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Nano-silver catalyst used for CO oxidation at normal temperature and preparation method thereof

A room temperature oxidation and catalyst technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of uneven distribution of active species and achieve good industrial applications Promising, repeatable, low-cost results

Inactive Publication Date: 2012-02-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven distribution of active species in the scale-up preparation of the one-step synthesis catalyst, it has its limitations in industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] SiO 2 Preparation of the carrier: Add 1.25 g of dodecylamine to 10 ml 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 and 10ml deionized water to the solution, and keep stirring 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 8h in an air atmosphere to obtain SiO 2 carrier.

[0018] Ag / SiO 2 Catalyst preparation: weigh 1g SiO 2 Dissolve the carrier in 5ml of water, add 0.063g of silver nitrate under stirring, continue to stir for 1h, let stand for 12h, and dry in an oven at 100°C for 12h to prepare 4wt%Ag / SiO 2 catalyst.

[0019] 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 (vol...

Embodiment 2

[0021] SiO according to the invention of Example 1 2 Preparation method, add 3.6ml methyl orthosilicate instead of ethyl orthosilicate. The evaluation method of the catalyst is the same as in Example 1. Activity tests show that the 4wt%Ag / SiO prepared by this method 2 The catalyst can completely oxidize CO at room temperature, and the activity of the catalyst remains unchanged after 48 hours of use.

Embodiment 3

[0023] SiO according to the invention of Example 1 2 Preparation method, adopt 1.8g octadecylamine instead of dodecylamine. The evaluation method of the catalyst is the same as in Example 1. Activity tests show that the 4wt%Ag / SiO prepared by this method 2 The catalyst can completely oxidize CO at room temperature, and the activity of the catalyst remains unchanged after 48 hours of use.

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Abstract

The invention discloses a nano-silver catalyst used for CO oxidation at room temperature and a preparation method thereof. The catalyst comprises silver as a catalytic active component and SiO2 as a carrier. The catalyst is prepared by two steps of: preparing the SiO2 carrier by adopting a template method; and then preparing an Ag / SiO2 catalyst by adopting an impregnation method by taking SiO2 as the carrier. The SiO2 prepared in the invention has high specific surface area, and the catalyst has better stability, can be used for catalyzing CO to be completely converted at room temperature, has the activity basically unchanged after being used for 48h, and has a wide industrial application prospect.

Description

technical field [0001] The present invention relates to a kind of support type nano-silver catalyst that can oxidize CO under normal temperature and preparation method thereof, specifically relate to take silver as active component, SiO 2 As a supported catalyst, the catalyst can catalyze the CO oxidation reaction at room temperature, and has good stability. The invention belongs to the field of inorganic nano catalytic materials. Background technique [0002] With the development of modern industry, environmental pollution is becoming more and more serious, and the prevention of environmental pollution has become a major issue related to the national economy and people's livelihood. [0003] In the 21st century, with the rapid development of the automobile industry, automobile exhaust pollution has become one of the main sources of air pollution, and CO is one of the main pollutants in automobile exhaust. For CO purification in underground motor vehicle passages, it is of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J35/10B01D53/62B01D53/60B01D53/72B01D53/86B01D53/94
CPCY02A50/20
Inventor 曲振平张晓东贾静璇
Owner DALIAN UNIV OF TECH
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