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Preparation method of catalyst for photocatalytically decomposing toxic and hazardous gas PH3

A harmful gas, catalytic decomposition technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of human health damage, low added value, secondary pollution, etc., to promote phosphine dehydrogenation, promote Electron transfer, effect of preventing structure collapse

Inactive Publication Date: 2018-05-25
天津格林凯恩化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Phosphine (PH 3 ) is a strong reducing gas with foul smell, colorless, highly toxic, flammable and carcinogenic. It is mainly produced in chemical production processes such as yellow phosphorus production, calcium carbide production, magnesium powder production, and sodium hypophosphite production. 3 If the exhaust gas is directly discharged into the atmosphere without treatment, it will cause a series of serious environmental problems such as air pollution, ecological damage, and human health damage.
Traditional PH 3 Exhaust gas purification methods include combustion method, gas-solid phase adsorption method, and redox method, etc., which generate low value-added phosphorus oxide compounds, which not only have low economic benefits, but also produce secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A photocatalytic decomposition of toxic and harmful gas PH 3 The preparation method of the catalyst comprises the following steps: 1) Slowly pour 50 mL of 20% concentrated sulfuric acid into 5 g of natural halloysite nanotubes, and heat in a water bath at 80°C. After magnetic stirring for 4 h, it was cooled and filtered with suction, and washed with water until neutral. Dry the washed solid at 80°C for 4 h, cool and grind into powder for use; 2) Dissolve 5 mL of butyl titanate in 20 mL of ethanol solution, add halloysite nanotubes in 1) under magnetic stirring 10 mL of distilled water, 5 mL of hydrochloric acid and 10 mL of ethanol mixed solution were added dropwise with heating and stirring at 50 °C, after continuous stirring for 5 h, dried at 80 °C for 24 h, and calcined at 500 °C for 2 h, the halloysite with honeycomb structure was formed / titanium dioxide composite powder; 3) Then, the halloysite / titanium dioxide composite powder obtained in 2) was placed in a mixe...

Embodiment 2

[0015] A photocatalytic decomposition of toxic and harmful gas PH 3 The preparation method of the catalyst comprises the following steps: 1) Slowly pour 50 mL of 20% concentrated sulfuric acid into 3 g of natural halloysite nanotubes, and heat in a water bath at 80°C. After magnetically stirring for 4 h, cool and filter with suction, and wash with water until neutral. Dry the washed solid at 80°C for 4 h, cool and grind into powder for use; 2) Dissolve 8 mL of butyl titanate in 20 mL of ethanol solution, add halloysite nanotubes in 1) under magnetic stirring 10 mL of distilled water, 5 mL of hydrochloric acid and 10 mL of ethanol mixed solution were added dropwise with heating and stirring at 50 °C, after continuous stirring for 5 h, dried at 80 °C for 24 h, and calcined at 500 °C for 2 h, the halloysite with honeycomb structure was formed / titanium dioxide composite powder; 3) Then, the halloysite / titanium dioxide composite powder obtained in 2) was placed in a mixed solutio...

Embodiment 3

[0017] A photocatalytic decomposition of toxic and harmful gas PH 3The preparation method of the catalyst comprises the following steps: 1) Slowly pour 50 mL of 20% concentrated sulfuric acid into 3 g of natural halloysite nanotubes, and heat in a water bath at 80°C. After magnetic stirring for 4 h, it was cooled and filtered with suction, and washed with water until neutral. Dry the washed solid at 80°C for 4 h, cool and grind into powder for use; 2) Dissolve 5 mL of butyl titanate in 20 mL of ethanol solution, add halloysite nanotubes in 1) under magnetic stirring 10 mL of distilled water, 5 mL of hydrochloric acid and 10 mL of ethanol mixed solution were added dropwise with heating and stirring at 50 °C, after continuous stirring for 5 h, dried at 80 °C for 24 h, and calcined at 500 °C for 2 h, the halloysite with honeycomb structure was formed / titanium dioxide composite powder; 3) Then, the halloysite / titanium dioxide composite powder obtained in 2) was placed in a mixed...

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Abstract

The invention relates to a preparation method of a catalyst for photocatalytically decomposing a toxic and hazardous gas PH3. According to the preparation method, low-cost natural halloysite nano-tubes (HNTs) are used as a carrier, tetrabutyl titanate, nickel chloride, ferric chloride and ferrous sulfate are used as precursors, nano-titania (TiO2) is synthesized on the surface of the carrier in anin-situ manner, and ammoniation, impregnation, drying, calcination, hydrogen reduction and other steps are performed to generate the metal nickel (Ni) and triiron tetraoxide (Fe3O4) catalytically active center on the surface of the composite carrier. According to the present invention, the reactions of the preparation method are easily performed, the uniformity at the molecular level can be obtained within a short time, the process is simple, and the efficiency of the catalytic decomposition of PH3 can be enhanced by introducing the photocatalytic material.

Description

technical field [0001] The invention relates to photocatalytic decomposition of toxic and harmful gas PH 3 The preparation of catalysts, especially a composite material with good photocatalytic activity as a carrier and an efficient catalytic decomposition of PH with efficient and cheap transition metals and metal oxides as active centers 3 Catalyst preparation method. Background technique [0002] Phosphine (PH 3 ) is a strong reducing gas with foul smell, colorless, highly toxic, flammable and carcinogenic. It is mainly produced in chemical production processes such as yellow phosphorus production, calcium carbide production, magnesium powder production, and sodium hypophosphite production. 3 If the exhaust gas is directly discharged into the atmosphere without treatment, it will cause a series of serious environmental problems such as air pollution, ecological damage, and human health damage. Traditional PH 3 Exhaust gas purification methods include combustion method,...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01D53/86
CPCB01J27/24B01D53/86B01D2255/802B01D2257/553
Inventor 不公告发明人
Owner 天津格林凯恩化工科技有限公司
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