Method for preparing low-temperature SCR (Selective Catalytic Reduction) denitration catalyst

A technology of denitrification catalyst and composite catalyst, which is applied in the field of preparation of low-temperature SCR denitrification catalyst, can solve the problems of secondary pollution, economic cost, ammonia escape, etc., and achieve the effects of low cost, good low temperature effect and high efficiency

Active Publication Date: 2014-01-29
JIANGSU KEHANG ENVIRONMENT ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some catalysts always face problems such as mechanical properties, thermal stability, toxicity resistance, catalytic efficiency, ammonia slip, reproducibility, secondary pollution, and economic costs.

Method used

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  • Method for preparing low-temperature SCR (Selective Catalytic Reduction) denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Take the processed attapulgite clay to a mass of 3g, feed and configure the mixed solution according to the following parameters:

[0040] The quality of ferric nitrate nonahydrate is 5.050g;

[0041] The quality of tin chloride pentahydrate is 2.327g;

[0042] The mass of citric acid is 2g;

[0043] The mass of ethanol is 23.7g;

[0044] (2) Stir and reflux the obtained mixed solution until a sol is formed;

[0045] (3) Transfer the obtained sol to a hydrothermal reaction kettle, seal and react at 180°C for 8 hours; after the reaction, cool, filter, wash, and dry to obtain a composite catalyst;

[0046] (4) Grinding the composite catalyst into powder, raising the temperature at a rate of 10°C / mi, keeping it at 400°C for 2 hours, and cooling naturally to obtain a low-temperature SCR denitration catalyst.

Embodiment 2

[0048] (1) Take the processed attapulgite clay to a mass of 3g, feed and configure the mixed solution according to the following parameters:

[0049] The quality of ferric nitrate nonahydrate is 5.050g;

[0050] The quality of tin chloride pentahydrate is 1.164g;

[0051] The mass of citric acid is 2g;

[0052] The mass of ethanol is 23.7g;

[0053] (2) Stir and reflux the obtained mixed solution until a sol is formed;

[0054] (3) Transfer the obtained sol to a hydrothermal reaction kettle, seal and react at 180°C for 8 hours; after the reaction, cool, filter, wash, and dry to obtain a composite catalyst;

[0055] (4) Grinding the composite catalyst into powder, raising the temperature at a rate of 10°C / mi, keeping it at 400°C for 2 hours, and cooling naturally to obtain a low-temperature SCR denitration catalyst.

Embodiment 3

[0057] (1) Take the processed attapulgite clay to a mass of 3g, feed and configure the mixed solution according to the following parameters:

[0058] The quality of ferric nitrate nonahydrate is 5.050g;

[0059] The quality of tin chloride pentahydrate is 0.5816g;

[0060] The mass of citric acid is 2g;

[0061] The mass of ethanol is 23.7g;

[0062] (2) Stir and reflux the obtained mixed solution until a sol is formed;

[0063] (3) Transfer the obtained sol to a hydrothermal reaction kettle, seal and react at 180°C for 8 hours; after the reaction, cool, filter, wash, and dry to obtain a composite catalyst;

[0064] (4) Grinding the composite catalyst into powder, raising the temperature at a rate of 10°C / mi, keeping it at 400°C for 2 hours, and cooling naturally to obtain a low-temperature SCR denitration catalyst.

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Abstract

The invention relates to a method for preparing a low-temperature SCR (Selective Catalytic Reduction) denitration catalyst. The catalyst comprises the following raw materials: attapulgite, tetrachlorostannane pentahydrate, iron nitrate nonahydrate, cerium nitrate hexahydrate, barium nitrate, citric acid and ethyl alcohol. The method comprises the following three steps of: (1) pretreatment of the attapulgite; (2) composite deposition of active constituents and the attapulgite; and (3) calcination of the composite catalyst, wherein an intermittent stirring acid treatment method is adopted in the pretreatment step; the method for preparing the composite catalyst is a sol-hydrothermal method; and a temperature programmed calcination method is adopted in the catalyst calcining step. The method is low in production cost and simple in operation and the prepared denitration composite catalyst is good in low temperature performance, high in efficiency and renewable.

Description

technical field [0001] The invention relates to a method for preparing a low-temperature SCR denitrification catalyst, which is suitable for low-temperature flue gas treatment of coal-fired boilers in some factories such as thermal power plants and cement plants. Background technique [0002] Nitrogen oxides (NO x ) is one of the important components of air pollution, and the acid rain, photochemical smog, increased near-surface ozone concentration and haze weather caused by it have caused great harm to human health and animal and plant growth. Therefore, NO in the atmosphere x Content control has become an urgent fact. In 2012, my country revised the "Ambient Air Quality Standards" for the third time, reflecting the characteristics of protecting human health, realizing macro strategies and advancing with the times. NO is clearly stated in the standard x The concentration limit is 100mg / m 3 (focus area). At the same time, the Twelfth Five-Year Plan for the Prevention a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/835B01D53/90B01D53/56
Inventor 许琦肖峰陈智栋韩粉女李娄刚
Owner JIANGSU KEHANG ENVIRONMENT ENG TECH
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