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Low-cost NH3-SCR denitration catalyst and preparing method thereof

A technology of NH3-SCR and denitrification catalyst, applied in the field of catalysis, can solve the problems of high production cost, achieve low cost, suppress sublimation, and enhance the effect of sulfur resistance

Inactive Publication Date: 2019-03-01
李俊霞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core of SCR technology is the catalyst. At present, this type of catalyst is mainly anatase TiO 2 as carrier, with MoO 3 or WO 3 Modified V 2 o 5 Is the active ingredient, but its production cost is higher

Method used

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  • Low-cost NH3-SCR denitration catalyst and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Pretreatment of honeycomb stone: After crushing the honeycomb stone, sieve the 100~120 mesh sample, disperse it in the nitric acid solution with a pH value of 4, treat it under the stirring condition of 500r / min at room temperature for 30min, and then wash it Until the pH value of the filtrate is close to neutral, dry the product at 105°C for 12 hours; wherein the mass volume ratio of honeycomb to nitric acid solution is 10g / 100mL;

[0029] 2) Surface modification of honeycomb: Dissolve CTAB and PVA in deionized water, stir at room temperature for 30 minutes, then add NaOH and continue stirring for 10 minutes, then add tetraethyl orthosilicate (TEOS) and titanium dropwise tetrabutyl ester (TBT), and the pretreated honeycomb obtained in step 1) was added to it, and then the stirring was continued for 3 hours, and the resulting mixture was transferred to a hydrothermal reaction kettle for crystallization treatment at 120°C for 18 hours, and the obtained The precipitate...

Embodiment 2

[0032] 1) Pretreatment of honeycomb stone: crush the honeycomb stone and sieve the 100~120 mesh sample, disperse it in the nitric acid solution with a pH value of 4, treat it under the stirring condition of 300r / min at room temperature for 40min, and then wash it Until the pH value of the filtrate is close to neutral, dry the product at 100°C for 15 hours; wherein the mass volume ratio of honeycomb to nitric acid solution is 20g / 100mL;

[0033] 2) Surface modification of honeycomb: Dissolve CTAB and PVA in deionized water, stir at room temperature for 25 minutes, then add NaOH and continue stirring for 10 minutes, then add tetraethyl orthosilicate (TEOS) and titanium dropwise Add tetrabutyl ester (TBT) to it, and add the pretreated honeycomb obtained in step (1), then continue to stir for 3 hours, and transfer the resulting mixture to a hydrothermal reaction kettle for crystallization treatment at 115°C for 20 hours; Wash the obtained precipitate with deionized water to neutra...

Embodiment 3

[0036] 1) Pretreatment of honeycomb stone: After crushing the honeycomb stone, sieve the 100~120 mesh sample, disperse it in the nitric acid solution with a pH value of 4, treat it under the stirring condition of 400r / min at room temperature for 20min, and then wash it Until the pH value of the filtrate is close to neutral, dry the product at 110°C for 10 hours; wherein the mass volume ratio of honeycomb stone to nitric acid solution is 15g / 100mL;

[0037] 2) Surface modification of honeycomb: Dissolve CTAB and PVA in deionized water, stir at room temperature for 35 minutes, then add NaOH and continue stirring for 10 minutes, then add tetraethyl orthosilicate (TEOS) and titanium dropwise tetrabutyl ester (TBT), and the pretreated honeycomb obtained in step (1) was added to it, and then the stirring was continued for 4 hours, and the resulting mixture was transferred to a hydrothermal reaction kettle for crystallization treatment at 125°C for 15 hours; The precipitate was washe...

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Abstract

The invention discloses a low-cost NH3-SCR denitration catalyst and a preparing method thereof. The preparing method comprises the steps that honeycomb stones washed with acid are used as carriers andcoated with mesoporous titanium silicon molecular sieves, and ammonium vanadate and zinc nitrate are used as active ingredients; the surfaces of the modified honeycomb stones are coated with a layerof the titanium silicon molecular sieves of a mesoporous structure, then the active ingredients which include ammonium vanadate and zinc nitrate are loaded, not only can erosion caused by alkali metalNa and K which are contained in the honeycomb stone base bodies to the active ingredients be inhibited, but also the denitration performance be improved; the specific surface area of the catalyst canalso be increased, and thus loading and dispersion of the active ingredients are facilitated; the two active ingredients form a Zn2V2O7 structure, on one hand, the reaction activity of NH3-SCR can beimproved, and on the other hand, sublimation of vanadium varieties under a high temperature condition can be obviously inhibited.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a denitration catalyst, in particular to a honeycomb stone-based denitration catalyst and a preparation method thereof. Background technique [0002] The rapid development of my country's social economy has brought about a continuous increase in energy consumption, which has led to a large consumption of fossil fuels such as coal. High-intensity coal consumption has led to a large amount of nitrogen oxide emissions, which has brought great harm to the social environment and human health. As my country's pollutant emission standards become increasingly strict, it is urgent to control the emission of nitrogen oxides represented by coal-fired power plants. [0003] Among many flue gas denitrification technologies, NH 3 Selective Catalytic Reduction of NO as Reductant x Due to its high denitrification efficiency and good economy, the SCR technology has become the most widely used...

Claims

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Application Information

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IPC IPC(8): B01J29/89B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01J29/89
Inventor 李俊霞
Owner 李俊霞
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