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Application method for MIL-100(Fe) catalyst in NH3-SCR (Selective Catalytic Reduction) reaction

A technology of NH3-SCR and catalysts, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., and can solve problems such as poor adsorption capacity, high porosity, and high working temperature. problem, to achieve good denitrification effect

Inactive Publication Date: 2014-04-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve most NH 3 -SCR catalyst has poor adsorption capacity for NO, high working temperature and easy to generate N 2 O and other shortcomings, MOFs have the advantages of high specific surface area, high porosity and more active sites.

Method used

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  • Application method for MIL-100(Fe) catalyst in NH3-SCR (Selective Catalytic Reduction) reaction
  • Application method for MIL-100(Fe) catalyst in NH3-SCR (Selective Catalytic Reduction) reaction
  • Application method for MIL-100(Fe) catalyst in NH3-SCR (Selective Catalytic Reduction) reaction

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Synthesis and Purification of MIL-100(Fe) Catalyst by Hydrothermal Method

[0030] Weigh 277.5mgFe powder and 687.5mgH 3 BTC mixed into 25ml ultrapure water, and 200ul HF and 190ul HNO 3Add it into it, and then use a glass rod to continuously stir for about 5 minutes, then transfer the mixed solution to a 100ml reaction kettle with a polytetrafluoroethylene liner, and seal it. Then the reaction vessel was heated in an oven at 150 °C for 15 h. After the reaction was completed, the reactor was cooled to room temperature. Centrifuge and dry overnight in an oven at 80°C to obtain a light orange powdery solid. Purification of Fe-MOFs: First, mix the obtained light orange sample with ultrapure water (1.0g sample / 350ml ultrapure water) into a 500ml beaker, and stir in an oil bath at 80°C for 5h. It was centrifuged; then, the sample was mixed with fresh ethanol solution (1.0g sample / 200ml ethanol), and stirred in an oil bath at 60°C for 3h. Cool to room temperature, centri...

Embodiment 2

[0032] for NH 3 -The method of the MIL-100 (Fe) catalyst of SCR reaction, its step is as follows:

[0033] (1) Pretreatment of MIL-100(Fe) catalyst: take not less than 0.3g of MIL-100(Fe) catalyst, press it into tablets under the condition of 5-15Mpa, crush and sieve to obtain 20-40 mesh MIL- 0.2g of 100(Fe) catalyst particles, which is NH 3 - MIL-100(Fe) catalyst for SCR reaction;

[0034] (2) NH 3 -SCR reaction: Place the MIL-100(Fe) catalyst obtained in step (1) on the quartz wool of the reaction tube equipped with quartz wool. The reaction tube is a U-shaped quartz tube with an inner diameter of 4mm, and there is a section of diameter on the left side Dilated to 8mm and 6cm in length. Fix the thermocouple on the quartz tube with copper wire. Close the resistance furnace and seal the nozzle. NO, NH 3 , O 2 and N 2 The valve of the gas is opened, and the gas is mixed and passed into the quartz reaction tube; the reaction temperature is 25°C; the mixed gas is NO, NH ...

Embodiment 3

[0036] for NH 3 -The method of the MIL-100 (Fe) catalyst of SCR reaction, its step is as follows:

[0037] (1) Pretreatment of Fe-MOFs catalyst: take not less than 0.3g of MIL-100(Fe) catalyst, press it into tablets under the condition of 5-15Mpa, crush it, and sieve it to obtain 20-40 mesh Fe-MOFs catalyst particles 0.2g, that is NH 3 - MIL-100(Fe) catalyst for SCR reaction;

[0038] (2) NH 3 -SCR reaction: Place the MIL-100(Fe) catalyst obtained in step (1) on the quartz wool of the reaction tube equipped with quartz wool. The reaction tube is a U quartz-shaped tube with an inner diameter of 4mm, and there is a section of diameter Dilated to 8mm and 6cm in length. Fix the thermocouple on the quartz tube with copper wire. Close the resistance furnace and seal the nozzle. NO, NH 3 , O 2 and N 2 The valve of the gas is opened, and the gas is mixed and passed into the quartz reaction tube; the reaction temperature is 220°C; the mixed gas is NO, NH 3 , O 2 , N 2 Mixin...

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Abstract

The invention relates to an application method of MIL-100(Fe) catalyst in NH3-SCR (Selective Catalytic Reduction) reaction, which belongs to the technical field of atmospheric pollution control smoke denitrification. The invention relates to a Fe-MOFs catalyst for NH3-SCR reaction and a preparation method thereof. The method comprises the following steps of tabletting and pulverizing the measured Fe-MOFs catalyst powder not less than 0.3g, sieving the Fe-MOFs catalyst powder to obtain 20-mesh to 40-mesh Fe-MOFs catalyst for the NH3-SCR reaction; arranging the Fe-MOFs catalyst onto silica wool in a reaction pipe, and blowing mixed gas into the reaction pipe, wherein the reaction temperature is 25 to 300 DEG C, the mixed gas is the mixture of NO, NH3, O2 and N2, the flow rate of the mixed gas is 100ml / min, the concentration ratio of the NH3 and NO is 1:(1-1.2), the concentration of O2 is 1 to 10 percent of the flow rate of the mixed gas, and N2 is used as the reaction balance gas. The Fe-MOFs catalyst is primarily applied to the NH3-SCR catalyst, and the denitrification effect is good.

Description

technical field [0001] The invention belongs to the technical field of air pollution control flue gas denitrification, in particular to a 3 - MIL-100(Fe) catalyst for SCR reaction and preparation method thereof. Background technique [0002] In recent years, due to the continuous increase of NOx in the atmosphere, the acid rain and photochemical smog caused by it have seriously affected human health and the atmospheric environment. Therefore, the removal of NOx has become a research hotspot for researchers. NOx in the atmosphere mainly includes NO and NO 2 . At present, among the main methods for removing NOx, due to the 3 -The temperature required for the SCR reaction is low, the efficiency is high, and the generated N 2 It is widely used because of the advantages of no secondary pollution. NH 3 -SCR catalysts mainly include noble metal catalysts, molecular sieve catalysts and metal oxide catalysts. Among them, V 2 o 5 -WO 3 / TiO 2 As the only catalyst currently...

Claims

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Application Information

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IPC IPC(8): B01D53/88B01D53/90B01D53/56B01J31/28
Inventor 石勇刘晓微李春艳肇启东李新勇
Owner DALIAN UNIV OF TECH
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