Method for applying gold hydroxyapatite loaded catalyst to catalytic oxidation reaction of formaldehyde at room temperature

A technology of gold hydroxyapatite and hydroxyapatite, which is applied in the field of supported gold hydroxyapatite catalysts, can solve the problems of complicated operation, difficult regeneration, and fast failure of composite technology, and achieves the effect of broad application prospects.

Inactive Publication Date: 2014-04-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to overcome the shortcomings of the existing adsorption technology, such as rapid failure, difficult regeneration and cumbersome operation of the composite technology

Method used

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  • Method for applying gold hydroxyapatite loaded catalyst to catalytic oxidation reaction of formaldehyde at room temperature
  • Method for applying gold hydroxyapatite loaded catalyst to catalytic oxidation reaction of formaldehyde at room temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0015] (1) Dissolve 12.6g of calcium nitrate hydrate in a mixed solution with 60ml of water and 60ml of absolute ethanol, dissolve 4.2g of diamine hydrogen phosphate in 120ml of water to form solutions X and Y respectively, and gradually drop the Y solution at room temperature Add it to the X solution, and finally form a milky white precipitate, then adjust the pH value to 10 with ammonia water, and magnetically stir overnight in a water bath at 80°C. Medium roasting for 5h to finally obtain the HAP carrier;

[0016] (2) Add 0.022g HAuCl 4 , 0.4g urea and 10g HAP were dissolved in 500ml of deionized water, stirred at 80°C for 8h in the dark, then aged for 12h at room temperature, washed by suction filtration (centrifugal separation) to remove Cl - ions, the obtained sample was dried at 80°C for 16h, and then calcined at 200°C for 4h to obtain a 0.1%Au / HAP catalyst.

[0017] (3) Catalytic oxidation to remove formaldehyde is carried out in a quartz tube fixed-bed reactor with ...

Embodiment 2

[0019] Process is identical with embodiment 1, difference is to take by weighing 0.11g HAuCl 4 0.5%Au / HAP catalyst was prepared with 2g urea, the reaction temperature was 20°C, and the initial concentration of formaldehyde was 100ppm. Under these conditions, the conversion rate of formaldehyde was 95%.

Embodiment 3

[0021] Process is identical with embodiment 1, difference is to take by weighing 0.22g HAuCl 4 1%Au / HAP catalyst was prepared with 4g urea, the reaction temperature was 10℃, and the initial concentration of formaldehyde was 300ppm. Under these conditions, the conversion rate of formaldehyde was 100%.

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Abstract

The invention relates to a method for applying a gold hydroxyapatite loaded catalyst to catalytic oxidation reaction of formaldehyde at room temperature, belonging to the technical field of indoor air purification. The method is characterized by comprising the following steps: by taking calcium nitrate and diammonium hydrogen phosphate as precursors, obtaining hydroxyapatite by a liquid deposition method; by taking chloroauric acid as a precursor and the hydroxyapatite as a carrier, preparing the gold hydroxyapatite loaded catalyst by an urea homogeneous precipitation method, wherein the percentage by weight of Au is 0.1%-10%; and carrying out the reaction of removing formaldehyde by catalytic oxidation in a reactor, and passing formaldehyde gas through a gold hydroxyapatite loaded catalyst bed layer, wherein the reaction temperature is ranged from -15 DEG C to 25 DEG C. The method provided by the invention has the beneficial effects that formaldehyde pollutants are oxidized to CO2 and H2O at room temperature without complex operations such as temperature rising and heating. The method satisfies the actual using demands on indoor air purification, and has a wide application prospect in the field of indoor air pollutant purification.

Description

technical field [0001] The invention belongs to the technical field of indoor air purification, and relates to a method for applying a loaded gold hydroxyapatite catalyst in the catalytic oxidation reaction of formaldehyde at room temperature. technical background [0002] Formaldehyde is the simplest aliphatic aldehyde, which was first produced by the Russian chemist A.M. Butlerov in 1859 through the hydrolysis of methylene diethyl ester. In contemporary society, formaldehyde has become one of the most important organic chemical raw materials, especially for various building decoration materials. However, as a highly toxic substance, formaldehyde also brings great harm to human beings while being widely used. The World Health Organization (WTO) stipulates the threshold value of formaldehyde to stimulate various physiological functions of the human body, and points out that when the indoor concentration of formaldehyde exceeds the standard of 0.06ppm, it may cause health pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18B01D53/86B01D53/72
Inventor 石川王钰陈冰冰朱爱民
Owner DALIAN UNIV OF TECH
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