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Hydroxyl-containing manganese-series catalyst used for low-temperature flue gas denitration and preparation method thereof

A hydroxy manganese-based, low-temperature flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor selectivity and poor sulfur resistance , to achieve the effect of convenient operation, simple process and good anti-sulfur poisoning performance

Inactive Publication Date: 2017-03-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Industry demand for low-temperature denitrification catalysts and the presence of N in manganese-based catalysts 2 Insufficiency of poor selectivity and poor anti-sulfur performance, the present invention uses dicarboxylic acid as template agent, metal chloride salt as ligand, methanol as complexing aid and solvent, and piperidine as proton and chloride ion trapping agent, through esterification reaction and metal ion complexation to prepare a hydroxyl-containing manganese catalyst for NH 3 –SCR denitrification

Method used

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  • Hydroxyl-containing manganese-series catalyst used for low-temperature flue gas denitration and preparation method thereof
  • Hydroxyl-containing manganese-series catalyst used for low-temperature flue gas denitration and preparation method thereof
  • Hydroxyl-containing manganese-series catalyst used for low-temperature flue gas denitration and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (a) Accurately weigh 11.874g of manganese dichloride tetrahydrate and 4.380g of adipic acid, dissolve them in 120mL methanol solution together, stir well, and prepare solution A;

[0028] (b) Accurately measure 15mL of piperidine solution, add dropwise to 105mL of methanol solution, stir evenly, and prepare solution B;

[0029] (c) rapidly stirring the solution A in the step (a), during which, the solution B of the step (b) is slowly added dropwise to the rapidly stirring solution (a), until the reaction is complete, and a precipitate C is formed;

[0030] (d) Seal and age the mixed solution containing precipitate C in step (c) at room temperature for 12 hours, filter the precipitate, wash with excess methanol, and dry in vacuum at 65°C for 12 hours; FTIR spectrum of the dried sample Figure and XRD spectrum as attached figure 2 And attached image 3 ;

[0031] (e) Place the dried sample in step (d) in a muffle furnace, set the calcination temperature to 550°C, and s...

Embodiment 2

[0036](a) Accurately weigh 11.874g of manganese dichloride tetrahydrate, 4.754g nickel dichloride hexahydrate and 4.380g of adipic acid, dissolve in 120mL methanol solution together, stir well, and be mixed with solution A;

[0037] (b) Accurately measure 15mL of piperidine solution, add dropwise to 105mL of methanol solution, stir evenly, and prepare solution B;

[0038] (c) rapidly stirring the solution A in the step (a), during which, the solution B of the step (b) is slowly added dropwise to the rapidly stirring solution (a), until the reaction is complete, and a precipitate C is formed;

[0039] (d) Seal and age the mixed solution containing precipitate C in step (c) at room temperature for 12 hours, filter to obtain the precipitate, wash with excess methanol, and vacuum-dry at 65°C for 12 hours; FTIR spectrum of the dried sample The picture is attached figure 2 ;

[0040] (e) Place the dried sample in step (d) in a muffle furnace, set the calcination temperature to 55...

Embodiment 3

[0045] (a) Accurately weigh 11.874g of manganese dichloride tetrahydrate, 4.758g of cobalt dichloride hexahydrate and 4.380g of adipic acid, dissolve them in 120mL methanol solution together, stir well, and prepare solution A;

[0046] (b) Accurately measure 15mL of piperidine solution, add dropwise to 105mL of methanol solution, stir evenly, and prepare solution B;

[0047] (c) rapidly stirring the solution A in the step (a), during which, the solution B of the step (b) is slowly added dropwise to the rapidly stirring solution (a), until the reaction is complete, and a precipitate C is formed;

[0048] (d) Seal and age the mixed solution containing precipitate C in step (c) at room temperature for 12 hours, filter to obtain the precipitate, wash with excess methanol, and vacuum-dry at 65°C for 12 hours; FTIR spectrum of the dried sample The picture is attached figure 2 ;

[0049] (e) Place the dried sample in step (d) in a muffle furnace, set the calcination temperature to...

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Abstract

The invention provides a hydroxyl-containing manganese-series catalyst used for low-temperature flue gas denitration and a preparation method thereof, belonging to the field of flue gas denitration and environmental catalysis. According to the invention, dicarboxylic acid is used as a template agent; a metal chloride is used as ligand; methanol is used as a complexation aid and a solvent; piperidine is used as a proton and chloride ion capturing agent; and the hydroxyl-containing manganese-series catalyst is prepared through an esterification reaction and metal ion complexation, and is applicable to NH3-SCR denitration. The dicarboxylic acid comprises one selected from a group consisting of oxalic acid and propane diacid to dodecanedioic acid, i.e., HOOC-(CH2)n-COOH (wherein n is no less than 0 and no more than 10). The hydroxyl-containing manganese-series catalyst has high low-temperature nitrogen oxide (NOx) purifying effect and good nitrogen (N2) selectivity, wherein the removal rate of NOx in a temperature range of 150 to 250 DEG C is as high as 80 to 100% and the selectivity of N2 reaches 75% or above; and the catalyst has certain resistance to SO2 poisoning. The method is easy to operate, simple in process and convenient for realization of industrial production. The prepared catalyst is applicable to removal of nitrogen oxides in low-temperature flue gas from coal-fired power plants, industrial kilns, pellet sintering, the coking industry, etc.

Description

technical field [0001] The invention relates to a hydroxyl-containing manganese catalyst used for low-temperature flue gas denitrification and a preparation method thereof. The catalyst is suitable for the removal of nitrogen oxides (NOx) in low-temperature flue gas of coal-fired power plants, industrial kilns, sintering pellets, coking industries, etc., and belongs to the field of flue gas denitrification and environmental catalysis. Background technique [0002] As one of the main air pollutants, nitrogen oxides (NOx) can cause acid rain, photochemical smog, ozone layer destruction, etc., causing certain damage to the ecological environment and human health, and it is also one of the important precursors leading to the formation of smog . In 2014, my country's NOx emissions were about 20.78 million tons, of which 67.6% came from industrial stationary sources. Ammonia selective catalytic reduction technology (NH 3 –SCR) is a relatively mature flue gas denitrification tec...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/75B01J23/755B01D53/86B01D53/56
CPCB01D53/8628B01D2258/06B01J23/34B01J23/75B01J23/755Y02P20/30
Inventor 唐晓龙高凤雨易红宏赵顺征孟婧轩
Owner UNIV OF SCI & TECH BEIJING
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