Au nano catalyst for exhaust purification of internal-combustion engine and preparation method thereof

A nano-catalyst and exhaust gas purification technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. The effect of sustainable development, improved catalytic activity, high specific surface area

Inactive Publication Date: 2012-12-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the existing Au nanocatalysts is relatively large, resulting in low activity of the Au nanocatalysts, which cannot meet the needs of internal combustion engine exhaust purification. Therefore, it is necessary to further improve the manufacturing process of Au nanocatalysts and study new Au nanocatalysts. manufacturing method to reduce the particle size of Au nanocatalyst and improve its catalytic activity, so that it can be widely used in automobile emission purification devices and become a substitute for noble metals such as Pt, Pd and Rh

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  • Au nano catalyst for exhaust purification of internal-combustion engine and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] In this embodiment, the test sample of the exhaust gas purification catalyst for an internal combustion engine selects a quartz flake with silicon dioxide as the main component as the base material prepared by the Au nanocatalyst. Silica is a common carrier material for exhaust gas purification catalysts for internal combustion engines. Au nanocatalysts supported on ZnO nanowires were prepared by vapor deposition method based on VLS mechanism on a quartz substrate with silica as the main component. The raw materials used are as follows:

[0026] ZnO powder: purity: 99.95%, particle size: 10~100nm;

[0027] Graphite powder: fixed carbon purity: 90~99.9%, specification: 100~2000 mesh;

[0028] Quartz sheet sample: silica content: 99.9%, specifications: length × width × height: 20 × 70 × 3mm;

[0029] Au: purity 99.9%.

[0030] The specific preparation steps are as follows:

[0031] Step 1, using the magnetron sputtering technology to prepare an Au nanoparticle lattic...

Embodiment 2

[0038] Same as Example 1, with the following differences:

[0039] In step (3), the distance between the two heating tanks is set to 10cm; the gas flow rate is 40ml / min;

[0040] In step (4), the temperature of the upstream tubular heating furnace 1 is controlled at 1150°C, and the temperature of the downstream tubular heating furnace 2 is controlled at 950°C;

[0041] The reaction time in step (5) is 120 minutes.

[0042] Using scanning electron microscope (SEM) observation, the Au nanocatalyst particles are very small and uniform in size, with a particle size between 5 and 10 nm, and the diameter of the ZnO nanowires grown under its catalytic induction is between 10 and 50 nm.

[0043] The catalytic performance of the catalyst was tested by the same method as in Example 1, and the catalytic performance of the Au nanocatalyst was tested by using propane and carbon monoxide with a concentration of 1000 ppm respectively as the sample gas. The experimental results show that fo...

Embodiment 3

[0045] Same as Example 1, with the following differences:

[0046] In step (3), the distance between the two heating tanks is set to 8cm; the gas flow rate is 50ml / min;

[0047] In step (4), the temperature of the upstream tubular heating furnace 1 is controlled at 1100°C, and the temperature of the downstream tubular heating furnace 2 is controlled at 1000°C;

[0048] The reaction time in step (5) is 100 minutes.

[0049] Using scanning electron microscope (SEM) observation, the Au nanocatalyst particles are very small and uniform in size, with a particle size between 5 and 10 nm, and the diameter of the ZnO nanowires grown under its catalytic induction is between 10 and 50 nm.

[0050] The catalytic performance of the catalyst was tested by the same method as in Example 1, and the catalytic performance of the Au nanocatalyst was tested by using propane and carbon monoxide with a concentration of 1000 ppm respectively as the sample gas. The experimental results show that fo...

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Abstract

The invention discloses an Au nano catalyst for exhaust purification of an internal-combustion engine and a preparation method thereof, and belongs to the technical fields of automobile emission control and environmental protection. The catalyst uses a metal oxide nanowire as a carrier, precipitates on the top end of the carrier in a way of Au nanoparticles, and has a particle diameter of 5-10 nm. A vapor deposition method employing a vapor-liquid-solid mechanism is used to prepare the Au nano catalyst. The method comprises the following steps: (1) preparing Au nano lattices on a quartz substrate by a magnetron sputtering technology; (2) mixing a graphite powder and a metal oxide powder; (3) designing a double-heating tank chemical vapor deposition system, and introducing inert gas; (4) controlling the temperature of a pipe-type heating furnace; and (5) controlling a reaction time. The catalyst has high low-temperature catalytic activity and can replace noble metals such as Pt, Pd and Rh to be used in the field of exhaust purification of internal-combustion engine.

Description

technical field [0001] The invention relates to an Au nano-catalyst for purifying exhaust gas of an internal combustion engine and a preparation method thereof, belonging to the technical field of vehicle emission control and environmental protection. Background technique [0002] With the increase in the number of automobiles worldwide, the pollution of the atmospheric environment caused by the pollutants emitted by automobiles has received unprecedented attention, and the emission control standards of automobiles in various countries in the world have gradually increased. Under the current technical background, it has become more and more difficult to meet emission regulations simply by improving the working process of the internal combustion engine, so various exhaust aftertreatment technologies and devices have emerged as the times require. At present, the main active components of catalysts used in exhaust purification of internal combustion engines are precious metals ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J23/52B01J35/10B01D53/62B01D53/72B01D53/94
Inventor 郝利君葛蕴珊朱辉谭建伟韩秀坤高力平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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