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Nanogold-loaded meso-porous silicon material catalyst for formaldehyde room temperature oxidation, preparation and activation method and application

An activation method and mesoporous silicon technology, applied in chemical instruments and methods, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of poor activity and stability at room temperature, and achieve the reduction of precious metal consumption, good repeatability, process and The effect of simple equipment

Active Publication Date: 2017-11-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem of Au / SiO in the existing HCHO catalytic oxidation reaction 2 Due to the shortcomings of poor room temperature activity and stability in the catalyst system, the present invention provides for the first time a method for preparing and activating a mesoporous silicon material-loaded nano-gold catalyst for catalytic purification of formaldehyde, which can be used for low-concentration indoor formaldehyde purification.

Method used

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  • Nanogold-loaded meso-porous silicon material catalyst for formaldehyde room temperature oxidation, preparation and activation method and application
  • Nanogold-loaded meso-porous silicon material catalyst for formaldehyde room temperature oxidation, preparation and activation method and application
  • Nanogold-loaded meso-porous silicon material catalyst for formaldehyde room temperature oxidation, preparation and activation method and application

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Experimental program
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Effect test

Embodiment 1

[0025] Disperse 2.0g of MCM-41 carrier material into 200mL of ethanol, then add 10.0g of APTES to the solution, and stir and reflux at 80°C for 24h to obtain a white emulsion, which is filtered by ethanol, washed twice, and dried in an oven at 80°C for 6h , to obtain APTES-modified MCM-41 material, denoted as APTES@MCM-41.

Embodiment 2

[0027] Weigh 1.0g of APTES@MCM-41 obtained in Example 1 and disperse it into 40mL of deionized water in turn, add 2.1mL of prepared HAuCl 4 solution, after stirring at room temperature for 30min, add 10mL of 0.2M NaBH 4 solution, the color of the solution quickly changed to reddish brown, and continued to stir at room temperature for 30 minutes, filtered and washed with water three times to obtain Au / APTES@MCM-41 with a mass fraction of 1%. The catalyst samples were dried in an oven at 80 °C. The obtained Au / APTES@MCM-41 catalyst was pressed into tablets and passed through a 20-40 mesh sieve to obtain a mesoporous silicon-supported nano-gold catalyst.

Embodiment 3

[0029] Weigh 0.2g of the catalyst and put it into a quartz reaction tube, inject Ar gas for 15 minutes to remove the air in the pipeline, and then inject H 2 (30ml / min), treated at 600°C for 1h, the heating rate was 10°C / min; Ar purged to cool down to room temperature. The initial concentration of formaldehyde is 120ppm, and the reaction temperature is 25°C, and the conversion rate of formaldehyde is 9%.

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Abstract

The invention discloses a nanogold-loaded meso-porous silicon material catalyst for formaldehyde room temperature oxidation, a preparation and activation method and an application, and belongs to the technical field of the indoor environment catalytic purification. The preparation method for the catalyst comprises the following steps: decorating by a silane coupling agent, using an chloroauric acid as a precursor, and using a liquid-phase reduction method to obtain the nanogold-loaded meso-porous silicon material catalyst. The catalyst prepared by the method is applied to the room temperature catalytic formaldehyde reaction, and has the characteristics of high specific surface area, abundant pore structure, higher room temperature activity, and better stability. The product is carbon dioxide and water. The catalyst is suitable for an indoor low-concentration formaldehyde catalytic purification device, and has the extensive practical application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalytic purification applied to indoor environments, and relates to a preparation method of a mesoporous silicon material-loaded nano-gold catalyst and an application of activation in catalytic oxidation reaction of formaldehyde at room temperature. Background technique [0002] Formaldehyde (HCHO), also known as formaldehyde, as an important chemical raw material, is widely used in interior building decoration materials, textile industry and other fields. However, formaldehyde can seriously pollute indoor air quality and endanger human health. It is a well-known volatile organic pollutant (VOCs) with strong triple effects. The national standard stipulates that the concentration of formaldehyde shall not exceed 0.1mg / m 3 ("Indoor Air Quality Standard"). Therefore, it is of great practical significance to study the elimination of formaldehyde in indoor air. The common formaldehyde removal technologies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01D53/86B01D53/72
CPCB01D53/8668B01D2255/106B01D2255/50B01D2257/708B01J29/0325
Inventor 曲振平徐婧王奕
Owner DALIAN UNIV OF TECH
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