Highly dispersed metal catalysts

A catalyst and metal technology, applied in the field of highly dispersed metal catalysts, can solve the problems of expensive, expensive equipment, difficult to scale up, etc.

Inactive Publication Date: 2009-01-28
AGENCY FOR SCI TECH & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other methods involving cation adsorption or using organogold complexes are more expensive than the above methods
Sputtering and laser ablation methods can provide good control over Au particle size, but equipment can be very expensive and scale-up of production is difficult (see, Fan, L. et al., In Studies In Surface Science and Catalysis 132 (Iwasawa , Y. et al.) page 769)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1: the preparation of Au catalyst

[0068] Use HAuCl 4 As a precursor, NaBH 4 Au catalyst was prepared as reducing agent and amino acid as capping agent. During reduction, sonication (eg, 20 seconds) is used. Next, the catalyst was separated using centrifugation and washed with deionized water. The advantage of our method is the low reaction temperature and its adaptability to various catalyst supports. respectively for air and H 2 The catalytic activity of the catalyst for CO oxidation in the presence of , is comparable to the best state-of-the-art results.

[0069] Au / TiO 2 , Au / Fe 2 o 3 , Au / SiO 2 、(B)Au / CeO 2 、(C)Au / Al 2 o 3 , Pt / TiO 2 TEM images of the catalysts are shown in figure 2 , 3 , 4 and 10. The diameter of the Au colloid in the solution is 3-5nm ( figure 2 A). Deposited onto TiO 2 ( figure 2 B), or Fe 2 o 3 Or other catalyst supports, the size of the Au particles hardly changed. Moreover, these Au particles are highly...

Embodiment 2

[0070] Example 2: Activity comparison of the catalyst of the present invention with the best literature results

Table 1. Comparison of preparation conditions and preparation results of our catalyst with the best literature results

method

temperature

(℃)

Embodiment 3

[0071] Example 3: Oxidation of CO in air for mask application

[0072] CO in air on Au / TiO 2 on and at 1% Au / Fe 2 o 3 The oxidation on Figure 5 and Image 6 middle. For both catalysts, at room temperature and at high space velocity and for 1% Au / Fe 2 o 3 The catalyst can completely remove CO at 0°C. However, at -63°C, at 1% Au / Fe 2 o 3 The CO conversion on the above decreases from 100% to about 2.35% ( Image 6 B). Tests have shown that the life of the catalyst is at least greater than 200 hours. No further testing of stability was performed. 1%Au / TiO 2 and 1% Au / Fe 2 o 3 Both are suitable for use in masks and other breathing apparatus.

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Abstract

The present invention relates to a novel method for preparing a new type of catalyst for the oxidation of CO in a reactant gas or air. The method provides the preparation of a catalyst having nano-sized metal particles and a capping agent deposited on a solid support. The size and distribution of the metal particles can be easily controlled by adjusting reaction condition and the capping agent used. The catalyst prepared has high activity at low temperature toward selective oxidation of CO and is stable over an extended period of time. The catalyst can be used in air filter devices, hydrogen purification processes, automotive emission control devices (decomposition of NOx, x is the integer 1 or 2), F-T synthesis, preparation of fuel-cell electrode, photocatalysis and sensors.

Description

[0001] Cross References to Related Applications [0002] [001] This application claims priority to US Provisional Patent Application 60 / 736,259, filed November 14, 2005, which is hereby incorporated in its entirety for all purposes. Background of the invention [0002] Nanotechnology has had a huge impact on the materials, microelectronics, computing, pharmaceutical, medical, environmental, energy and chemical industries. Nanocatalysts are an important part of nanotechnology that has found increasing commercial applications. Suitable areas include pollution and emission control technologies such as de-pollution from vehicles, catalytic removal of volatile organic compounds (VOCs) from indoor environments, and cryogenic air purification. Applications include, for example, use of mask filters to burn CO at room temperature, chemical processing of many large and specialized chemicals, sensors to detect toxic or flammable gases or substances in solution, and emerging clean hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01D53/86B01J35/00
CPCB01D53/944B01J2231/70B01J31/06B01J23/42B01J35/0013B01J37/16B01J31/02B01D53/864B01J31/0237B01J23/52B01J31/04B01J23/8906B01D2255/106B01J31/065B01J35/006B01J35/393B01J35/23B01J35/00B01D53/86B01J23/40
Inventor 钟自仪林建义
Owner AGENCY FOR SCI TECH & RES
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