Au/TiO2 catalyst for eliminating ozone by photocatalysis

A catalyst and photocatalysis technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve the problems of unstable service life, complex preparation, and poor purification effect of catalysts Ideal and other issues

Inactive Publication Date: 2007-07-04
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used ozone decomposition method is mainly thermal catalytic method, such as the Chinese patent CN1259398A application discloses a method based on MnO 2 Manganese catalyst with nickel or copper or cobalt oxide as the main agent and activated carbon as the carrier has the defect that the service life of the catalyst is not stable enough
In addition, Chinese patents CN1316300A and CN 1375348A disclose a catalyst, which is prepared by mixing manganese nitrate, iron nitrate, nickel nitrate, silver nitrate, palladium nitrate, etc. as precursors. The above three patents The preparation is more complicated, and they are all used for the thermocatalytic decomposition of ozone. The thermocatalytic decomposition is generally carried out on a fixed reaction bed, and the device is more complicated.
Moreover, the indoor ozone concentration is low, and the air flow rate in the air purification device is relatively large, so the purification effect of the above catalysts is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, weighing TiO 2 , 1.000g, roasted in air at 400℃ for 4h, added 10ml H 2 O, dispersed evenly. Adjust pH=7 with 1M NaOH solution, add 1.6ml, 6.26mg / ml (Au content) of HAuCl dropwise 4 solution. Adjust pH=7 with 1M NaOH solution, stir properly, and react at 40°C for 2h. Filtered, washed until no detectable Cl -1 , Vacuum drying l5h. Finally, it was calcined at 200°C for 4 hours in the air to obtain the finished catalyst. The yield is 97.8%.

[0018] Take 25mg of the catalyst, make it into a suspension solution with a certain concentration, and roughen the surface to 1.0×11cm 2 The thin glass piece is immersed in the suspended aqueous solution, dip-coated several times, and dried to obtain the glass sample piece loaded with the catalyst. A flat quartz tube was used as the reactor, and a thin glass sheet loaded with the catalyst was put in. Two 4w black light lamps (peak value λ=365nm, hυ=3.40eV) were placed on both sides of the reactor respectively. Th...

Embodiment 2

[0020] Embodiment 2, weighing TiO 2 , 1.000g, roasted in air at 470℃ for 4.5h, added 10ml H 2 O, dispersed evenly. Use 1M NaOH solution to adjust pH=7.6, add dropwise; dissolve 0.1g of Au in 100ml of aqua regia, take 23ml and dilute to 100ml to obtain 4.35mg / ml (Au content) of HAuCl 4 solution, take 2.30ml of the solution and add it dropwise to TiO 2 In the suspension, the pH was adjusted to 7.5 with 1M NaOH solution, stirred properly, and reacted at 46° C. for 2 h. Filtered, washed until no detectable Cl -1 , vacuum dried for 20h. Finally, it was calcined at 220°C for 4 hours in the air to obtain the finished catalyst. The yield is 97.8%.

[0021] Under the test conditions for eliminating ozone in Example 1, the photocatalytic elimination rate of ozone was 99.1%.

Embodiment 3

[0022] Embodiment 3, weighing TiO 2 , 1.000g, roasted in air at 500℃ for 5h, added 10ml H 2 O, dispersed evenly. Adjust pH=8 with 1M NaOH solution, add 1.2ml, 4.28mg / ml (Au content) of AuCl dropwise 3 solution. Adjust pH=8 with 1M NaOH solution, stir properly, and react at 50° C. for 3 h. Filtered, washed until no detectable Cl -1 , vacuum dried for 24h. Finally, it was calcined at 250°C for 4 hours in the air to obtain the finished catalyst. Yield 97.7%.

[0023] Under the test conditions for eliminating ozone in Example 1, the photocatalytic elimination rate of ozone was 87%.

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Abstract

The invention relates to a kind of catalyst that can eliminate ozone, especially photocatalytic eliminate ozone catalyst. Au is the active component of the catalyst, activity carrier is the TiO2, the mass ratio of the gold and titanium dioxide is 1:100-1: 200, the TiO2 activity carrier is powder, the average size is 5-50nm, TiO2 crystal is anatase, rutile, plate perovskite or mixed crystal. This catalyst has good performance for photocatalytic eliminate ozone, the carrier that requirements are simple, less the amount of catalyst, especially used in indoor air purification means for elimination of ozone, and the preparation is simple, cost is greatly reduced, suitable for industrial production.

Description

technical field [0001] The invention relates to a catalyst for eliminating ozone, in particular to a photocatalytic catalyst for eliminating ozone. technical background [0002] Ozone is a beneficial substance in the top layer of the atmosphere, but near the ground, the strong oxidizing ozone has caused great harm to human beings and their survival. Ozone is widely used in modern industry and daily life, which causes a large amount of ozone waste gas to be discharged into the air. my country's indoor environmental quality standards stipulate that the maximum concentration of ozone allowed indoors should be lower than 0.16mg / m 3 . Therefore, it is very important to decompose the ozone in the exhaust gas and decompose it into harmless substances. [0003] At present, the commonly used ozone decomposition method is mainly thermal catalytic method, such as the Chinese patent CN1259398A application discloses a method based on MnO 2 A manganese catalyst with nickel or copper or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J37/03B01D53/66
CPCY02A50/20
Inventor 杨建军贺攀科张敏王晓辉杨冬梅金振声
Owner HENAN UNIVERSITY
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