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Low-temperature selective catalytic reduction (SCR) for flue gas denitrification and preparation method for low-temperature SCR catalyst

A SCR catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as immature technology, and achieve the effects of low price, strong adsorption capacity and large specific surface area

Inactive Publication Date: 2012-07-04
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the research and development of low-temperature SCR catalysts at home and abroad, the technology is relatively immature.

Method used

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  • Low-temperature selective catalytic reduction (SCR) for flue gas denitrification and preparation method for low-temperature SCR catalyst
  • Low-temperature selective catalytic reduction (SCR) for flue gas denitrification and preparation method for low-temperature SCR catalyst

Examples

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Effect test

Embodiment 1

[0030] A preparation method for the low-temperature SCR catalyst for flue gas denitrification, comprising the following steps:

[0031] 1) Pulverizing the pyrolysis slag, the particle size is 60-200 mesh;

[0032]2) Weigh 10g of waste tire pyrolysis slag, immerse in 13g of 90wt% phosphoric acid aqueous solution, keep stirring at room temperature for 1 hour to activate phosphoric acid, then dry at 110°C for 48h, and then use high-temperature water in a sealed furnace under nitrogen atmosphere. The steam is activated by water vapor, the activation temperature is 800°C, the activation time is 3 hours, and finally the sample is washed with deionized water to make the pH of the liquid 6-7;

[0033] 3) Add 5 g of the above-mentioned modified waste tire pyrolysis slag into 2.4 g of 90 wt% ferromanganese nitrate aqueous solution (the molar ratio of Fe and Mn in the solution is 1:1), soak for 3 hours, and then dry it in a water bath The main catalyst is loaded, then dried at 120° C., ...

Embodiment 2

[0036] A preparation method for the low-temperature SCR catalyst for flue gas denitrification, comprising the following steps:

[0037] 1) Pulverizing the pyrolysis slag, the particle size is 60-200 mesh;

[0038] 2) Weigh 10g of waste tire pyrolysis slag, immerse it in 20g of 60wt% phosphoric acid aqueous solution, keep stirring at room temperature for 1 hour, then dry at 110°C for 48h, and then use high-temperature water in a sealed furnace under nitrogen atmosphere. The steam is activated by water vapor, the activation temperature is 800°C, and the activation time is 1 hour. Finally, the sample is washed with deionized water to stabilize the pH value of the liquid at 6-7;

[0039] 3) Add 5 g of the above-mentioned modified waste tire pyrolysis slag into 18.8 g of 10 wt % manganese nitrate aqueous solution and soak for 3 h (the molar ratio of Fe and Mn in the solution is 0:1), and then dry in a water bath to complete the main process. The catalyst is loaded, then dried at 1...

Embodiment 3

[0042] A preparation method for the low-temperature SCR catalyst for flue gas denitrification, comprising the following steps:

[0043] 1) Pulverizing the pyrolysis slag, the particle size is 60-200 mesh;

[0044] 2) Take 10g of waste tire pyrolysis slag, immerse it in 15g of 80wt% phosphoric acid aqueous solution, keep stirring at room temperature for 1 hour, then dry at 110°C for 48h, then carry out high temperature activation under nitrogen atmosphere, the activation temperature is 800°C, the activation time is 2 hours, and finally the sample is washed with deionized water to stabilize the pH value of the liquid between 6 and 7. Put the sample into the furnace again, pass water vapor (flow rate is 3g / hour), the activation temperature is 900°C, and the activation time is 2 hours;

[0045] 3) Add 5 g of the above-mentioned modified waste tire pyrolysis slag into 2.6 g of manganese nitrate / iron nitrate aqueous solution (the molar ratio of Fe and Mn in the solution is 0.5:1) w...

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Abstract

The invention discloses a low-temperature selective catalytic reduction (SCR) catalyst for flue gas denitrification. Modified waste tyre pyrolysis slag is used as a carrier, and MnOx-FeOx is used as a main catalyst. The catalyst is prepared by adopting an impregnation method and prepared by the following steps of: 1) crushing the pyrolysis slag; 2) impregnating the waste tyre pyrolysis slag into an aqueous solution of phosphoric acid for phosphoric acid activation, and performing water vapor activation in a sealed furnace body in a nitrogen atmosphere by using high-temperature water vapor; and 3) soaking in an aqueous solution of ferromanganese salt, drying in a water bath to finish main catalyst loading, calcining under the protection of nitrogen or argon atmosphere after drying, and thus obtaining the low-temperature SCR catalyst. The invention has the advantages that: the operating temperature of SCR is reduced, and the catalyst can reach high NO removal rate at the temperature of below 200 DEG C in an SCR technology when NH3 is used as a reducing agent; and by using the modified pyrolysis slag as the carrier, the catalyst is large in specific surface area, strong in adsorption capacity and low in price, and waste can be changed into valuable.

Description

technical field [0001] The invention relates to a catalyst for flue gas denitrification process, in particular to a low-temperature SCR catalyst for flue gas denitrification and a preparation method thereof. Background technique [0002] my country's energy structure is dominated by coal, and coal consumption will continue to grow. According to statistics, thermal power installed capacity accounts for more than 74% of my country's installed power generation capacity. For a long period of time in the future, nitrogen oxide pollution caused by coal burning will be another important environmental problem after sulfur dioxide pollution. At the same time, the "Emission Standard of Air Pollutants for Thermal Power Plants (GB13223-2003)" implemented in January 2004 reduced the maximum allowable emission concentration of nitrogen oxides from power plant boilers in the third period to 450-1100mg / m 3 . On March 23, 2009, the "2009-2010 National Pollution Prevention and Control Work ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/90B01D53/56
Inventor 沈伯雄
Owner NANKAI UNIV
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