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A method for photocatalytic oxidation of ammonia

A technology of photocatalytic oxidation and catalytic oxidation, which is applied in the field of photocatalysis, can solve the problems of ineffective photocatalytic oxidation of ammonia, and achieve the effects of easy preparation method, low cost and simple raw materials

Active Publication Date: 2021-01-26
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the inability to effectively photocatalytically oxidize ammonia under visible light conditions in the prior art, the purpose of the present invention is to provide a method that can efficiently photocatalystly oxidize ammonia under visible light

Method used

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  • A method for photocatalytic oxidation of ammonia

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Embodiment 1

[0037] This embodiment provides a method for catalytic oxidation of ammonia using silver phosphate as a catalyst under visible light, the specific method being:

[0038] Take silver phosphate (Ag 3 PO 4 ) Catalyst 100mg, disperse into water ultrasonically, drop in the disk that diameter is 8cm, after natural drying makes film, put disk into reactor, obtain the reactor that silver phosphate is housed; The gas is passed into the reactor equipped with silver phosphate at a flow rate of 50mL / min, and the catalytic oxidation reaction is carried out by irradiating visible light with a wavelength of 600nm under the temperature condition of 25°C. The reaction time is 75min, and the ammonia gas is catalytically oxidized .

[0039] Wherein, the visible light is obtained by filtering out ultraviolet light from a xenon lamp. In the gas to be treated containing ammonia, the volume concentration of ammonia is 50 ppm, the volume concentration of oxygen is 20%, and nitrogen is the balance ...

Embodiment 2

[0043] This embodiment provides a method for catalytic oxidation of ammonia using silver phosphate as a catalyst under visible light, the specific method being:

[0044] Take silver phosphate (Ag 3 PO 4 ) Catalyst 100mg, disperse into water ultrasonically, drop in the disk that diameter is 8cm, after natural drying makes film, put disk into reactor, obtain the reactor that silver phosphate is housed; The gas is passed into the reactor equipped with silver phosphate at a flow rate of 20mL / min, and the catalytic oxidation reaction is carried out by irradiating visible light with a wavelength of 420nm at a temperature of 25°C. The reaction time is 50min, and the ammonia gas is catalytically oxidized .

[0045] Wherein, the visible light is obtained by filtering out ultraviolet light from a xenon lamp. In the gas to be treated containing ammonia, the volume concentration of ammonia is 100 ppm, the volume concentration of oxygen is 15%, and nitrogen is the balance gas.

[0046]...

Embodiment 3

[0049] This embodiment provides a method for catalytic oxidation of ammonia using silver phosphate as a catalyst under visible light, the specific method being:

[0050] Take silver phosphate (Ag 3 PO 4 ) Catalyst 100mg, disperse into water ultrasonically, drop in the disk that diameter is 8cm, after natural drying makes film, put disk into reactor, obtain the reactor that silver phosphate is housed; The gas is passed into the reactor equipped with silver phosphate at a flow rate of 50mL / min, and the catalytic oxidation reaction is carried out by irradiating visible light with a wavelength of 800nm ​​under the temperature condition of 40°C. The reaction time is 10min, and the ammonia gas is catalytically oxidized .

[0051] Wherein, the visible light is obtained by filtering out ultraviolet light from a xenon lamp. In the gas to be treated containing ammonia, the volume concentration of ammonia is 25ppm, the volume concentration of oxygen is 25%, and nitrogen is the balance...

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Abstract

The invention provides a method for photocatalytic oxidation of ammonia, which belongs to the field of photocatalysis. The method comprises: using silver phosphate as a catalyst to catalytically oxidize ammonia under visible light. The method provided by the invention uses silver phosphate as a catalyst, and the catalyst has excellent performance in catalytic oxidation of ammonia under visible light. For the ammonia-containing gas to be treated with a volume concentration of ammonia of 50 ppm, the photocatalytic 10min ammonia conversion rate under visible light is 50% or more, and the photocatalytic ammonia conversion rate of 75 minutes under visible light is more than 75%, which makes the large-scale application prospect of the method provided by the invention good. Silver phosphate as a catalyst requires simple raw materials for preparation, and the preparation method is easy and repeatable, which reduces the cost of the method for photocatalytic oxidation of ammonia provided by the invention.

Description

technical field [0001] The invention belongs to the field of photocatalysis and relates to a method for photocatalytic oxidation of ammonia. Background technique [0002] Ammonia (NH 3 ) is one of the typical indoor pollutants, and it is also an important precursor for the formation of haze in the atmospheric environment, which is a serious hazard to human health. Photocatalysis technology is a new type of pollutant treatment technology. When a semiconductor is irradiated by light with energy greater than its forbidden band width, electrons in the semiconductor valence band (VB) will absorb the energy of photons and transition to the conduction band (CB). , thus generating electrons in the conduction band (e - ), while generating holes in the valence band (h + ), electrons and holes migrate to the surface for redox reactions. Widely used TiO 2 The material has good purification NH under UV light 3 effect, however, ultraviolet light is harmful to human health and produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/58B01J27/18
CPCB01D53/8634B01J27/1817B01J35/39
Inventor 贺泓张长斌陈敏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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