background technique [0002] The emission of nitrogen oxides from coal-fired flue gas has caused serious harm to the environment, and national regulations on its emission control are becoming more and more stringent. NH 3 -SCR technology is widely used as the main technical method for stationary source denitrification, but the vanadium-based catalyst used in it has a narrow reaction temperature window, and the main active component V 2 o 5 High temperature is volatile and toxic, and will easily cause secondary pollution to the environment. At present, SCR technology mostly adopts high dust content arrangement in industrial applications, but the dust and sulfur dioxide in the flue gas can easily poison the catalyst, which in turn affects the service life and catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J31/18B01J31/38B01J37/02B01J37/03B01D53/86B01D53/56
CPCB01D53/8628B01D2255/20707B01D2255/30B01D2255/70B01D2258/0283B01J27/188B01J31/0285B01J31/0292B01J31/38B01J37/0201B01J37/036
Inventor 李俊霞
Owner 南京南润环保科技有限公司
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