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Novel low-temperature denitration catalyst and preparation method thereof

A low-temperature denitration and catalyst technology, applied in the field of catalysis, can solve the problems of low-temperature reaction activity of catalysts, etc., and achieve the effects of improving anti-poisoning performance, strengthening synergistic effect, and resisting sulfation

Active Publication Date: 2018-08-14
JIANGSU SANJI IND
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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 novel low-temperature denitration catalyst is realized through the following steps:

[0027] (1) Preparation of tin-titanium solid solution

[0028] Add 0.1moL tetrabutyl titanate to 200mL absolute ethanol, stir for 30min to obtain solution A; mix 100mL deionized water, 100mL absolute ethanol, 0.008moL sulfuric acid with a mass concentration of 98%, 0.015moL CTAB and 0.1mol tetra Mix tin chloride and stir at room temperature for 30 minutes to obtain solution B; under the condition of vigorous stirring, slowly inject solution A into solution B through a syringe pump. After solution A is injected, continue stirring for 2 hours to obtain a uniform sol. Dry the sol in an oven at 90°C for 12 hours to form a xerogel, then bake the xerogel at 500°C in an air atmosphere for 5 hours, and then grind and sieve to obtain a 40-60 mesh tin-titanium solid solution with a mesoporous structure ;

[0029] (2) Preparation of ionic liquid precursor MIMPS

[003...

Embodiment 2

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

[0035] (1) Preparation of tin-titanium solid solution

[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 loading of i...

Embodiment 3

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

[0043] (1) Preparation of tin-titanium solid solution

[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;

[0047] (3) In s...

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PUM

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Abstract

The invention discloses a novel low-temperature denitration catalyst and a preparation method thereof. The method comprises the following steps of adding tetrabutyl titanate into absolute ethyl alcohol to obtain a solution A; mixing deionized water, absolute ethyl alcohol, sulfuric acid with the mass concentration being 98 percent, CTAB and tin tetrachloride to obtain a solution B; injecting the solution A into the solution B to obtain uniform sol; performing drying, roasting and grinding sieving to obtain tin titanium sosoloid; dissolving 1,3-propane suhone into acetone to obtain a solution C; dripping N-methylimidazole to obtain white pre-products; performing reduced pressure suction filtering, washing and drying to obtain 1-(3-sulfo)propyl-3-methylimidazole; dissolving phosphotungstic acid into distilled water; then, adding cerous nitrate, 1-(3-sulfo)propyl-3-methylimidazole and tin titanium sosoloid to obtain a solution E; performing reduced pressure distillation and drying to obtain the novel denitration catalyst using SO4<2-> / TiO2-SnO2 as carriers, using Ce0.33[MIMPS]2PW12O40 or Ce0.66[MIMPS]2PW12O40 as active ingredients. The catalyst has higher specific surface area, and can realize high catalysis activity and SO2 poisoning resistant performance in a range of 80 to 200 DEG C.

Description

technical field [0001] The technical field of catalysis of the present invention relates to a denitration catalyst, in particular to a novel 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): B01J31/38B01J27/188B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J27/188B01J31/38B01D2258/0283B01J35/61
Inventor 李俊霞
Owner JIANGSU SANJI IND
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