Preparation method of mesoporous silicon oxide-based silver catalyst and application thereof in carbon monoxide oxidation

A catalyst and mesoporous technology, applied in the field of inorganic nano-catalytic materials, can solve the problems such as the unsatisfactory CO oxidation and purification effect, achieve good industrial application prospects, convenient operation, simple preparation process and equipment

Inactive Publication Date: 2012-01-04
DALIAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Silver is relatively cheap, but it is not very effective for CO oxidation purification

Method used

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  • Preparation method of mesoporous silicon oxide-based silver catalyst and application thereof in carbon monoxide oxidation
  • Preparation method of mesoporous silicon oxide-based silver catalyst and application thereof in carbon monoxide oxidation
  • Preparation method of mesoporous silicon oxide-based silver catalyst and application thereof in carbon monoxide oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 1.25g of dodecylamine to 10ml of absolute ethanol, stir in a water bath at 25°C, and completely dissolve the dodecylamine until a transparent solution is formed. Add 5ml tetraethyl orthosilicate to the solution, stir for 2h, then add 10ml deionized water to the solution, stir for 1h, then add 0.2ml formaldehyde solution to the solution, stir for 0.5h, then add 0.085g silver nitrate to the solution , The reaction was stirred continuously for 24h. Wash with deionized water, filter, dry in an oven at 100°C for 12h, and calcinate in a muffle furnace at 450°C for 4h in an air atmosphere to obtain Ag / SiO 2 catalyst. Its XRD, N 2 Adsorption-desorption and pore size distribution such as figure 1 , as shown in 2, 3.

[0027] The activity evaluation of the catalyst was carried out in a fixed-bed continuous flow differential reactor. The reactor was a glass U-shaped tube with an inner diameter of 4 mm. The catalyst loading was 200 mg. The feed gas composition: 1% CO (volum...

Embodiment 2

[0029] According to the preparation method of the present invention in Example 1, the order of reagent addition is changed, followed by silver nitrate, water, tetraethyl orthosilicate, and formaldehyde, see Catalytic Activity Figure 4 .

Embodiment 3

[0031] According to the preparation method of the present invention in Example 1, the order of adding reagents is changed, followed by formaldehyde, silver nitrate, water, and tetraethyl orthosilicate, and the catalytic activity is shown in Figure 4 .

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Abstract

The invention discloses a preparation method of a mesoporous SiO2-based Ag catalyst and application thereof in CO oxidation. The method is characterized by comprising the following steps: preparing an Ag / SiO2 catalyst by a one-step method by using lauryl amine as a template agent; dissolving the lauryl amine in absolute ethyl alcohol, vigorously stirring in a water bath kettle at a certain temperature to enable the lauryl amine to be completely dissolved; adding silicon sources, de-ionized water, formaldehyde and silver nitrate according to a certain ratio, sequence and time interval, continuing stirring for a period of time, washing with de-ionized water, leaching, drying, and calcining to obtain the Ag / SiO2 catalyst with a mesoporous structure; and using the Ag / SiO2 catalyst in a CO low-temperature catalytic oxidation reaction. The preparation method can prepare the Ag / SiO2 catalyst with a mesoporous structure and a high specific surface area, and the prepared Ag / SiO2 catalyst has high CO low-temperature oxidation catalysis activity and good application prospects.

Description

technical field [0001] The invention relates to a mesoporous SiO 2 The invention discloses an Ag-based catalyst and a preparation method thereof, and applies it to catalyze the low-temperature oxidation of CO, belonging to the field of inorganic nano-catalytic materials. Background technique [0002] CO is one of the main pollutants in the air of many industrial environments and indoor environments, especially in fierce battlefields, fire scenes, mine tunnels and other occasions, it is a deadly poison. Therefore, the elimination of CO has extremely important practical significance for the environment and industrial production, and catalytic oxidation is a simple, cheap and effective method. So far, people have mostly studied the use of noble metal catalysts such as Pt, Rh, and Au to catalyze CO oxidation. However, its wide application in industry is limited due to its high price and easy deactivation. [0003] Silver is relatively cheap, but it is not very effective for C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01D53/86B01D53/62
CPCY02A50/20
Inventor 曲振平张晓东贾静璇李新勇
Owner DALIAN UNIV OF TECH
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