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A kind of preparation method of anti-sulfur denitration catalyst

A denitrification catalyst and stabilizer technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of narrow operating temperature range, serious treatment pollution, poor low temperature activity, etc., and achieve The active temperature range is wide, the preparation process is simple, and the high temperature stability is good.

Inactive Publication Date: 2019-07-09
INNER MONGOLIA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a preparation method of a sulfur-resistant denitrification catalyst, which solves the problem that although the vanadium-based catalysts commonly used in the prior art have good activity and stability, they have high toxicity, serious pollution in subsequent treatment, narrow use temperature range, and low-temperature activity. bad question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of anti-sulfur denitrification catalyst, comprises the following steps:

[0029] Step 1, TiO 2 Preparation of hydrosols

[0030] Add 50g of n-butyl titanate to 1L of deionized water, stir at room temperature for 5h, obtain metatitanic acid precipitate after fully hydrolyzing the reaction, add 1.5g of concentrated nitric acid with a mass percentage concentration of 65% and 100g of mass percent to the metatitanic acid precipitate The percentage concentration is 50% hydrogen peroxide, and ultrasonic power of 100W is used for 30 minutes to obtain TiO 2 Hydrosol precursor, to TiO 2 Add 1g acetylacetone to the hydrosol precursor, heat to reflux for 5h, cool to room temperature and let it stand for 1h to obtain TiO 2 Hydrosol;

[0031] Step 2, TiO 2 -SiO 2 Preparation of composite carrier

[0032] 500gTiO 2 Add 250 g of nitric acid solution with a concentration of 1 mol / L to the hydrosol, stir evenly at room temperature, then add 25 g of tetraethyl orthosilicate...

Embodiment 2

[0041] A kind of anti-sulfur denitrification catalyst, comprises the following steps:

[0042] Step 1, TiO 2 Preparation of hydrosols

[0043] Add 30g of n-butyl titanate into 2L of deionized water, stir at room temperature for 6h, obtain metatitanic acid precipitate after full hydrolysis reaction, add 0.3g of concentrated nitric acid with a mass percentage concentration of 65% and 30g of mass percent to the metatitanic acid precipitate The percentage concentration is 50% hydrogen peroxide, and ultrasonic power of 150W is used for 40 minutes to obtain TiO 2 Hydrosol precursor, to TiO 2 Add 0.3g of isopropanol to the water sol precursor, heat and reflux for 8h, cool to room temperature and let stand for 1.5h to obtain TiO 2 Hydrosol;

[0044] Step 2, TiO 2 -SiO 2 Preparation of composite carrier

[0045] 100gTiO 2 Add 50 g of nitric acid solution with a concentration of 1 mol / L to the hydrosol, stir evenly at room temperature, then add 6 g of tetraethyl orthosilicate to...

Embodiment 3

[0054] A kind of anti-sulfur denitrification catalyst, comprises the following steps:

[0055] Step 1, TiO 2 Preparation of hydrosols

[0056] Add 100 g of n-butyl titanate to 10 L of deionized water, stir at room temperature for 8 hours, and obtain a metatitanic acid precipitate after fully hydrolyzing the reaction. Add 5 g of concentrated nitric acid with a concentration of 65% by mass and 200 g of concentrated nitric acid to the metatitanic acid precipitate. Concentration is 50% hydrogen peroxide, with ultrasonic power of 200W ultrasonic 60min, obtain TiO 2 Hydrosol precursor, to TiO 2 Add 5g of isopropanol to the water sol precursor, heat and reflux for 10h, cool to room temperature and let stand for 2h to obtain TiO 2 Hydrosol;

[0057] Step 2, TiO 2 -SiO 2 Preparation of composite carrier

[0058] 500gTiO 2 Add 200 g of nitric acid solution with a concentration of 1 mol / L to the hydrosol, stir evenly at room temperature, then add 40 g of tetraethyl orthosilicate ...

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Abstract

The invention discloses a preparation method of a sulfur-resistant and denitration catalyst. The preparation method of the sulfur-resistant and denitration catalyst comprises the following steps: preparing TiO2 hydrosol, preparing a TiO2-SiO2 composite carrier, modifying the TiO2-SiO2 composite carrier and preparing a V2O5-WO3 / TiO2-SiO2 catalyst. The sulfur-resistant and denitration catalyst prepared by the method takes the modified TiO2 as a catalyst carrier raw material, and the prepared TiO2-SiO2 composite carriers are modified again, so the use of titanium dioxide is avoided and the production cost is reduced; furthermore, the raw material and the composite carrier are modified, so that the grain size of the composite carrier is reduced, the specific surface area and the uniformity degree of the composite carrier are increased, the prepared sulfur-resistant and denitration catalyst is long in service life, wide in active temperature interval, particularly high in low-temperature activity and high high-temperautre stability, and the preparation process is simple, low in toxicity, high in water vapor resistance and strong in SO2 resistance.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a sulfur-resistant denitrification catalyst. Background technique [0002] Selective Catalytic Reduction (SCR) Removal of NO X It is a mature flue gas denitrification technology. At present, commercial SCR catalysts are mostly vanadium-based catalysts. The catalyst’s activity temperature is 300-400°C, and it is mostly arranged in front of the air preheater. Dust and SO 2 It will wash away the catalyst and poison it. At the same time, the high flue gas temperature will cause the catalyst to sinter and deactivate, shortening the life of the catalyst. [0003] At present, the main components of commercial catalysts have been disclosed, and the most widely used commercial catalysts are vanadium-based catalysts, which have good activity and stability, but vanadium is a toxic substance, and the follow-up treatment causes serious pollution, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/30B01J2523/00B01J2531/46B01J2531/56B01J2531/66B01J2523/41
Inventor 周晨亮王亚雄赫文秀张强李莉丽刘全生吴刚强郎中敏韩晓星徐喜民于戈文杨启山丁健兰大为段建国
Owner INNER MONGOLIA UNIV OF SCI & TECH
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