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Method for degrading nitrogen oxide by virtue of visible light catalysis

A technology for catalytic degradation and nitrogen oxides, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problem of low utilization rate of solar energy, achieve high utilization rate of visible light, improve utilization rate, and mild reaction conditions Effect

Active Publication Date: 2018-12-18
四川文理学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But TiO 2 The photocatalyst has a wide band gap (Eg=3.2eV, from λ=1239.8\Eg, λ=387nm), and can only be excited by ultraviolet light with a wavelength not greater than 387nm, and this part of ultraviolet light (300-400nm) only takes up the ground 4% to 6% of the solar energy on the surface, the utilization rate of solar energy is very low

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  • Method for degrading nitrogen oxide by virtue of visible light catalysis
  • Method for degrading nitrogen oxide by virtue of visible light catalysis

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Embodiment 1

[0027] Disperse 100 mg of zirconocene dichloride in 50 ml of ethanol, ultrasonicate for 50 min, stir for 1.5 h, mix well, transfer to an evaporating dish, and evaporate the solvent at 60-70 °C. Place the evaporating dish in the photocatalytic degradation device to detect the photocatalytic degradation activity of NO, adjust the flow rate of NO to 5mL / min, and the flow rate of dry air to 1.5L / min. At this time, the concentration of NO is 600ppb, and turn on the 150W metal halide Lamp, visible light irradiation cycle degrades NO, opens the tail gas discharge valve to release the tail gas every 1 minute of degradation, detects the NO content in the tail gas by gas chromatography, and draws the figure 1 (Degradation rate diagram of zirconocene dichloride catalytic degradation of NO). From figure 1 We can see that when the visible light irradiation cycle degradation time is 10 minutes, the NO content in the tail gas is the lowest, and the NO degradation rate reaches the highest,...

Embodiment 2

[0029]Disperse 100 mg of zirconocene dichloride in 50 ml of ethanol, ultrasonicate for 40 min, stir for 1.5 h, mix well, transfer to an evaporating dish, and evaporate the solvent to dryness at 60-70°C. Place the evaporating dish in the photocatalytic degradation device to detect the photocatalytic degradation activity of NO, adjust the flow rate of NO to 5mL / min, and the flow rate of dry air to 1.5L / min. At this time, the concentration of NO is 600ppb, and turn on the 150W metal halide After 10 minutes of visible light cycle degradation time, the tail gas discharge valve was opened to release the tail gas. The NO content in the tail gas was measured by gas chromatography to be 326.4ppb, so the NO degradation rate was 45.6%.

Embodiment 3

[0031] Disperse 100 mg of zirconocene dichloride in 50 ml of ethanol, ultrasonicate for 60 min, stir for 1.5 h, mix well, transfer to an evaporating dish, and evaporate the solvent at 60-70 °C. Place the evaporating dish in the photocatalytic degradation device to detect the photocatalytic degradation activity of NO, adjust the flow rate of NO to 5mL / min, and the flow rate of dry air to 1.5L / min. At this time, the concentration of NO is 600ppb, and turn on the 150W metal halide Lamp, visible light irradiation cycle degradation time of 10 minutes, open the tail gas outlet valve to release the tail gas, the NO content in the tail gas measured by gas chromatography is 296.4ppb, so the NO degradation rate is 50.6%.

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Abstract

The invention discloses a method for degrading nitrogen oxide by virtue of visible light catalysis. The method adopts zirconocene dichloride as a photocatalyst, and adopts a photocatlaytic degradationmethod to catalytically degrade the nitrogen oxide. The Zzirconocene dichloride is adopted as the photocatalyst, so that compared with the existing titanium dioxide catalyst, the visible light utilization rate is high; when the catalyst is used for photocatalytically degrading the nitrogen oxide, the catalysis can be directly performed in the range of visible light, and the degradation rate of NOcan reach 65.8 percent; and by adopting the titanium dioxide catalyst, when the degradation is directly catalyzed in the range of the visible light, the degradation rate of NO is less than 10 percent, and even after the ion mixing step is performed, the degradation rate of NO is only about 50 percent. Therefore, by adopting the method, while the degradation rate of the nitrogen oxide is ensured,the degradation can be directly catalyzed under the radiation of the visible light, so that the utilization rate of the solar energy can be improved, the ion doping step can be avoided, the process issimpler, and the industrialized implementation of the photocatallaytic degradation of the nitrogen oxide can be facilitated.

Description

technical field [0001] The invention relates to a method for catalytically degrading nitrogen oxides with visible light. Background technique [0002] Nitrogen oxides (NO x ) mainly includes NO, NO 2 , my country's nitrogen oxide emissions in 2007 alone was 16.434 million tons, which is one of the main components of air pollutants. Atmospheric NO x , exposed to sunlight and O in the air 2 When it reacts with organic matter, it can form aldehydes, ketones and organic acids, which lead to the occurrence of photochemical smog and acid rain. With the rapid development of industry, the treatment of nitrogen oxides has become a severe and urgent research content. NO x The most common method is the catalytic reduction method, but this method has high equipment investment and operating costs, and produces secondary pollution, so it can only be limited to fixed source NO x Eliminate such shortcomings. In recent years, many studies have shown that photocatalytic technology has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01D53/86B01D53/56
CPCB01D53/8628B01J31/0232B01J35/39
Inventor 向文军朱朝菊周绿山刘丹余雪梅
Owner 四川文理学院