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Gold catalyst removing carbon monoxide, formaldehyde and ethylene and preparation and application

A carbon monoxide and gold catalyst technology, applied in the field of air purification, can solve the problems of poor reproducibility, difficult to control conditions, complicated processing process, etc., and achieve the effect of high utilization rate and wide range of carrier selection.

Active Publication Date: 2013-09-18
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the deposition precipitation method is that the conditions are not easy to control, and the reproducibility is often poor. A considerable part of the gold nucleates and grows in the solution instead of depositing on the surface of the carrier.
[0007] Co-precipitation and deposition-precipitation methods generally require roasting the sample under a certain atmosphere and temperature, or undergoing reduction treatment to achieve catalyst activation, and the treatment process is relatively complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 50 mL HAuCl 4 The solution (the concentration of gold is 0.25 mg / mL) was placed in a stoppered Erlenmeyer flask, and then 0.5 g Fe 2 o 3 , shake continuously on a shaker at room temperature for 21 hours, centrifuge, wash the solid with pure water until there is no residual chloride ion, and then dry it at 100°C to obtain the catalyst Au / Fe 2 o 3 .

[0029] At an airspeed of 6000 h -1 , the volume concentration of CO is 1%, and the equilibrium gas is air, the Au / Fe 2 o 3 The conversion rate of the catalyst to CO is 100% at 25°C, and over 80% at -20°C; at a space velocity of 6000 h -1 , the concentration of formaldehyde is 100 ppm, and the equilibrium gas is air, the Au / Fe 2 o 3 The conversion rate of the catalyst to formaldehyde is over 85% at 25°C; at a space velocity of 6000 h -1 , the ethylene concentration is 5 ppm, and the equilibrium gas is air, the Au / Fe 2 o 3 The conversion rate of the catalyst to ethylene is over 80% at 5°C.

Embodiment 2

[0031] 50 mL HAuCl 4 The solution (the concentration of gold is 0.7 mg / mL) was placed in a stoppered Erlenmeyer flask, and then 0.5 g Fe(OH) was added 3 , shake on a shaker at room temperature or stir on a magnetic stirrer for 40 hours, centrifuge, wash the solid with pure water until there is no residual chloride ion, and then dry it at 100 ° C to obtain the catalyst Au / Fe(OH) 3 .

[0032] At an airspeed of 6000 h -1 , the volume concentration of CO is 1%, and the equilibrium gas is air, the Au / Fe(OH) 3 The conversion rate of the catalyst to CO is 100% at 25°C, and over 90% at -20°C; at a space velocity of 6000 h -1 , the concentration of formaldehyde is 100 ppm, and the equilibrium gas is air, Au / Fe(OH) 3 The conversion rate of the catalyst to formaldehyde is over 90% at 25°C; at a space velocity of 6000 h -1 , the concentration of ethylene is 5 ppm, and the equilibrium gas is air, Au / Fe(OH) 3 The conversion rate of the catalyst to ethylene is over 80% at 5°C.

Embodiment 3

[0034] 50 mL HAuCl 4 The solution (the concentration of gold is 0.4 mg / mL) was placed in a stoppered Erlenmeyer flask, and then 0.5 g Co 3 o 4 , shake on a shaker at room temperature or stir on a magnetic stirrer for 5 hours, centrifuge, wash the solid with pure water until there is no residual chloride ion, and then dry it at 100 ° C to obtain the catalyst Au / Co 3 o 4 .

[0035] At an airspeed of 6000 h -1 , the volume concentration of CO is 1%, and the equilibrium gas is air, the Au / Co 3 o 4 The conversion rate of the catalyst to CO is 100% at 25°C, and over 90% at -20°C; at a space velocity of 6000 h -1 , the concentration of formaldehyde is 100ppm, and the equilibrium gas is air, the Au / Co 3 o 4 The conversion rate of the catalyst to formaldehyde is over 90% at 25°C; at a space velocity of 6000 h -1 , the ethylene concentration is 5 ppm, and the equilibrium gas is air, the Au / Co 3 o 4 The catalyst has a 100% conversion of ethylene at 5°C.

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PUM

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Abstract

The invention discloses a gold catalyst removing carbon monoxide, formaldehyde and ethylene and preparation and application, and belongs to the field of air purification. The preparation method of the gold catalyst removing carbon monoxide, formaldehyde and ethylene comprises the following steps: adding a metallic oxide or hydroxide into a chloroauric acid liquor; stirring or shaking; centrifugalizing; washing solids till no residual chloridions exist; and drying to obtain the gold catalyst removing carbon monoxide, formaldehyde and ethylene. According to the preparation method provided by the invention, as no precipitators are additionally added and the pH is not controlled and the temperature of the system is not raised, gold is absorbed on the surface of a metallic oxide or hydroxide carrier, so that the utilization ratio is high and the carrier selective range is wide. The gold catalyst prepared by the method disclosed by the invention has high catalytic oxidative activity to carbon monoxide, formaldehyde and ethylene, so that the gold catalyst can be applied to air purification.

Description

[0001] technical field [0002] The invention belongs to the technical field of air purification, and relates to a gold catalyst for removing carbon monoxide, formaldehyde and ethylene, as well as its preparation and application. Background technique [0003] Pollutants such as carbon monoxide and formaldehyde in indoor air have a great negative impact on human health. Catalytic oxidation of carbon monoxide and formaldehyde at low and normal temperatures using high-efficiency catalysts is a commonly used air purification method. In addition, in the cold storage used to keep vegetables and fruits fresh, the trace ethylene gas produced by vegetables and fruits often has a ripening effect on themselves and promotes their spoilage. The use of high-efficiency low-temperature catalysts to oxidize ethylene into carbon dioxide and water can improve freshness. Effect. [0004] Studies have shown that gold catalysts have good low-temperature catalytic oxidation activity for carbon...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/52B01J23/68B01J23/66B01D53/86B01D53/62B01D53/72
CPCY02A50/20
Inventor 李进军汤峥郭慧珊张维东李仪黄祖螟程微吴峰
Owner WUHAN UNIV
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