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A kind of mesoporous catalyst for degrading formaldehyde and preparation method thereof

A formaldehyde mesoporous catalyst technology, applied in the field of mesoporous composite catalysts and its preparation, can solve the problems of low catalytic degradation efficiency of formaldehyde at room temperature, catalyst deactivation, etc., to increase catalytic oxidation reaction activity, high specific surface area, and improve catalytic degradation efficiency effect

Active Publication Date: 2019-02-22
GUANGZHOU YEZI ENVIRONMENT PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, semiconductor photocatalysts need to be excited by light sources to function effectively, and catalyst deactivation is prone to occur during the reaction process. At the same time, the removal of formaldehyde by semiconductor catalysts is also limited by the adsorption on nano-TiO 2 The amount of formaldehyde on the surface of the particles, resulting in a relatively low catalytic degradation efficiency of semiconductor photocatalysts for formaldehyde at room temperature

Method used

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  • A kind of mesoporous catalyst for degrading formaldehyde and preparation method thereof
  • A kind of mesoporous catalyst for degrading formaldehyde and preparation method thereof
  • A kind of mesoporous catalyst for degrading formaldehyde and preparation method thereof

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preparation example Construction

[0038] A preparation method for degrading formaldehyde mesoporous catalyst, it comprises steps:

[0039] S100 prepares the mesoporous matrix material, mixes the carbon source in the template agent, adds the silicon source aqueous solution and the pore-enlarging agent at intervals to carry out the stirring reaction, and then obtains the synthetic product after hydrothermal reaction, and calcines and carbonizes the synthetic product to obtain Ordered mesoporous C-SiO 2 nanospheres;

[0040] S200 Preparation of SiW 9 Ru 4 / C-SiO 2 , Dissolve ruthenium trichloride and silicotungstate in water, adjust the pH to 4.5-5.5, maintain the pH value by adjusting the water bath reaction, add C-SiO 2 Nanospheres in the reaction solution, after ultrasonic dispersion, add potassium chloride to the reaction solution under vigorous stirring, stir, filter, and dry to obtain SiW 9 Ru 4 / C-SiO 2 composite materials; and

[0041] S300 Preparation of Pd-SiW 9 Ru 4 / C-SiO 2 Composite materi...

Embodiment 1

[0069] (1) Preparation of matrix mesoporous material C-SiO 2 . Weigh 0.6g of phenol, melt it completely at 50°C, and transfer it into a round bottom flask, then add 15ml of 0.1mol / L sodium hydroxide solution into the flask, stir for 10min at a speed of 400r / min and mix well; then add Take 2.1ml of 37% formaldehyde solution and raise the temperature to 70°C, keep the temperature for 30 minutes to obtain the low molecular weight phenolic resin (Mw2 nanospheres. Among them, the SiO in the mesoporous matrix 2 The mass fraction is 12%, the pore diameter of the mesoporous matrix is ​​concentrated at 4.0nm, and the pore volume is 0.4cm 3 / g, the specific surface area is 745m 2 / g.

[0070] (2) Preparation of SiW 9Ru 4 / C-SiO 2 . First, weigh 0.27g of RuCl 3 ·3H 2 O was dissolved in 25ml of deionized water, stirred and dissolved evenly at room temperature, and then weighed 1g of α-Na 10 [SiW 9 o 34 ]·15H 2 O solid was slowly added to the above solution under vigorous sti...

Embodiment 2

[0072] (1) Preparation of matrix mesoporous material C-SiO 2 . Weigh 0.6g of phenol, melt it completely at 50°C, and transfer it into a round bottom flask, then add 15ml of 0.1mol / L sodium hydroxide solution into the flask, stir for 10min at a speed of 400r / min and mix well; then add Take 2.1ml of 37% formaldehyde solution, heat up to 70°C, keep the temperature for 30 minutes to obtain low molecular weight phenolic resin (Mw2 nanospheres. SiO in mesoporous materials 2 The mass fraction is 12%, the pore size of the material is concentrated at 4.0nm, and the pore volume is 0.4cm 3 / g, the specific surface area is 745m 2 / g.

[0073] (2) Preparation of SiW 9 Ru 4 / C-SiO 2 . First, weigh 0.27g of RuCl 3 ·3H 2 O was dissolved in 25ml of deionized water, stirred and dissolved evenly at room temperature, and then weighed 1g of α-Na 10 [SiW 9 o 34 ]·15H 2 O solid was slowly added to the above solution under vigorous stirring, and the addition time lasted for 1 hour; then...

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Abstract

The invention provides a formaldehyde-degraded mesoporous catalyst and a preparation method thereof. The catalyst mainly consists of a mesoporous matrix with a mass fraction of 58% to 75% and 23% to 40% SiW. 9 Ru 4 It is composed of polyoxometalates and 1% to 3% nanopalladium particles, in which the mesoporous matrix is ​​ordered mesoporous carbon-silica nanospheres. As a result, the formaldehyde mesoporous catalyst has the ability to adsorb formaldehyde and can efficiently catalyze the degradation of formaldehyde at room temperature without the need for additional photocatalytic treatment, effectively improving the air purification power of formaldehyde.

Description

technical field [0001] The invention relates to the field of air purification materials, in particular to a mesoporous composite catalyst suitable for adsorbing formaldehyde gas and performing catalytic degradation and a preparation method thereof. Background technique [0002] In recent years, a large amount of toxic and harmful gases such as formaldehyde have been contained in newly renovated rooms and cars. The interior space of these places is small. If they are kept in a closed state for a long time, it is easy to cause symptoms such as headache, fatigue, skin itching, and difficulty breathing. Neurotoxicity, cancer and even death. The serious harm of formaldehyde to human health has increasingly become the focus of people's attention. The traditional method of removing harmful formaldehyde gas indoors and in cars is generally through ventilation, using activated carbon adsorption and other methods to remove it, but this method does not really decompose formaldehyde ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652B01J35/10B01D53/72B01D53/86
CPCB01D53/8668B01J23/6527B01D2258/06B01D2257/70B01J35/617B01J35/633B01J35/647
Inventor 王文群
Owner GUANGZHOU YEZI ENVIRONMENT PROTECTION TECH CO LTD
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