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Metal-organic framework material cu-btc for nitrogen oxide removal by selective catalytic reduction

A technology of organic framework and nitrogen oxides, applied in the field of flue gas denitrification, to achieve the effects of improving activity, increasing yield, strong thermal stability and water resistance

Inactive Publication Date: 2015-08-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no research report on its application as a catalyst for the removal of nitrogen oxides.

Method used

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  • Metal-organic framework material cu-btc for nitrogen oxide removal by selective catalytic reduction
  • Metal-organic framework material cu-btc for nitrogen oxide removal by selective catalytic reduction
  • Metal-organic framework material cu-btc for nitrogen oxide removal by selective catalytic reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Synthesis and Purification of Cu-BTC

[0025] Weigh 1.772g of copper nitrate trihydrate and 0.8484g of trimesic acid into 24ml of ultra-pure water and absolute ethanol respectively, and ultrasonicate the two solutions respectively. After they are all dissolved (about 5min), mix the two solutions and Transfer to a 100 ml sealable autoclave with a teflon liner. Then the reactor was placed in a preheated oven at 120°C for 24 hours. After the reaction was completed, the reactor was cooled to room temperature at normal temperature. Centrifugation was performed and the obtained samples were dried in an oven at 80°C. Purification of Cu-BTC: put 1.0g of the sample prepared in the above steps into 300ml of ultrapure water, soak it at room temperature for 8h after stirring, and centrifuge it; then, put the sample in 300ml of absolute ethanol, Soak at room temperature for 8 hours after stirring. centrifuged, washed three times with absolute ethanol, dried in an oven at 80°C af...

Embodiment 2

[0027] Activation treatment of Cu-BTC

[0028] Activation of Cu-BTC: Press the purified sample into tablets, pulverize it, and sieve it to make 20-40 mesh granules. Divide the sample into 4 parts, and put about 0.3g of each part into a quartz reaction tube with an inner diameter of 6mm. Continuously feed high-purity N at 30ml / min 2 , heated at a rate of 10°C / min from room temperature to different temperatures for activation, the temperatures were 180°C, 210°C, 230°C, 250°C and then kept at this temperature for 3h. XRD patterns of different catalysts, such as figure 2 . Among them, the unactivated Cu-BTC has one more peak at about 6° than the activated Cu-BTC, and there is no other difference. This peak may be due to dehydration after activation. There was no difference between the catalysts activated at each temperature. Infrared characterization diagrams of each catalyst, image 3 . The different peak intensities of the various catalysts are caused by the different am...

Embodiment 3

[0030] Activity test of Cu-BTC activated at 180°C

[0031] The specific experimental process is as follows: 0.2 g of the Cu-BTC catalyst activated at 180° C. prepared in Example 2 was weighed and loaded into a fixed-bed reactor with an inner diameter of 6 mm and a heating function. Simulated flue gas conditions: 500ppm NO, 500ppm NH 3 , 5%O 2 , balance gas N 2 , the flow rate is 100ml / min, and the temperature range is 140~300℃. The simulated flue gas is passed through a fixed-bed reactor equipped with a catalyst and heated, and a point is taken within the above temperature range and the NO concentration value is recorded by a flue gas analyzer. It was measured that the NO conversion rate was 45% at 200°C and reached 100% at 240°C.

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Abstract

The invention provides a metal-organic frame material Cu-BTC for removing nitric oxide with the selective catalytic reduction method, and belongs to the field of flue gas denitrification. The metal-organic frame material Cu-BTC for removing nitric oxide with the selective catalytic reduction method is characterized by adding Cu-BTC to a reaction tube, charging N2, heating to reach 180 to 250 DEG C, maintaining for more than 1.5 hours, preparing particles of 20-60 meshes through activated Cu-BTC, transferring into another reaction tube with silica wool plugged, and then charging NO, NH3, O2 and N2, wherein the mixed gas is at flow rate of 100-200ml / min; and each of gases is at the concentration shown as NO=NH3=500-1,000ppm, O2 accounts for 2 to 5%, and N2 serves as balanced gas; and the reaction condition is that the temperature is 140 to 320 DEG C. The metal-organic frame material Cu-BTC is used for the first time in the selective catalytic reduction method for removing nitric oxide by using NH3 as a reducing agent, and shows a good catalyzing effect in the low-temperature selective catalytic reduction method for removing nitric oxide; and the material has the advantages of being nontoxic, harmless, convenient to manufacture, low in price, etc., and is a potential good catalyzing material.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, and relates to the use of a metal-organic framework material Cu-BTC as a catalyst for the removal of nitrogen oxides by a selective catalytic reduction method. Background technique [0002] With the development of my country's economy, the emissions of automobile exhaust and factory smoke are increasing year by year. The environmental hazards caused by nitrogen oxides in flue gas are also gradually emerging. It mainly causes serious environmental problems such as acid rain and photochemical smog. Therefore, controlling the emission of nitrogen oxides has attracted more and more attention. [0003] At present, among many nitrogen oxide removal methods, the flue gas denitrification method of the selective catalytic reduction method is widely used because of its high efficiency and no secondary pollution. Catalysts used in selective catalytic reduction mainly include noble metal catalysts,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56C07C51/00C07C63/307B01J31/22
Inventor 石勇张浩李春艳肇启东李新勇薛方红
Owner DALIAN UNIV OF TECH
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