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Preparation method of catalyst for sintering flue gas and desulfurizing and denitrifying

A technology for desulfurization, denitrification, and sintering flue gas, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc.

Active Publication Date: 2009-08-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium desulfurization is widely used due to its flexible operation and low cost. However, the pressure of sintering flue gas is negative pressure, and its pressure head mainly comes from the air induction device behind the system. The calcium desulfurization process consumes the main pressure head, so the flue gas It is difficult for gas to pass through the denitrification catalyst bed, so the sintering flue gas of metallurgical enterprises is generally discharged directly into the atmosphere after desulfurization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve 0.1mol of chromium nitrate and 0.3mol of cerium nitrate in 300mL of ethanol, add 40g of activated carbon particles to it, and its specific surface area is 800m 2 / g, the system was heated and stirred at 90°C and evaporated to dryness, and then burned in a nitrogen atmosphere at 400°C for 3 hours to obtain a catalyst capable of simultaneous desulfurization and denitrification at low temperature.

Embodiment 2

[0016] Dissolve 0.1mol of chromium sulfate and 0.5mol of cerium chloride in 500mL of water, add 600g of active coke particles to it, and its specific surface area is 200m 2 / g, the system was evaporated to dryness with heating and stirring at 110°C, and burned in an argon atmosphere at 600°C for 5 hours to obtain a catalyst capable of simultaneous desulfurization and denitrification at low temperature.

Embodiment 3

[0018] Dissolve 0.1mol chromium chloride and 0.1mol cerium sulfate in 200mL water, add 40g active coke particles to it, its specific surface area is 600m 2 / g, the system was evaporated to dryness with heating and stirring at 105°C, and burned in a helium atmosphere at 500°C for 4 hours to obtain a catalyst capable of simultaneous desulfurization and denitrification at low temperature.

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PUM

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Abstract

The invention provides a method for preparing a catalyst which can realize desulphurization and denitration of sintered fume at the same time, and belongs to the technical field of material preparation and waste gas treatment. In the method, chromium and cerium are taken as main components, active carbon or active coke is taken as a carrier, and the materials are soaked and burned in the atmosphere of inert gas to obtain the catalyst which can effectively catalyze NH3 and reduce NOx into N2 at a low temperature; the catalyst has high low-temperature activity, and can tolerate the interference of as high as 6 percent of CO in the system; and simultaneously, the catalyst can also catalyze and oxidize SO2 into SO3 and store the SO3 in the form of (NH4)2SO4, so that the reutilization of the SO2 in the waste gas is realized, and the catalyst has wider application prospect in the desulphurization and denitration operation of the sintered fume.

Description

technical field [0001] The invention relates to a preparation method of a catalyst used for simultaneous desulfurization and denitrification of sintering flue gas, and belongs to the technical field of material preparation and waste gas treatment. Background technique [0002] Nitrogen oxides (NO x , including NO and NO 2 ) emissions have become one of the most important sources of air pollution in my country. my country is the world's largest steel producer, and steel sintering flue gas NO x Emissions account for about NO x 10% of the total discharge has not been treated with denitrification, which has seriously threatened the ecological environment and hindered the sustainable development of economy and society. The composition of sintering flue gas is complex and contains NO x , CO, O 2 , N 2 , SO 2 and a small amount of HCl, and the temperature of the sintering flue gas is relatively low, generally at 80-150°C. These factors make it difficult to treat the sinteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J21/18B01D53/60B01D53/86
CPCY02A50/20
Inventor 刘海弟张冬海岳仁亮陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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